US Bridges

S 59 over Road Creek-Stockpass

Good

Powder River County, Montana · 6M NW Broadus · Structure no. P00023072+09281

Built
2001
24 years old
Condition
Good
inspected September 2023
Type
Culvert
Steel
Length
20 ft
2 main spans
Daily traffic
742
2023 count
Owner
State
State Highway Agency

About this bridge

S 59 over Road Creek-Stockpass is a steel culvert carrying S 59 over Road Creek-Stockpass in Powder River County, Montana. It was built in 2001, so it is 24 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 742 vehicles a day, roughly 15% of them trucks, projected to reach 779 by 2043. The structure is 20 ft (6.1 m) long. If it were closed, the detour would be 85.1 mi (137 km).

CarriesS 59
CrossesRoad Creek-Stockpass
Location6M NW Broadus
RouteState Highway 59
StateMontana
Coordinates45.5018, -105.50588
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 protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 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 loadH 15
Structure length20 ft (6.1 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic742 (2023)
Projected traffic779 by 2043
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed85.1 mi (137 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 S 59 over Road Creek-Stockpass built?

It was built in 2001, making it 24 years old in 2025.

What condition is S 59 over Road Creek-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 September 2023.

How much traffic does S 59 over Road Creek-Stockpass carry?

About 742 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is S 59 over Road Creek-Stockpass?

The structure is 20 ft (6.1 m) long with a longest span of 8 ft (2.4 m).

Who owns S 59 over Road Creek-Stockpass?

It is owned by the State Highway Agency.