US Bridges

US 191-1st Ave N over Big Spring Creek

Fair

Fergus County, Montana · LEWISTOWN-1st Ave N · Structure no. P00043000+00851

Built
1960
65 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
34 ft
1 main span
Daily traffic
5,189
2023 count
Owner
State
State Highway Agency

About this bridge

US 191-1st Ave N over Big Spring Creek is a concrete slab carrying US 191-1st Ave N over Big Spring Creek in Fergus County, Montana. It was built in 1960, so it is 65 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 5,189 vehicles a day, roughly 3% of them trucks, projected to reach 5,448 by 2043. The structure is 34 ft (10.4 m) long and 70 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesUS 191-1st Ave N
CrossesBig Spring Creek
LocationLEWISTOWN-1st Ave N
RouteU.S. Route 191
CountyFergus County
StateMontana
Coordinates47.06778, -109.42519
Functional classUrban Other Principal Arterial

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 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 evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating29 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length34 ft (10.4 m)
Longest span34 ft (10.4 m)
Deck width70 ft (21.3 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,189 (2023)
Projected traffic5,448 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 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 191-1st Ave N over Big Spring Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is US 191-1st Ave N over Big Spring 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 September 2023.

How much traffic does US 191-1st Ave N over Big Spring Creek carry?

About 5,189 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is US 191-1st Ave N over Big Spring Creek?

The structure is 34 ft (10.4 m) long with a longest span of 34 ft (10.4 m) and a deck 70 ft wide.

Who owns US 191-1st Ave N over Big Spring Creek?

It is owned by the State Highway Agency.