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Silver Bridge

Canyon County, Idaho

Photos 

Silver Bridge

Photo from Canyon Highway District 4

License: Released into public domain

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View this photo at canyonhd4.org

BH Photo #446624

Map 

Street Views 

Facts 

Overview
Camelback Warren through truss bridge over Boise River on STC 7787
Location
Caldwell, Canyon County, Idaho
Status
Open to traffic
Future prospects
http://www.canyonhd4.org/highway-30-bridge.php
History
Built 1922
Builders
- American Bridge Co. of New York (Contractor)
- F. H. McConnel of Caldwell, Idaho (Design)
Design
Three span polygonal Warren through truss with riveted connections.
5-slope Camelback format upper chord.
Dimensions
Length of largest span: 128.0 ft.
Total length: 388.1 ft.
Deck width: 19.4 ft.
Vertical clearance above deck: 14.3 ft.
Recognition
Posted to the National Register of Historic Places on February 7, 2007
Also called
Boise River Greenway - Plymouth Street Bridge (Future Name)
Canyon Hill Bridge
Red Train Bridge (Local Misnomer)
Boise River and Canal Bridge
Highway 30 Bridge
Approximate latitude, longitude
+43.68886, -116.68745   (decimal degrees)
43°41'20" N, 116°41'15" W   (degrees°minutes'seconds")
Approximate UTM coordinates
11/525189/4837363 (zone/easting/northing)
Quadrangle map:
Caldwell
Average daily traffic (as of 2016)
800
Inventory numbers
ID 26725 (Idaho bridge number)
NRHP 07000003 (National Register of Historic Places reference number)
BH 14854 (Bridgehunter.com ID)
Inspection report (as of September 2018)
Overall condition: Poor
Superstructure condition rating: Poor (4 out of 9)
Substructure condition rating: Poor (4 out of 9)
Deck condition rating: Poor (4 out of 9)
Sufficiency rating: 45.9 (out of 100)
View more at BridgeReports.com

Categories 

American Bridge Co. (1,505)
Built 1922 (695)
Built during 1920s (9,922)
Caldwell, Idaho (6)
Canyon County, Idaho (18)
F. H. McConnel (1)
Have street view (26,928)
Idaho (455)
Idaho-Pacific Highway (3)
NR-listed (2,960)
One-lane traffic (7,606)
 Open (39,880)
Polygonal Warren through truss (430)
Polygonal Warren truss (1,051)
Preserved (1,180)
Road-to-trail (105)
Span length 125-175 feet (4,219)
Through truss (15,054)
Total length 250-500 feet (5,223)
Truss (32,770)
US 30 (126)
Warren truss (6,563)

Update Log 

  • April 4, 2020: Updated by Geoff Hubbs: Added NRHP listing and more alternate names
  • April 15, 2019: New photo from Geoff Hubbs
  • May 9, 2016: Updated by Luke: Added builder, noted that the bridge is being replaced, but will remain intact as a pedestrian bridge.
  • July 13, 2010: Updated by Nathan Holth: Updated GPS, Bridge Type, Street View

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