Historic Bridges of the U.S.

Photos

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Side view

Photos taken by Bill Burmaster

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Portal

Vicinity map

Map links:

Overview: Four-span through truss bridge over the Illinois River on IL 170 at Seneca
Location: La Salle County, Illinois
Status: Open to two-lane traffic
Future prospects: replacement bridge under construction
History: Built 1932; rehabilitated 1986
Design: Pennsylvania through truss
Dimensions: Length of largest span: 363.7 ft.
Total length: 1,509.4 ft.
Deck width: 23.0 ft.
Vertical clearance above deck: 15.0 ft.
Approximate latitude, longitude: +41.30167, -88.60944 (decimal degrees)
41°18'06" N, 88°36'34" W (degrees°minutes'seconds")
Approximate UTM coordinates: 16/365260/4573495 (zone/easting/northing)
USGS topographic map: Seneca
Inventory numbers: IL 050-0070 (Illinois bridge number)
BH 15419 (Bridgehunter.com ID)
Inspection (as of 09/2007): Deck condition rating: Satisfactory (6 out of 9)
Superstructure condition rating: Poor (4 out of 9)
Substructure condition rating: Poor (4 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 45.3 (out of 100)
Average daily traffic (as of 2007): 5,300

Seneca Bridge

Posted December 27, 2008, by Ron (mfpd24 [at] yahoo [dot] com)

A new bridge is currently being constructed alongside to the east as of 12/08