US Bridges

US 89 FH 32 over Belt Creek

Good

Cascade County, Montana · 7M S Belt · Structure no. P00060066+03551

Built
1968
57 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
160 ft
3 main spans
Daily traffic
833
2023 count
Owner
State
State Highway Agency

About this bridge

US 89 FH 32 over Belt Creek is a prestressed concrete stringer/multi-beam or girder carrying US 89 FH 32 over Belt Creek in Cascade 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 833 vehicles a day, roughly 5% of them trucks, projected to reach 875 by 2043. The structure is 160 ft (48.8 m) long and 43 ft wide. If it were closed, the detour would be 23 mi (37 km).

CarriesUS 89 FH 32
CrossesBelt Creek
Location7M S Belt
RouteU.S. Route 89
StateMontana
Coordinates47.28213, -110.90444
Functional classRural Minor Arterial

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 inspectionSeptember 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 geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41 US tons
Inventory rating32 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length160 ft (48.8 m)
Longest span56 ft (17.2 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic833 (2023)
Projected traffic875 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed23 mi (37 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 US 89 FH 32 over Belt Creek built?

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

What condition is US 89 FH 32 over Belt 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 September 2023.

How much traffic does US 89 FH 32 over Belt Creek carry?

About 833 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is US 89 FH 32 over Belt Creek?

The structure is 160 ft (48.8 m) long with a longest span of 56 ft (17.2 m) and a deck 43 ft wide.

Who owns US 89 FH 32 over Belt Creek?

It is owned by the State Highway Agency.