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77-508: The National Park Service has recognized the gap as a National Natural Landmark , as a site that provides an important illustration of the geological history of the United States. In southeastern Washington, Eastern Oregon , and southern Idaho , flood basalt flows of extremely fluid basaltic lava spread in all directions from long fissures, building broad fields of gently sloping lava that spread widely over great distances. Along

154-593: A catastrophic explanation of the geology, ran against the prevailing view of uniformitarianism , and Bretz's views were initially disregarded. The Geological Society of Washington, D.C , invited the young Bretz to present his previously published research at a January 12, 1927, meeting where several other geologists presented competing theories. Another geologist at the meeting, J.T. Pardee , had worked with Bretz and had evidence of an ancient glacial lake that lent credence to Bretz's theories. Bretz defended his theories, which kicked off an acrimonious 40-year debate over

231-515: A comment on the Komatsu analysis, Brian Atwater and colleagues observed substantial evidence for multiple large floods, including mud cracks and animal burrows in lower layers, which were filled by sediment from later floods. Further, evidence for multiple flood flows up sidearms of Glacial Lake Columbia spread over many centuries has been found. They also pointed out that the discharge point from Lake Columbia varied with time, originally flowing across

308-417: A historical baseline that read, "The goal of managing the national parks and monuments should be to preserve, or where necessary to recreate, the ecologic scene as viewed by the first European visitors." This baseline would guide ecological restoration in national parks until a climate change adaptation policy, "Resist-Adapt-Direct", was established in 2021. National Parks director Jonathan Jarvis charged

385-405: A magnificent park   ... A nation's Park, containing man and beast, in all the wild[ness] and freshness of their nature's beauty!" Yellowstone National Park was created as the first national park in the United States. In 1872, there was no state government to manage it (Wyoming was a U.S. territory at that time), so the federal government managed it directly through the army, including

462-674: A newly published topographic map of the Potholes Cataract . Bretz coined the term Channeled Scablands in 1923 to refer to the area near the Grand Coulee , where massive erosion had cut through basalt deposits. Bretz published a paper in 1923 arguing that the Channeled Scablands in Eastern Washington were caused by massive flooding in the distant past. Bretz's view, which was seen as arguing for

539-537: A person or event, though unlike a National Historical Site, may or may not be placed at a specific historical location. Several national memorials are on the National Mall , such as the Washington Monument and Lincoln Memorial . National seashores and national lakeshores offer preservation of the national coast line, while supporting water–based recreation. Cape Hatteras National Seashore

616-537: A special resource study of a site to determine its national significance and suitability to be part of the National Park System. The NPS uses over 20 different titles for the park units it manages, including national park and national monument . National parks preserve nationally and globally significant scenic areas and nature reserves. National monuments preserve a single unique cultural or natural feature. Devils Tower National Monument

693-475: A working fish trap if they would become his wives. They agreed, and Coyote kept his promise; however, over the years he became jealous of them. He changed two of the wives into these basalt pillars and turned the third into a cave downstream. He became a rock nearby so he could watch over them forever. This site is a popular hiking destination for avid hikers who want to view the geology of the Wallula Gap and

770-676: Is New Jersey Pinelands National Reserve at 1,164,025 acres (4711 km ). The smallest is Benjamin Franklin National Memorial at less than 0.01 acres (40 m ). While there are laws generally covering all units of the National Park System, they are subject to management policies of individual pieces of authorizing legislation or, in the case of national monuments created under the Antiquities Act , Executive Order . For example, because of provisions within their enabling legislation, Congaree National Park

847-521: Is Wrangell–St. Elias National Park and Preserve , Alaska. At 13,200,000 acres (53,000 km ), it is over 16 percent of the entire system. The smallest unit in the system is Thaddeus Kosciuszko National Memorial , Pennsylvania , at 0.02 acres (80 m ). In addition to administering its units and other properties, the NPS also provides technical and financial assistance to several affiliated areas authorized by Congress. The largest affiliated area

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924-491: Is almost entirely a wilderness area devoid of development, yet Yosemite allows unique developments such as the Badger Pass Ski Area and the O'Shaughnessy Dam within its boundaries. Such irregularities would not be found in other parks unless specifically provided for with exceptions by the legislation that created them. Most NPS units have been established by an act of Congress, with the president confirming

1001-523: Is charged with preserving the ecological and historical integrity of the places entrusted to its management and with making them available for public use and enjoyment. Artist George Catlin , during an 1832 trip to the Dakotas, was perhaps the first to suggest the concept of a national park. Indian civilization, wildlife, and wilderness were all in danger, wrote Catlin, unless they could be preserved "by some great protecting policy of government   ... in

1078-432: Is essential to a National Park Service that is science-informed at all organizational levels and able to respond with contemporary strategies for resource management and ultimately park stewardship." The "Revisiting Leopold" report mentioned climate change three times and "climate refugia" once, but it did not prescribe or offer any management tactics that could help parks managers with the problems of climate change. Hence,

1155-404: Is increasingly untenable, presenting practical and philosophical challenges for managers. As formerly familiar ecological conditions continue to change, bringing novelty, surprise, and uncertainty, natural resource managers require a new, shared approach to make conservation decisions.... The RAD (Resist-Accept-Direct) decision framework has emerged over the past decade as a simple tool that captures

1232-489: Is not a complicated site. National historical parks are larger areas with more complex subjects. Historic sites may also be protected in other unit types. National military parks , battlefield parks , battlefield sites , and battlefields preserve areas associated with military history. The different designations reflect the complexity of the event and the site. Many of the sites preserve important Revolutionary War battles and Civil War battlefields. Military parks are

1309-480: The Columbia River Basalt Group . During the basalt eruptions, the southern and western Columbia Plateau , which included the current location of the Wallula Gap, began to fold. The bending (or shear ) of the ancient lava flows is clearly visible in the folded layers of basalt exposed in the steep walls of the gap. Early in the history of folding, the ridge crest at Wallula Gap must have been

1386-739: The Columbia River Gorge at the end of the last ice age . These floods were the result of periodic sudden ruptures of the ice dam on the Clark Fork River that created Glacial Lake Missoula . After each ice dam rupture, the waters of the lake would rush down the Clark Fork and the Columbia River , flooding much of eastern Washington and the Willamette Valley in western Oregon . After the lake drained,

1463-665: The Hanford formation , has documented the presence of Middle and Early Pleistocene Missoula flood deposits within the Othello Channels, Columbia River Gorge, Channeled Scabland , Quincy Basin, Pasco Basin, and the Walla Walla Valley . Based on the presence of multiple interglacial calcretes interbedded with flood deposits, magnetostratigraphy , optically stimulated luminescence dating, and unconformity truncated clastic dikes , it has been estimated that

1540-716: The National Wilderness Preservation System , which consists of federally managed lands that are of a pristine condition, established by the Wilderness Act (Public Law 88-577) in 1964. The National Wilderness Preservation System originally created hundreds of wilderness zones within already protected federally administered property, consisting of over 9 million acres (36,000 km ). Marine Protected Areas (MPAs) began with Executive Order 13158 in May 2000, when official MPAs were established for

1617-472: The Spokane Valley – Rathdrum Prairie immediately downstream of Glacial Lake Missoula, for which several previous estimates had placed the maximum discharge of 17 × 10 m /s and the total amount of water discharged equal to the maximum estimated volume of Lake Missoula (2184 km ). Neglecting erosion effects, their simulated water flow was based on modern-day topography. Their major findings were that

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1694-861: The 2021 report specific to the need for climate adaptation : "Resist-Accept-Direct (RAD): A Framework for the 21st-century Natural Resource Manager." This "Natural Resource Report" has ten authors. Among them are four associated with the National Park Service, three with the US Fish and Wildlife Service , and two with the US Geological Survey — all of which are government agencies within the US Department of Interior. The report's Executive Summary, points to "intensifying global change." "... The convention of using baseline conditions to define goals for today's resource management

1771-589: The Channeled Scabland landforms were formed mainly by multiple periodic floods or by a single grand-scale cataclysmic flood from late Pleistocene Glacial Lake Missoula or an unidentified Canadian source continued through 1999. Shaw's team of geologists reviewed the sedimentary sequences of the Touchet beds and concluded that the sequences do not automatically imply multiple floods separated by decades or centuries. Rather, they proposed that sedimentation in

1848-483: The Columbia Gorge would be expected to produce higher flow resistance and correspondingly higher floods. The dating for Waitt's proposed separation of layers into sequential floods has been supported by subsequent paleomagnetism studies, which support a 30–40 year interval between depositions of Mount St. Helens' ash, and hence flood events, but do not preclude an up to 60-year interval. Offshore deposits on

1925-541: The Columbia River gorge, it backed up again at the 1 mile (1.6 km) wide narrows near Kalama, Washington . Some temporary lakes rose to an elevation of more than 400 ft (120 m), flooding the Willamette Valley to Eugene, Oregon and beyond. Iceberg-rafted glacial erratics and erosion features are evidence of these events. Lake-bottom sediments deposited by the floods have contributed to

2002-624: The Glacial Lake Missoula basin resulted from jökulhlaups draining into Lake Missoula from British Columbia to the north. Further, Shaw's team proposed the scabland flooding might have partially originated from an enormous subglacial reservoir that extended over much of central British Columbia, particularly including the Rocky Mountain Trench , which may have discharged by several paths, including one through Lake Missoula. This discharge, if occurring concurrently with

2079-550: The Interior bureau or program. The NPS budget is divided into two primary areas, discretionary and mandatory spending. Within each of these areas, there are numerous specific purposes to which Congress directs the services activities. The NPS budget includes discretionary spending which is broken out into two portions: the direct operations of the National Parks and the special initiatives. Listed separately are

2156-669: The NPS, rather than the War Department , should manage historic American Civil War sites. President Roosevelt agreed and issued two executive orders to implement the reorganization. These two executive orders transferred to the NPS all of the War Department's historic sites as well as national monuments that the Department of Agriculture had managed and parks in and around Washington, D.C. that an independent federal office had previously operated. The popularity of

2233-472: The National Park Service, which have a wide variety of titles or designations. The system as a whole is considered to be a national treasure of the United States, and some of the more famous national parks and monuments are sometimes referred to as " crown jewels ". The system encompasses approximately 85.1 million acres (0.344 million km ), of which 2.6 million acres (0.011 million km ) remain in private ownership. The largest unit

2310-497: The National Parks" was prepared by a five-member advisory board on Wildlife Management, appointed by United States Secretary of the Interior Stewart Udall . This report came to be referred to in later years by its chairman and principal author, A. Starker Leopold . The Leopold Report was just fourteen pages in length, but it set forth ecosystem management recommendations that would guide parks policy until it

2387-623: The Park Service. New parks were added to preserve unique resources and existing park facilities were upgraded and expanded. In 1966, as the Park Service turned 50 years old, emphasis began to turn from just saving great and wonderful scenery and unique natural features to making parks accessible to the public. Director George Hartzog began the process with the creation of the National Lakeshores and then National Recreation Areas . A 1963 report titled "Wildlife Management in

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2464-658: The Snake River in Idaho, and the Columbia River in Washington and Oregon, these lava flows have been extensively exposed by erosion (with extensive displays of columnar basalt ), and measure almost 2 km (1.2 mi) in total thickness. The basalts flows which are visible in the Wallula Gap were laid down during the Miocene Epoch , about 17 million years ago. They are part of the massive fissure flood basalts of

2541-699: The Waterville Plateau into Moses Coulee, but later, when the Okanagan lobe blocked that route, eroding the Grand Coulee to discharge there as a substantially lower outlet. The Komatsu analysis does not evaluate the impact of the considerable erosion observed in this basin during the flood or floods. However, the assumption that flood hydraulics can be modeled using modern-day topography is an area that warrants further consideration. Earlier narrower constrictions at places such as Wallula Gap and through

2618-401: The action by signing the act into law. The exception, under the Antiquities Act , allows the president to designate and protect areas as national monuments by executive order. Regardless of the method used, all parks are to be of national importance. A potential park should meet all four of the following standards: Before creation of a new unit, Congress typically directs the NPS to conduct

2695-702: The agency on August 25, 1916, through the National Park Service Organic Act . Its headquarters is in Washington, D.C. , within the main headquarters of the Department of the Interior. The NPS employs about 20,000 people in 431 units covering over 85 million acres (0.34 million km ) in all 50 states , the District of Columbia, and US territories . In 2019, the service had more than 279,000 volunteers. The agency

2772-526: The agricultural richness of the Willamette and Columbia Valleys. Glacial deposits overlaid with centuries of windblown sediments ( loess ) have scattered steep, southerly sloping dunes throughout the Columbia Valley, ideal conditions for orchard and vineyard development at higher latitudes. After analysis and controversy, geologists now believe that there were 40 or more separate floods, although

2849-474: The breach of the Lake Missoula ice dam, would have provided significantly larger volumes of water. Further, Shaw and the team proposed that the rhythmic Touchet beds result from multiple pulses or surges within a larger flood. In 2000, a team led by Komatsu simulated the floods numerically with a 3-dimensional hydraulic model. They based the Glacial Lake Missoula discharge rate on the rate predicted for

2926-567: The calculated water depth in each flooded location except for the Spokane Valley–Rathdrum Prairie was shallower than the field evidence showed. For example, their calculated water depth at the Pasco Basin–Wallula Gap transition zone is about 190 m, significantly less than the 280–300 m flood depth indicated by high-water marks. They concluded that a flood of ~10 m /s could not have made the observed high-water marks. In

3003-677: The catastrophic floods, which he called the Spokane floods , in the 1920s. He was researching the Channeled Scablands in Eastern Washington , the Columbia Gorge , and the Willamette Valley of Oregon . Beginning In the summer of 1922, Bretz conducted field research on the Columbia River Plateau for the next seven years. He had been interested in unusual erosion features in the area since 1910 after seeing

3080-538: The concession-run campgrounds (1.42 million). In 2019, the NPS had an annual budget of $ 4.085 billion and an estimated $ 12 billion maintenance backlog. On August 4, 2020, the Great American Outdoors Act was signed into law reducing the $ 12 billion maintenance backlog by $ 9.5 billion over a 5-year period beginning in FY 2021. As of 2022, the NPS had the largest budget allocation of any Department of

3157-406: The cracks, generating more heat, allowing even more water to flow through the cracks. This feedback cycle eventually weakened the ice dam so much that it could no longer support the pressure of the water behind it. It failed catastrophically. This process is known as a glacial lake outburst flood , and there is evidence that many such events occurred in the distant past. As the water emerged from

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3234-545: The effects of the ancient Missoula Floods . National Park Service The National Park Service ( NPS ) is an agency of the United States federal government , within the US Department of the Interior . The service manages all national parks ; most national monuments ; and other natural, historical, and recreational properties, with various title designations. The United States Congress created

3311-513: The enjoyment of future generations". Mather became the first director of the newly formed NPS. On March 3, 1933, President Herbert Hoover signed the Reorganization Act of 1933. The act gave the president the authority to transfer national monuments from one governmental department to another. Later that summer, new president Franklin D. Roosevelt made use of this power after NPS Deputy Director Horace M. Albright suggested that

3388-655: The entire decision space for responding to ecosystems facing the potential for rapid, irreversible ecological change." Here, the iconic species of Joshua Tree National Park is a leading example. The three RAD options are: The "Resist-Accept-Direct" Framework is first described in a July 2020 paper published in Fisheries Eighteen researchers from federal and state agencies and universities collaborated in this effort, which included short case studies of where and how this framework has already been applied. The National Park System includes all properties managed by

3465-408: The exact source of the water is still being debated. The peak flow of the floods is estimated to be 27 cubic kilometers per hour (6.5 cubic miles per hour). The maximum flow speed approached 36 meters/second (130 km/h or 80 mph). Up to 1.9×10 joules of potential energy were released by each flood (the equivalent of 4,500 megatons of TNT ). For comparison, this is 90 times more powerful than

3542-405: The famed African American Buffalo Soldier units. The movement for an independent agency to oversee these federal lands was spearheaded by business magnate and conservationist Stephen Mather . With the help of journalist Robert Sterling Yard , Mather ran a publicity campaign for the Department of the Interior . They wrote numerous articles that praised the scenic and historic qualities of

3619-404: The first time. The initial listing of U.S. areas was presented in 2010, consisting of areas already set aside under other legislation. The NPS has 19 park units designated as MPAs. The National Park System received over 325 million recreation visits in 2023. Park visitation grew 64 percent between 1979 and 2015. The 10 most-visited units of the National Park System handle around 30 percent of

3696-567: The flood waters through the gap, combined with the elevated levels downstream of the constriction resulted in a head of about 250 meters. The peak flow is estimated to have been about 10 million cubic meters per second. The Lewis and Clark Expedition (a.k.a. Corps of Discovery) first saw the Wallula Gap on October 18, 1805, as they headed downstream from their camp at the confluence of the Columbia and Snake rivers. The Corps camped near Spring Gulch Creek that night, and proceeded through Wallula Gap

3773-507: The following legend recounts the origin of the rocks: Coyote, the Trickster spirit hero of many native stories, fell in love with three sisters who were building a salmon trap on the river near here. Each night Coyote would destroy their trap, and each day the girls would rebuild it. One morning Coyote saw the girls crying and found out that they were starving because they had not been able to catch any fish in their trap. Coyote promised them

3850-664: The gap contributed substantially to the erosion of the gap, as is evidenced by the shear walls and by scab-features such as "Twin Sisters". During the Missoula floods, water backed up in the Pasco Basin because of the narrow opening of the Wallula Gap. The floods were so large in volume that they could not rapidly discharge through the gap, even though it is 2 km (1.2 mi) wide. Maximum flood waters reached elevations of about 380 meters. The hydraulic head required to drive

3927-613: The glacial waters that poured across the Channeled Scablands during the Missoula floods . The Wallula Gap constrained the flow such that less than 1/5 of the 800 km (190 cu mi) of water per day entering could be discharged as it passed into Lake Condon downstream. As a result, the floods filled the Pasco Basin and formed, for a short period, Lake Lewis . The large volumes of flood water passing through

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4004-659: The ice would reform, creating Glacial Lake Missoula again. These floods have been researched since the 1920s. During the last deglaciation that followed the end of the Last Glacial Maximum , geologists estimate that a cycle of flooding and reformation of the lake lasted an average of 55 years and that the floods occurred several times over the 2,000 years between 15,000 and 13,000 years ago. U.S. Geological Survey hydrologist Jim O'Connor and Spain 's Museo Nacional de Ciencias Naturales scientist Gerardo Benito have found evidence of at least twenty-five massive floods,

4081-507: The largest discharging about 10 cubic kilometers per hour (2.7 million m³/s, 13 times that of the Amazon River ). Alternate estimates for the peak flow rate of the largest flood range up to 17 cubic kilometers per hour. The maximum flow speed approached 36 meters/second (130 km/h or 80 mph). Within the Columbia River drainage basin , detailed investigation of the Missoula floods' glaciofluvial deposits , informally known as

4158-476: The largest of the boulders moved by the flood. He estimated the water flow was 9 cubic miles per hour (38 km /h), more than the combined flow of every river in the world. More recent estimates place the flow rate at ten times the flow of all current rivers combined. The Missoula floods have also been referred to as the Bretz floods in honor of Bretz. As the depth of the water in Lake Missoula increased,

4235-545: The lowest along the ridge. The ancient Salmon-Clearwater River began to flow across the ridge over this low point, cutting a channel. As the ridge continued to fold upward, erosion cut through and the water gap was formed. Until about ten million years ago, the Salmon-Clearwater River flowed through the Wallula Gap alone. As the flood plain in the Columbia Basin continued to tilt, the Columbia River

4312-492: The most popular areas do charge entrance fees. Fees vary site to site and are charged either on a per-vehicle or per-person basis, with most passes valid for 7 days. The America the Beautiful Pass series waives the per-vehicle fee or per-person fee for the holder and up to 3 other adults (children age 15 and younger are admitted for free at most sites). Annual passes for single areas are also available for those who visit

4389-440: The most powerful nuclear weapon ever detonated, the 50-megaton " Tsar Bomba ". The cumulative effect of the floods was to excavate 210 cubic kilometres (50 cu mi) of loess, sediment, and basalt from the Channeled Scablands of eastern Washington and to transport it downstream. The multiple flood hypothesis was first proposed by R.B. Waitt Jr. in 1980. Waitt argued for a sequence of 40 or more floods. Waitt's proposal

4466-606: The next day. In the 1840s, pioneers headed west on the Oregon Trail found Wallula a logical stopping place to convert their wagons to boats and then continue the trip via the Columbia River. Twin Sisters is a basalt pillar that inspired the mythology of the Wallula Gap near the Columbia River just upstream of Port Kelley, Washington. According to the Cayuse Indian tribe, who lived on the Columbia Plateau,

4543-664: The oldest of the Pleistocene Missoula floods happened before 1.5 million years ago. Because of the fragmentary nature of older glaciofluvial deposits, which have been largely removed by subsequent Missoula floods, within the Hanford formation, the exact number of older Missoula floods, which are known as ancient cataclysmic floods , that occurred during the Pleistocene cannot be estimated with any confidence. Geologist J Harlen Bretz first recognized evidence of

4620-582: The origin of the Scablands. Both Pardee and Bretz continued their research over the next 30 years, collecting and analyzing evidence that led them to identify Lake Missoula as the source of the Spokane flood and creator of the channeled scablands. After Pardee studied the canyon of the Flathead River , he estimated that flood waters above 45 miles per hour (72 km/h) would be required to roll

4697-400: The overall visits. The top 10 percent of parks (43) handle over 64 percent of all visits, leaving the remaining more than 380 units to accommodate around 36 percent of visits. (Note that only 380 sites recorded visitors during 2021 due to COVID-19-related closures). Most areas of the National Park System do not charge entrance fees and are completely supported by tax dollars, although some of

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4774-481: The parks after the end of the World War II left them overburdened with demands that the NPS could not meet. In 1951, Conrad Wirth became director of the NPS and began to bring park facilities up to the standards that the public was expecting. In 1952, with the support of President Dwight D. Eisenhower , Wirth began Mission 66 , a ten-year effort to upgrade and expand park facilities for the 50th anniversary of

4851-461: The parks and their possibilities for educational, inspirational, and recreational benefits. This campaign resulted in the creation of the NPS. On August 25, 1916, President Woodrow Wilson signed the National Park Service Organic Act that mandated the agency "to conserve the scenery and the natural and historic objects and wildlife therein, and to provide for the enjoyment of the same in such manner and by such means as will leave them unimpaired for

4928-410: The pressure at the bottom of the ice dam increased enough to lower the freezing point of water below the temperature of the ice forming the dam. This allowed liquid water to seep into minuscule cracks present in the ice dam. Over a period of time, the friction from water flowing through these cracks generated enough heat to melt the ice walls and enlarge the cracks. This allowed more water to flow through

5005-429: The same site often. Over 15 million visitors spent a night in one of the national park units during 2015. The largest number (3.68 million) were tent campers. The second largest group (3.38 million) stayed in one of the lodges, followed by miscellaneous stays (on boats, group sites—2.15 million). The last three groups of over-night visitors included RV campers (2.26 million), backcountry campers (2.02 million) and users of

5082-425: The site. Big Cypress National Preserve and Big Thicket National Preserve were created in 1974 as the first national preserves. National reserves are similar to national preserves, but the operational authority can be placed with a state or local government. New Jersey Pinelands National Reserve was the first to be established in 1978. National historic sites protect a significant cultural resource that

5159-506: The sites of larger actions, such as Chickamauga and Chattanooga National Military Park , Vicksburg National Military Park , Gettysburg National Military Park , and Shiloh National Military Park —the original four from 1890. Examples of battlefield parks , battlefield sites , and national battlefields include Richmond National Battlefield Park , Brices Cross Roads National Battlefield Site , and Antietam National Battlefield . National memorials are areas that officially memorialize

5236-536: The special initiatives of the service for the year specified in the legislation. During fiscal year 2010, the service was charged with five initiatives. They include: stewardship and education; professional excellence; youth programs; climate change impacts; and budget restructure and realignment. Missoula Floods The Missoula floods (also known as the Spokane floods , the Bretz floods , or Bretz's floods ) were cataclysmic glacial lake outburst floods that swept periodically across eastern Washington and down

5313-426: The top of the Touchet beds. The two layers of volcanic ash are separated by 1–10 centimetres (0.4–3.9 in) of airborne nonvolcanic silt. The tephra is Mount St. Helens ash that fell in Eastern Washington. By analogy, since there were 40 layers with comparable characteristics at Burlingame Canyon, Waitt argued they all could be considered to have similar separation in deposition time. The controversy about whether

5390-692: The twelve-member NPS Advisory Board Science Committee to take a fresh look at the ecological issues and make recommendations for updating the original Leopold Report. The committee published their 23-page report in 2012, titled, "Revisiting Leopold: Resource Stewardship in the National Parks". The report recommended that parks leadership "manage for change while confronting uncertainty." "... New and emerging scientific disciplines — including conservation biology, global change science, and genomics — along with new technological tools like high-resolution remote sensing can provide significant information for constructing contemporary tactics for NPS stewardship. This knowledge

5467-630: Was based mainly on analysis from glacial lake bottom deposits in Ninemile Creek and the flood deposits in Burlingame Canyon. His most compelling argument for separate floods was that the Touchet bed deposits from two successive floods were found to be separated by two layers of volcanic ash ( tephra ), with the ash separated by a fine layer of windblown dust deposits, located in a thin layer between sediment layers ten rhythmites below

5544-420: Was created in 1937. Indiana Dunes National Lakeshore and Pictured Rocks National Lakeshore , created in 1966, were the first national lakeshores. National rivers and wild and scenic riverways protect free-flowing streams over their length. The riverways may not be altered with dams, channelization, or other changes. Recreational pursuits are encouraged along the waterways. Ozark National Scenic Riverways

5621-684: Was created in 1968 and consists of two major components: National scenic trails are long-distance trails through some of the most scenic parts of the country. They received official protection in 1968. The Appalachian Trail is the best known. National historic trails commemorate the routes of major historic events. Some of the best known are the Trail of Tears , the Mormon Trail , and the Santa Fe Trail . These trails are administered by several federal agencies. Wilderness areas are part of

5698-504: Was established in 1964. National recreation areas originally were units surrounding reservoirs impounded by dams built by other federal agencies, the first being Lake Mead National Recreation Area . Some national recreation areas are in urban centers, such as Gateway National Recreation Area and Golden Gate National Recreation Area , which encompass significant cultural as well as natural resources. The National Trails System preserves long-distance routes across America. The system

5775-577: Was forced eastward and joined the Salmon-Clearwater River about six million years ago. About 2.5 million years ago, the Snake River was forced northward by the Blue Mountain uplift and was captured by the Salmon-Clearwater River near the Idaho-Oregon border. The Wallula Gap was widened about the 14th millennium BC, by the historic flow of the Salmon , Snake , and Columbia rivers combined with

5852-684: Was revisited in 2012. The Leopold Report was the first concrete plan for managing park visitors and ecosystems under unified principles. Park management issues and controversies addressed in this report included the difficulties of managing elk populations in Yellowstone National Park and how "overprotection from natural ground fires" in California's Sequoia National Park , Kings Canyon National Park , and Yosemite National Park had begun to threaten groves of Giant Sequoia with catastrophic wildfires. The report also established

5929-561: Was the first in 1906. While the National Park Service holds the most national monuments, a monument may be managed or co-managed by a different entity such as the Bureau of Land Management or the Forest Service . National preserves are for the protection of certain resources and operate similar to many National Parks, but allow limited resource extraction. Activities like hunting, fishing, and some mining may be allowed depending on

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