Historic Bridges of the U.S. | West Multnomah Falls Viaduct

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West Multnomah Falls Viaduct

HAER ORE,26-TROUT.V,1G-1

Photo taken by Historic American Engineering Record

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DETAIL OF RUBBLE ABUTMENT AT WEST END OF WEST MULTNOMAH FALLS VIADUCT

HAER ORE,26-TROUT.V,1G-2

Photo taken by Historic American Engineering Record

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DETAIL OF HALF VIADUCT CONCRETE CONSTRUCTION FOR WEST MULTNOMAH FALLS VIADUCT

HAER ORE,26-TROUT.V,1G-3

Photo taken by Historic American Engineering Record

Overview: Bridge over rocky terrain along railroad tracks on Historical Columbia River Highway
Location: Multnomah County, Oregon
Status: Open to traffic
History: Built 1914
Builders: - Karl P. Billner (Design Engineer)
- Pacific Bridge Co. (Contractor)
Design: This 400' half-viaduct was an engineer's solution to aligning the Historical Columbia River Highway between a steep unstable slope and the Oregon Washington Railroad and Navigation Company main line right-of-way. It is a companion to the East Multnomah Falls Viaduct.
(HAER No. OR-36-J)
Dimensions: Length of largest span: 20.0 ft.
Total length: 401.9 ft.
Deck width: 17.4 ft.
Approximate latitude, longitude: +45.57639, -122.12028 (decimal degrees)
45°34'35" N, 122°07'13" W (degrees°minutes'seconds")
Approximate UTM coordinates: 10/568636/5047359 (zone/easting/northing)
Inventory number: BH 37536 (Bridgehunter.com ID)
Inspection (as of 08/2007): Deck condition rating: Poor (4 out of 9)
Superstructure condition rating: Poor (4 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 16.5 (out of 100)
Average daily traffic (as of 2004): 970