US Bridges

Fdr 1122 over Belt Creek

Fair

Cascade County, Montana · 0.1 MI W of Belt Cr. R.S. · Structure no. 011507000000033

Built
1972
53 years old, rebuilt 2016
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
58 ft
2 main spans
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 1122 over Belt Creek is a wood or timber stringer/multi-beam or girder carrying Fdr 1122 over Belt Creek in Cascade County, Montana. It was built in 1972 and reconstructed in 2016, so it is 53 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 58 ft (17.7 m) long and 14 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesFdr 1122
CrossesBelt Creek
Location0.1 MI W of Belt Cr. R.S.
RouteFederal Lands Road 1122
CountyCascade County
StateMontana
Coordinates47.00033, -110.76964
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating20.4 US tons
Inventory rating15.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 15
Structure length58 ft (17.7 m)
Longest span28 ft (8.6 m)
Deck width14 ft (4.2 m)
Roadway width12 ft (3.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Fdr 1122 over Belt Creek built?

It was built in 1972, making it 53 years old in 2025. It was reconstructed in 2016.

What condition is Fdr 1122 over Belt Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2024.

How much traffic does Fdr 1122 over Belt Creek carry?

About 50 vehicles per day (latest count).

How long is Fdr 1122 over Belt Creek?

The structure is 58 ft (17.7 m) long with a longest span of 28 ft (8.6 m) and a deck 14 ft wide.

Who owns Fdr 1122 over Belt Creek?

It is owned by the U.S. Forest Service.