US Bridges

US 191 over Box Elder Creek

Poor

Fergus County, Montana · 2M E Roy · Structure no. P00043037+09021

Built
1942
83 years old, rebuilt 1962
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
58 ft
3 main spans
Daily traffic
382
2023 count
Owner
State
State Highway Agency

About this bridge

US 191 over Box Elder Creek is a wood or timber stringer/multi-beam or girder carrying US 191 over Box Elder Creek in Fergus County, Montana. It was built in 1942 and reconstructed in 1962, so it is 83 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 382 vehicles a day, roughly 6% of them trucks, projected to reach 401 by 2043. The structure is 58 ft (17.6 m) long and 38 ft wide. If it were closed, the detour would be 93.8 mi (151 km).

CarriesUS 191
CrossesBox Elder Creek
Location2M E Roy
RouteU.S. Route 191
StateMontana
Coordinates47.33738, -108.90575
Functional classRural Principal Arterial - Other

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46 US tons
Inventory rating32 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadH 15
Structure length58 ft (17.6 m)
Longest span19 ft (5.8 m)
Deck width38 ft (11.6 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic382 (2023)
Projected traffic401 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed93.8 mi (151 km)
TollOn a free road
National Highway SystemYes

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 191 over Box Elder Creek built?

It was built in 1942, making it 83 years old in 2025. It was reconstructed in 1962.

What condition is US 191 over Box Elder Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does US 191 over Box Elder Creek carry?

About 382 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is US 191 over Box Elder Creek?

The structure is 58 ft (17.6 m) long with a longest span of 19 ft (5.8 m) and a deck 38 ft wide.

Who owns US 191 over Box Elder Creek?

It is owned by the State Highway Agency.