US Bridges

US 87 over Little Rock Cr-Stockpass

Good

Fergus County, Montana · 4M NE Moore · Structure no. P00057071+09321

Built
2009
16 years old
Condition
Good
inspected May 2023
Type
Culvert
Steel
Length
22 ft
2 main spans
Daily traffic
2,319
2023 count
Owner
State
State Highway Agency

About this bridge

US 87 over Little Rock Cr-Stockpass is a steel culvert carrying US 87 over Little Rock Cr-Stockpass in Fergus County, Montana. It was built in 2009, so it is 16 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 2,319 vehicles a day, roughly 6% of them trucks, projected to reach 2,435 by 2043. The structure is 22 ft (6.6 m) long. If it were closed, the detour would be 123.7 mi (199 km).

CarriesUS 87
CrossesLittle Rock Cr-Stockpass
Location4M NE Moore
RouteU.S. Route 87
StateMontana
Coordinates47.02003, -109.61731
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 spans2
Design loadHL 93
Structure length22 ft (6.6 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,319 (2023)
Projected traffic2,435 by 2043
Trucks6%
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 Little Rock Cr-Stockpass built?

It was built in 2009, making it 16 years old in 2025.

What condition is US 87 over Little Rock Cr-Stockpass 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 May 2023.

How much traffic does US 87 over Little Rock Cr-Stockpass carry?

About 2,319 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is US 87 over Little Rock Cr-Stockpass?

The structure is 22 ft (6.6 m) long with a longest span of 10 ft (3 m).

Who owns US 87 over Little Rock Cr-Stockpass?

It is owned by the State Highway Agency.