St. Mary River Aqueduct Bridge

Facts 

Overview

Two-span through truss bridge over St. Mary River on CR 224, also carrying a pair of water pipelines

Location

Glacier County, Montana

Status

Open to traffic

History

Built 1915 by the Minneapolis Bridge Co.

Builder

- Minneapolis Bridge Co.

Design

Two double-barreled pin-connected, 6-panel Pratt through trusses

Dimensions

Length of largest span: 100.1 ft.
Total length: 201.1 ft.
Deck width: 16.4 ft.
Vertical clearance above deck: 16.3 ft.

Recognition

Eligible for the National Register of Historic Places

Approximate latitude, longitude

+45.78999, -110.06556   (decimal degrees)
45°47'24" N, 110°03'56" W   (degrees°minutes'seconds")

Approximate UTM coordinates

12/572628/5071138 (zone/easting/northing)

USGS topographic map

Carney

Inventory number

BH 23049 (Bridgehunter.com ID)

Inspection (as of 04/2005)

Deck condition rating: Satisfactory (6 out of 9)
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Poor (4 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 43.1 (out of 100)

Average daily traffic (as of 2003)

100

Categories 

Update Log 

• August 2, 2008: New photos from James Baughn

Sources 

• HAER MT-103 - Voges Bridge, Spanning Yellowstone River at Grey Bear Road, Big Timber vicinity, Sweet Grass County, MT
• HAER MT-22 - St. Mary River Bridge & Siphon, Spanning St. Mary River, Babb vicinity, Glacier County, MT
• James Baughn - webmaster [at] bridgehunter [dot] com

Comments