US Bridges

US 12 over East Spring Coulee

Good

Rosebud County, Montana · 11M NW Forsyth · Structure no. P00014259+08241

Built
2012
13 years old
Condition
Good
inspected August 2024
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
214
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over East Spring Coulee is a concrete culvert carrying US 12 over East Spring Coulee in Rosebud County, Montana. It was built in 2012, so it is 13 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 214 vehicles a day, roughly 15% of them trucks, projected to reach 225 by 2043. The structure is 25 ft (7.5 m) long. If it were closed, the detour would be 123.7 mi (199 km).

CarriesUS 12
CrossesEast Spring Coulee
Location11M NW Forsyth
RouteU.S. Route 12
StateMontana
Coordinates46.34036, -106.87711
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating29 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 25 or greater
Structure length25 ft (7.5 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic214 (2023)
Projected traffic225 by 2043
Trucks15%
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 East Spring Coulee built?

It was built in 2012, making it 13 years old in 2025.

What condition is US 12 over East Spring Coulee in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does US 12 over East Spring Coulee carry?

About 214 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is US 12 over East Spring Coulee?

The structure is 25 ft (7.5 m) long with a longest span of 12 ft (3.7 m).

Who owns US 12 over East Spring Coulee?

It is owned by the State Highway Agency.