US Bridges

S 97 over Int W Wibaux-I 94

Fair

Wibaux County, Montana · NW of Wibaux · Structure no. P00097000+03441

Built
1962
63 years old, rebuilt 1974
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
240 ft
4 main spans
Daily traffic
263
2023 count
Owner
State
State Highway Agency

About this bridge

S 97 over Int W Wibaux-I 94 is a prestressed concrete stringer/multi-beam or girder carrying S 97 over Int W Wibaux-I 94 in Wibaux County, Montana. It was built in 1962 and reconstructed in 1974, so it is 63 years old, older 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 5 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 263 vehicles a day, roughly 7% of them trucks, projected to reach 276 by 2043. The structure is 240 ft (73.3 m) long and 27 ft wide.

Location

Open in Google Maps
CarriesS 97
CrossesInt W Wibaux-I 94
LocationNW of Wibaux
RouteState Highway 261
CountyWibaux County
StateMontana
Coordinates46.99353, -104.19103
Functional classRural Major Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating42 US tons
Inventory rating24 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length240 ft (73.3 m)
Longest span76 ft (23.2 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic263 (2023)
Projected traffic276 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was S 97 over Int W Wibaux-I 94 built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1974.

What condition is S 97 over Int W Wibaux-I 94 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 June 2023.

How much traffic does S 97 over Int W Wibaux-I 94 carry?

About 263 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is S 97 over Int W Wibaux-I 94?

The structure is 240 ft (73.3 m) long with a longest span of 76 ft (23.2 m) and a deck 27 ft wide.

Who owns S 97 over Int W Wibaux-I 94?

It is owned by the State Highway Agency.