US Bridges

US 12 over Deep Creek

Fair

Broadwater County, Montana · 16M E Townsend · Structure no. P00014017+03281

Built
2014
11 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Prestressed Concrete
Length
55 ft
1 main span
Daily traffic
720
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Deep Creek is a prestressed concrete tee beam carrying US 12 over Deep Creek in Broadwater County, Montana. It was built in 2014, so it is 11 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 720 vehicles a day, roughly 9% of them trucks, projected to reach 756 by 2043. The structure is 55 ft (16.8 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesUS 12
CrossesDeep Creek
Location16M E Townsend
RouteU.S. Route 12
CountyBroadwater County
StateMontana
Coordinates46.33309, -111.17548
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating31 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadH 15
Structure length55 ft (16.8 m)
Longest span54 ft (16.5 m)
Deck width32 ft (9.7 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic720 (2023)
Projected traffic756 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

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 12 over Deep Creek built?

It was built in 2014, making it 11 years old in 2025.

What condition is US 12 over Deep 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 March 2023.

How much traffic does US 12 over Deep Creek carry?

About 720 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is US 12 over Deep Creek?

The structure is 55 ft (16.8 m) long with a longest span of 54 ft (16.5 m) and a deck 32 ft wide.

Who owns US 12 over Deep Creek?

It is owned by the State Highway Agency.