US Bridges

IRR - US 2 over Mosquito Creek

Fair

Roosevelt County, Montana · 1M E Wolf Point · Structure no. P00001591+06061

Built
1986
39 years old
Condition
Fair
inspected December 2024
Type
Culvert
Steel
Length
41 ft
3 main spans
Daily traffic
4,269
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - US 2 over Mosquito Creek is a steel culvert carrying IRR - US 2 over Mosquito Creek in Roosevelt County, Montana. It was built in 1986, so it is 39 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 4,269 vehicles a day, roughly 4% of them trucks, projected to reach 4,482 by 2043. The structure is 41 ft (12.4 m) long. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesIRR - US 2
CrossesMosquito Creek
Location1M E Wolf Point
RouteU.S. Route 2
CountyRoosevelt County
StateMontana
Coordinates48.10073, -105.62403
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadHS 20
Structure length41 ft (12.4 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,269 (2023)
Projected traffic4,482 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 IRR - US 2 over Mosquito Creek built?

It was built in 1986, making it 39 years old in 2025.

What condition is IRR - US 2 over Mosquito 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 December 2024.

How much traffic does IRR - US 2 over Mosquito Creek carry?

About 4,269 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is IRR - US 2 over Mosquito Creek?

The structure is 41 ft (12.4 m) long with a longest span of 11 ft (3.3 m).

Who owns IRR - US 2 over Mosquito Creek?

It is owned by the State Highway Agency.