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39-631: The dam impounds the river to create the Owyhee Reservoir , with storage capacity of nearly 1,200,000 acre-feet (1.5 km) of water. The more than 400-foot (120 m) tall concrete-arch gravity dam is owned by the United States Bureau of Reclamation (USBR) and operated by the Owyhee Irrigation District. Haystack Rock Road is carried over the 833-foot (254 m) long crest of the dam. In August 1927,

78-543: A prime meridian at the westernmost known land, designated the Fortunate Isles , off the coast of western Africa around the Canary or Cape Verde Islands , and measured north or south of the island of Rhodes off Asia Minor . Ptolemy credited him with the full adoption of longitude and latitude, rather than measuring latitude in terms of the length of the midsummer day. Ptolemy's 2nd-century Geography used

117-463: A hydraulic height of 325 feet (99 m). Total concrete used in this arch gravity style dam was 537,500 cubic yards (410,900 m). The dam's spillway can allow 41,790 cubic feet (1,183 m) per second of water flow, while its tunnel capacity is 1,100 cubic feet (31 m) per second. The outlet works can allow up to 2,530 cubic feet (72 m) per second. If full, the reservoir would hold 1,183,300 acre-feet (1.4596 × 10 m) of water, and

156-679: A little before 1300; the text was translated into Latin at Florence by Jacopo d'Angelo around 1407. In 1884, the United States hosted the International Meridian Conference , attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich , England as the zero-reference line. The Dominican Republic voted against

195-416: A location often facetiously called Null Island . In order to use the theoretical definitions of latitude, longitude, and height to precisely measure actual locations on the physical earth, a geodetic datum must be used. A horizonal datum is used to precisely measure latitude and longitude, while a vertical datum is used to measure elevation or altitude. Both types of datum bind a mathematical model of

234-538: A longitudinal degree is 111.3 km. At 30° a longitudinal second is 26.76 m, at Greenwich (51°28′38″N) 19.22 m, and at 60° it is 15.42 m. On the WGS   84 spheroid, the length in meters of a degree of latitude at latitude ϕ (that is, the number of meters you would have to travel along a north–south line to move 1 degree in latitude, when at latitude ϕ ), is about The returned measure of meters per degree latitude varies continuously with latitude. Similarly,

273-700: A national cartographical organization include the North American Datum , the European ED50 , and the British OSGB36 . Given a location, the datum provides the latitude ϕ {\displaystyle \phi } and longitude λ {\displaystyle \lambda } . In the United Kingdom there are three common latitude, longitude, and height systems in use. WGS   84 differs at Greenwich from

312-872: A simple translation may be sufficient. Datums may be global, meaning that they represent the whole Earth, or they may be local, meaning that they represent an ellipsoid best-fit to only a portion of the Earth. Examples of global datums include World Geodetic System (WGS   84, also known as EPSG:4326 ), the default datum used for the Global Positioning System , and the International Terrestrial Reference System and Frame (ITRF), used for estimating continental drift and crustal deformation . The distance to Earth's center can be used both for very deep positions and for positions in space. Local datums chosen by

351-503: A year, or 10 m in a century. A weather system high-pressure area can cause a sinking of 5 mm . Scandinavia is rising by 1 cm a year as a result of the melting of the ice sheets of the last ice age , but neighboring Scotland is rising by only 0.2 cm . These changes are insignificant if a local datum is used, but are statistically significant if a global datum is used. On the GRS   80 or WGS   84 spheroid at sea level at

390-586: Is where Earth's equatorial radius a {\displaystyle a} equals 6,378,137 m and tan ⁡ β = b a tan ⁡ ϕ {\displaystyle \textstyle {\tan \beta ={\frac {b}{a}}\tan \phi }\,\!} ; for the GRS   80 and WGS   84 spheroids, b a = 0.99664719 {\textstyle {\tfrac {b}{a}}=0.99664719} . ( β {\displaystyle \textstyle {\beta }\,\!}

429-662: Is not a well-defined measure . Owyhee Reservoir or Owyhee Lake is a reservoir on the Owyhee River in Malheur County , Oregon , United States . Located in far Eastern Oregon near the Idaho border, the reservoir is Oregon's longest at 52 miles (84 km). The 13,900-acre (56 km ) lake is home to several species of fish, including crappie , rainbow trout , largemouth bass , smallmouth bass , yellow perch , and brown bullhead . An artificial lake, it

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468-639: Is 53 miles (85 km) long. The total drainage area of the dam and reservoir is 10,900 square miles (28,000 km) in Eastern Oregon and western Idaho . Owyhee Dam was the tallest dam in the world until the Lac du Chambon dam was built in France in 1934 at 136.7 meters (448 feet). Owyhee Reservoir Coordinates : 43°27′41″N 117°20′18″W  /  43.46139°N 117.33833°W  / 43.46139; -117.33833 From Misplaced Pages,

507-418: Is a spherical or geodetic coordinate system for measuring and communicating positions directly on Earth as latitude and longitude . It is the simplest, oldest and most widely used of the various spatial reference systems that are in use, and forms the basis for most others. Although latitude and longitude form a coordinate tuple like a cartesian coordinate system , the geographic coordinate system

546-404: Is different from Wikidata Pages using infobox body of water with auto short description Coordinates on Wikidata Articles using infobox body of water without image bathymetry Commons category link from Wikidata Webarchive template wayback links Geographic coordinate system This is an accepted version of this page A geographic coordinate system ( GCS )

585-544: Is not cartesian because the measurements are angles and are not on a planar surface. A full GCS specification, such as those listed in the EPSG and ISO 19111 standards, also includes a choice of geodetic datum (including an Earth ellipsoid ), as different datums will yield different latitude and longitude values for the same location. The invention of a geographic coordinate system is generally credited to Eratosthenes of Cyrene , who composed his now-lost Geography at

624-753: Is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses (often called great circles ), which converge at the North and South Poles. The meridian of the British Royal Observatory in Greenwich , in southeast London, England, is the international prime meridian , although some organizations—such as the French Institut national de l'information géographique et forestière —continue to use other meridians for internal purposes. The prime meridian determines

663-405: Is ultimately calculated from latitude and longitude, it is crucial that they clearly state the datum on which they are based. For example, a UTM coordinate based on WGS84 will be different than a UTM coordinate based on NAD27 for the same location. Converting coordinates from one datum to another requires a datum transformation such as a Helmert transformation , although in certain situations

702-494: The Library of Alexandria in the 3rd century BC. A century later, Hipparchus of Nicaea improved on this system by determining latitude from stellar measurements rather than solar altitude and determining longitude by timings of lunar eclipses , rather than dead reckoning . In the 1st or 2nd century, Marinus of Tyre compiled an extensive gazetteer and mathematically plotted world map using coordinates measured east from

741-1333: The Wayback Machine : U.S. Bureau of Reclamation Oregon Department of Fish and Wildlife Archived 2010-05-26 at the Wayback Machine US Bureau of Reclamation reservoir levels and flows Archived 2009-01-18 at the Wayback Machine Retrieved from " https://en.wikipedia.org/w/index.php?title=Owyhee_Reservoir&oldid=1189944773 " Categories : Reservoirs in Oregon Owyhee River Owyhee Desert Bureau of Land Management areas in Oregon Lakes of Malheur County, Oregon Tourist attractions in Malheur County, Oregon Buildings and structures in Malheur County, Oregon Protected areas of Malheur County, Oregon 1932 establishments in Oregon Hidden categories: Pages using gadget WikiMiniAtlas Articles with short description Short description

780-512: The Equator, one latitudinal second measures 30.715 m , one latitudinal minute is 1843 m and one latitudinal degree is 110.6 km. The circles of longitude, meridians, meet at the geographical poles, with the west–east width of a second naturally decreasing as latitude increases. On the Equator at sea level, one longitudinal second measures 30.92 m, a longitudinal minute is 1855 m and

819-1030: The Interior . Retrieved 2009-05-04 . ^ Oregon Blue Book: Oregon Almanac: Nut, State to Shoes, Oldest. Oregon Secretary of State. Retrieved on March 28, 2008. ^ "Owyhee Reservoir" . Wildernet.com . Retrieved 2008-07-23 . ^ "Owyhee Project" . U.S. Bureau of Reclamation. Archived from the original on 2008-06-02 . Retrieved 2008-07-23 . ^ Ellis, Sean (17 April 2015). "Owyhee Irrigation District farmers face another tough year" . Capital Press . Retrieved April 17, 2015 . ^ "Lake Owyhee State Park" . State Parks . Oregon Parks and Recreation Department . Retrieved 2008-07-23 . ^ "Owyhee Reservoir" . The Columbia Gazetteer of North America . Columbia University Press. 2000 . Retrieved 2008-07-23 . External links [ edit ] [REDACTED] Media related to Owyhee Reservoir at Wikimedia Commons Owyhee Dam Archived 2013-03-13 at

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858-681: The US Congress authorized the building of a dam in the canyon of the Owyhee River. Construction of the dam began in 1928 to provide water for irrigation projects. It was built on a foundation of massive rhyolite, massive pitchstone, and associated unmassive pitchstone agglomerate geologic formations adjacent to the Owyhee Mountains . A project of the Bureau of Reclamation, they hired General Construction Company from Seattle to build

897-669: The dam and power sold to the Idaho Power Company . Owyhee has a unique spillway located part way up the dam that utilizes a 60-foot (18 m) in diameter tunnel to send excess water to the river below during Spring run-off. The United States Bureau of Reclamation owns the facility, and the Owyhee Irrigation District operates the dam. The following data are from the Western Regional Climate Center, accessed in March 2018. The record high temperature

936-595: The dam was added to the National Register of Historic Places as part of the Owyhee Dam Historic District. Water stored at the reservoir is used to irrigate approximately 120,000 acres (490 km) for use in farming. Four different irrigation district utilize the water from Owyhee Reservoir . There are three hydro-power generating facilities at the reservoir added between 1985 and 1993, with seven megawatt and five megawatt turbines at

975-569: The dam. Former Oregonian and then United States President Herbert Hoover dedicated what was the highest dam of its type in the world on July 17, 1932. Secretary of the Interior Ray Lyman Wilbur delivered Hoover's message at the dam. Owyhee's construction served as a prototype for the larger Hoover Dam on the Colorado River , including the use of refrigeration to cool the concrete. The dam cost $ 6,000,000, with

1014-464: The far western Aleutian Islands . The combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The visual grid on a map formed by lines of latitude and longitude is known as a graticule . The origin/zero point of this system is located in the Gulf of Guinea about 625 km (390 mi) south of Tema , Ghana ,

1053-1345: The 💕 Reservoir in Malheur County, Oregon Owyhee Reservoir [REDACTED] [REDACTED] [REDACTED] Owyhee Reservoir Show map of Oregon [REDACTED] [REDACTED] Owyhee Reservoir Show map of the United States Location Malheur County, Oregon Coordinates 43°27′41″N 117°20′18″W  /  43.46139°N 117.33833°W  / 43.46139; -117.33833 Type reservoir Primary inflows Owyhee River Primary outflows Owyhee River Catchment area 11,160 sq mi (28,900 km ) Basin  countries United States First flooded 1932 Max. length 52 mi (84 km) Surface area 13,900 acres (5,600 ha) Average depth 81 ft (25 m) Max. depth 117 ft (36 m) Water volume 1,122,000 acre⋅ft (1,384,000 dam ) Residence time 1.7 years Shore length 125 mi (201 km) Surface elevation 2,670 ft (810 m) Website www .usbr .gov /pn /hydromet /ramps /owyhee /owyhee .html Shore length

1092-415: The length in meters of a degree of longitude can be calculated as (Those coefficients can be improved, but as they stand the distance they give is correct within a centimeter.) The formulae both return units of meters per degree. An alternative method to estimate the length of a longitudinal degree at latitude ϕ {\displaystyle \phi } is to assume a spherical Earth (to get

1131-481: The motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911. The latitude ϕ of a point on Earth's surface is the angle between the equatorial plane and the straight line that passes through that point and through (or close to) the center of the Earth. Lines joining points of the same latitude trace circles on

1170-523: The one used on published maps OSGB36 by approximately 112   m. The military system ED50 , used by NATO , differs from about 120   m to 180   m. Points on the Earth's surface move relative to each other due to continental plate motion, subsidence, and diurnal Earth tidal movement caused by the Moon and the Sun. This daily movement can be as much as a meter. Continental movement can be up to 10 cm

1209-535: The proper Eastern and Western Hemispheres , although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E. This is not to be conflated with the International Date Line , which diverges from it in several places for political and convenience reasons, including between far eastern Russia and

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1248-430: The same datum will obtain the same location measurement for the same physical location. However, two different datums will usually yield different location measurements for the same physical location, which may appear to differ by as much as several hundred meters; this not because the location has moved, but because the reference system used to measure it has shifted. Because any spatial reference system or map projection

1287-664: The same prime meridian but measured latitude from the Equator instead. After their work was translated into Arabic in the 9th century, Al-Khwārizmī 's Book of the Description of the Earth corrected Marinus' and Ptolemy's errors regarding the length of the Mediterranean Sea , causing medieval Arabic cartography to use a prime meridian around 10° east of Ptolemy's line. Mathematical cartography resumed in Europe following Maximus Planudes ' recovery of Ptolemy's text

1326-486: The shape of the earth (usually a reference ellipsoid for a horizontal datum, and a more precise geoid for a vertical datum) to the earth. Traditionally, this binding was created by a network of control points , surveyed locations at which monuments are installed, and were only accurate for a region of the surface of the Earth. Some newer datums are bound to the center of mass of the Earth. This combination of mathematical model and physical binding mean that anyone using

1365-464: The surface of Earth called parallels , as they are parallel to the Equator and to each other. The North Pole is 90° N; the South Pole is 90° S. The 0° parallel of latitude is designated the Equator , the fundamental plane of all geographic coordinate systems. The Equator divides the globe into Northern and Southern Hemispheres . The longitude λ of a point on Earth's surface

1404-668: The total reclamation project costing $ 18,000,000. Owyhee was designed by Frank A. Banks , who also designed other dams such as the Grand Coulee Dam on the Columbia River . In the 1980s, electricity-generating capabilities were added to the dam. From 1990 to 1993, the dam was remodeled. Since the height of the dam made a fish ladder impractical, the dam closed off the Owyhee Chinook salmon runs that used to swim as far upstream as Nevada . On September 23, 2010,

1443-445: The width per minute and second, divide by 60 and 3600, respectively): where Earth's average meridional radius M r {\displaystyle \textstyle {M_{r}}\,\!} is 6,367,449 m . Since the Earth is an oblate spheroid , not spherical, that result can be off by several tenths of a percent; a better approximation of a longitudinal degree at latitude ϕ {\displaystyle \phi }

1482-574: Was 112 °F in July 2002 and the record low was -22 °F in January 1962. Annual precipitation is low, averaging less than 10 inches per year, and diurnal temperature variation is very high in the summer. Owyhee is 833 feet (254 m) long at the crest, which is 30 feet (9.1 m) wide. The base of the dam is 265 feet (81 m) wide, with a height of 417 feet (127 m). The crest elevation sits at 2,675 feet (815 m) above sea level and has

1521-1086: Was created in 1932 with the completion of the Owyhee Dam . The lake supplies water for irrigation for 1,800 farms covering 118,000 acres of land in Eastern Oregon and Southwestern Idaho. Seasonal Lake Owyhee State Park is located on the northeast shore and includes a boat ramp . See also [ edit ] Owyhee Reservoir State Airport List of lakes in Oregon References [ edit ] [REDACTED] Owyhee Dam → O R E G O N I D A H O ^ Johnson, Daniel M. (1985). "Owyhee Lake". Atlas of Oregon Lakes (PDF) . Corvallis: Oregon State University Press . p. 116. ISBN   9780870713422 . OCLC   11030545 . Retrieved 2014-04-08 . ^ "Lake Owyhee" . Geographic Names Information System . United States Geological Survey , United States Department of

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