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General Information

Beginning of works: 1896
Completion: 1897
Status: in use

Project Type

Location

Location: , ,
Crosses:
  • Dearborn River
Coordinates: 47° 16' 52.03" N    112° 23' 27.75" W
Show coordinates on a map

Technical Information

Dimensions

total length 48.8 m

Cost

cost of construction United States dollar 9 997

Materials

truss steel

Chronology

1983

Grain truck falls partially through the bridge deck. Damage repaired afterwards.

Notes

The bridge was recently subjected to a major rehabilitation at a cost of US$ 1.2 million. The superstructure was maintained as with the original design. It is probably the only bridge of its design remaining in the United States.

Excerpt from Wikipedia

The Dearborn River High Bridge is a Pratt half-deck truss bridge built in 1897, and has been placed on the National Register of Historic Places as it is one of the few bridges of its type left standing in the United States. On a half-deck bridge, the deck is attached in the center rather than, as is more common, top or bottom of the superstructure. It crosses the Dearborn River on Lake Bean Road (Montana Secondary 435) about 15 miles (24 km) southwest of Augusta, Montana. The unusual design of the Dearborn River High Bridge suits it to carry light loads across high/deep crossings. It has four spans and originally had a wooden plank deck. It is the last standing pin-connected Pratt half-deck truss bridge left in the United States. Construction cost was $9,997. Construction began in 1896 and completed in 1897.

This crossing point on the Dearborn River had been used for many years by the local Indian tribes, primarily the Blackfeet. Prior to the bridge's construction this location was known as the Ponderay Crossing. The river was named for United States Secretary of War Henry Dearborn by Lewis and Clark in 1805. The area was left largely unexplored by Europeans for the next 50 years or so. The bridge was rehabilitated in 2003 by the Montana Department of Transportation, with Sletten Construction of Great Falls, Montana as the lead contractor, and was placed on the National Register of Historic Places on December 18, 2003.

Text imported from Wikipedia article "Dearborn River High Bridge" and modified on 22 July 2019 under the CC-BY-SA 3.0 license.

Relevant Web Sites

Relevant Publications

  • About this
    data sheet
  • Structure-ID
    20001405
  • Published on:
    30/03/2001
  • Last updated on:
    30/05/2017
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