The Carrizo Bridges are a pair of timber stringer bridges which brought the main cross-continental highway of northern Arizona, the Old Trails Highway , across two branches of Carrizo Wash , an arroyo , in northern Arizona . The highway through this area became U.S. Route 66 , and the roadway eventually became a frontage road on the south side of Interstate 40 . It is labelled on some maps as Old Route 66. The bridges are also known as Little Lithodendron Bridge and Lithodendron Bridge .
8-413: A timber stringer bridge was the cheapest way to span spaces like arroyos. It consists of parallel timber logs laid across timber pile bents . These were by far the most common bridge type built in the state of Colorado, for example, historically. At least one source has used the term Carrizo Wash to describe the two arroyos, terming them as two branches. The two branches/washes separately run south to
16-761: The Interstate 40 in Navajo County, Arizona about 15.8 miles (25.4 km) northeast of Holbrook, Arizona , it was built in 1932. It was listed on the National Register of Historic Places in 1988. Bent (structural) A bent in American English is a transverse rigid frame (or similar structures such as three-hinged arches ). Historically, bents were a common way of making a timber frame ; they are still often used for such, and are also seen in small steel-frame buildings, where
24-463: The Puerco River , which parallels Interstate 40 to the south. The western one is Little Lithodendron Wash and the eastern one is Lithodendron Wash . Both bridges were constructed in 1932 by contractor Canion & Royden, and both were listed on the National Register of Historic Places in 1988. Nearly identical in their original construction, they are now very different from one another, as
32-475: The German is bind . Compare this with the term bend for a class of knots. Bents are the building blocks that define the overall shape and character of a structure. They do not have any sort of pre-defined configuration in the way that a Pratt truss does. Rather, bents are simply cross-sectional templates of structural members, i.e., rafters, joists, posts, pilings, etc., that repeat on parallel planes along
40-437: The length of the structure. The term bent is not restricted to any particular material. Bents may be formed of wooden piles, timber framing, steel framing, or even concrete. Traditional timber frame bents were one component of a braced frame in timber framing . Historically, mortise and tenon joints were used to joint bents to posts and beams due to the unavailability of nails. Bents are generally pre-assembled, either at
48-473: The term portal frame is more commonly used. The term is also used for the cross-ways support structures in a trestle . In British English this assembly is called a " cross frame ". The term bent is probably an archaic past tense of the verb to bind , referring to the way the timbers of a bent are joined together. The Dutch word is bint (past participle gebint ), the West Frisian is bynt , and
56-417: The timber framing company's shop or at the construction site. After the basic post and beam structure of the frame has been set in place, the bents are then lifted and simply lowered into place one by one by the crane. Next, the workers bring in additional members, purlins , which tie them together and give the frame a more rigid structure. This process is very safe and efficient, as it allows a crew to assemble
64-423: The western has been maintained and the other was abandoned and has deteriorated. Download coordinates as: The Little Lithodendron Wash Bridge , the western one of the pair, has 18 spans and was in excellent condition when listed in 1988. It is located about 13.2 miles (21.2 km) northeast of Holbrook. The Lithodendron Wash Bridge , the eastern one of the pair of bridges, is a 22 span bridge. Located off
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