US Bridges

4638: Scotchman Gu over Upper Willow Creek

Fair

Granite County, Montana · 14 MI W of MT1/US10A · Structure no. 000000000L59187

Built
1980
45 years old
Condition
Fair
inspected August 2024
Type
Slab
Prestressed Concrete
Length
41 ft
1 main span
Daily traffic
25
2022 count
Owner
Federal
Bureau of Land Management

About this bridge

4638: Scotchman Gu over Upper Willow Creek is a prestressed concrete slab carrying 4638: Scotchman Gu over Upper Willow Creek in Granite County, Montana. It was built in 1980, so it is 45 years old, younger 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 25 vehicles a day, projected to reach 35 by 2040. The structure is 41 ft (12.5 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
Carries4638: Scotchman Gu
CrossesUpper Willow Creek
Location14 MI W of MT1/US10A
RouteFederal Lands Road 0
CountyGranite County
StateMontana
Coordinates46.36694, -113.49917
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating31.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span38 ft (11.6 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2022)
Projected traffic35 by 2040
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Land Management
Maintained byBureau of Land Management
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 4638: Scotchman Gu over Upper Willow Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is 4638: Scotchman Gu over Upper Willow 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 August 2024.

How much traffic does 4638: Scotchman Gu over Upper Willow Creek carry?

About 25 vehicles per day (2022 count).

How long is 4638: Scotchman Gu over Upper Willow Creek?

The structure is 41 ft (12.5 m) long with a longest span of 38 ft (11.6 m) and a deck 16 ft wide.

Who owns 4638: Scotchman Gu over Upper Willow Creek?

It is owned by the Bureau of Land Management.