US Bridges

US 87 over Park Coulee

Good

Musselshell County, Montana · 16M S Klein · Structure no. P00016029+03001

Built
1995
30 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
67 ft
1 main span
Daily traffic
2,548
2023 count
Owner
State
State Highway Agency

About this bridge

US 87 over Park Coulee is a prestressed concrete stringer/multi-beam or girder carrying US 87 over Park Coulee in Musselshell County, Montana. It was built in 1995, so it is 30 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 2,548 vehicles a day, roughly 5% of them trucks, projected to reach 2,675 by 2043. The structure is 67 ft (20.4 m) long and 42 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesUS 87
CrossesPark Coulee
Location16M S Klein
RouteU.S. Route 87
StateMontana
Coordinates46.19064, -108.45257
Functional classRural Principal Arterial - Other

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating58 US tons
Inventory rating44 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length67 ft (20.4 m)
Longest span65 ft (19.8 m)
Deck width42 ft (12.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,548 (2023)
Projected traffic2,675 by 2043
Trucks5%
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 US 87 over Park Coulee built?

It was built in 1995, making it 30 years old in 2025.

What condition is US 87 over Park 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 October 2024.

How much traffic does US 87 over Park Coulee carry?

About 2,548 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is US 87 over Park Coulee?

The structure is 67 ft (20.4 m) long with a longest span of 65 ft (19.8 m) and a deck 42 ft wide.

Who owns US 87 over Park Coulee?

It is owned by the State Highway Agency.