US Bridges

S 13 over Wolf Creek

Fair

McCone County, Montana · 2M S Vida · Structure no. P00025027+07631

Built
1993
32 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
76 ft
1 main span
Daily traffic
901
2023 count
Owner
State
State Highway Agency

About this bridge

S 13 over Wolf Creek is a prestressed concrete stringer/multi-beam or girder carrying S 13 over Wolf Creek in McCone County, Montana. It was built in 1993, so it is 32 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 901 vehicles a day, roughly 17% of them trucks, projected to reach 946 by 2043. The structure is 76 ft (23.2 m) long and 38 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesS 13
CrossesWolf Creek
Location2M S Vida
RouteState Highway 13
StateMontana
Coordinates47.80203, -105.49167
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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating32 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length76 ft (23.2 m)
Longest span75 ft (22.9 m)
Deck width38 ft (11.7 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic901 (2023)
Projected traffic946 by 2043
Trucks17%
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 S 13 over Wolf Creek built?

It was built in 1993, making it 32 years old in 2025.

What condition is S 13 over Wolf 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 S 13 over Wolf Creek carry?

About 901 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is S 13 over Wolf Creek?

The structure is 76 ft (23.2 m) long with a longest span of 75 ft (22.9 m) and a deck 38 ft wide.

Who owns S 13 over Wolf Creek?

It is owned by the State Highway Agency.