US Bridges

US 89 FH 32 over Belt Creek

Good

Cascade County, Montana · 1M N Neihart · Structure no. P00060040+03761

Built
1951
74 years old
Condition
Good
inspected August 2023
Type
Tee Beam
Concrete Continuous
Length
100 ft
3 main spans
Daily traffic
451
2023 count
Owner
State
State Highway Agency

About this bridge

US 89 FH 32 over Belt Creek is a concrete continuous tee beam carrying US 89 FH 32 over Belt Creek in Cascade County, Montana. It was built in 1951, so it is 74 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 451 vehicles a day, roughly 10% of them trucks, projected to reach 474 by 2043. The structure is 100 ft (30.5 m) long and 30 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesUS 89 FH 32
CrossesBelt Creek
Location1M N Neihart
RouteU.S. Route 89
CountyCascade County
StateMontana
Coordinates46.97275, -110.75952
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating45 US tons
Inventory rating32 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span60 ft (18.3 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic451 (2023)
Projected traffic474 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 1951, making it 74 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 August 2023.

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

About 451 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is US 89 FH 32 over Belt Creek?

The structure is 100 ft (30.5 m) long with a longest span of 60 ft (18.3 m) and a deck 30 ft wide.

Who owns US 89 FH 32 over Belt Creek?

It is owned by the State Highway Agency.