US Bridges

IRR - S 358 over Spring Creek

Good

Glacier County, Montana · 5M S Cut Bank · Structure no. S00358024+04751

Built
1968
57 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
94 ft
2 main spans
Daily traffic
267
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - S 358 over Spring Creek is a prestressed concrete stringer/multi-beam or girder carrying IRR - S 358 over Spring Creek in Glacier County, Montana. It was built in 1968, so it is 57 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 267 vehicles a day, roughly 8% of them trucks, projected to reach 280 by 2043. The structure is 94 ft (28.7 m) long and 36 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

Location

Open in Google Maps
CarriesIRR - S 358
CrossesSpring Creek
Location5M S Cut Bank
RouteState Highway 358
CountyGlacier County
StateMontana
Coordinates48.58132, -112.36241
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 15
Structure length94 ft (28.7 m)
Longest span46 ft (13.9 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic267 (2023)
Projected traffic280 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.1 mi (50 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR - S 358 over Spring Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is IRR - S 358 over Spring Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does IRR - S 358 over Spring Creek carry?

About 267 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is IRR - S 358 over Spring Creek?

The structure is 94 ft (28.7 m) long with a longest span of 46 ft (13.9 m) and a deck 36 ft wide.

Who owns IRR - S 358 over Spring Creek?

It is owned by the State Highway Agency.