US Bridges

S 239 over Judith River

Good

Judith Basin County, Montana · 2M W Hobson · Structure no. S00239003+01001

Built
1961
64 years old, rebuilt 2008
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
65 ft
1 main span
Daily traffic
324
2023 count
Owner
State
State Highway Agency

About this bridge

S 239 over Judith River is a prestressed concrete stringer/multi-beam or girder carrying S 239 over Judith River in Judith Basin County, Montana. It was built in 1961 and reconstructed in 2008, so it is 64 years old, older 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 324 vehicles a day, roughly 11% of them trucks, projected to reach 348 by 2043. The structure is 65 ft (19.8 m) long and 26 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesS 239
CrossesJudith River
Location2M W Hobson
RouteState Highway 239
StateMontana
Coordinates46.99747, -109.92603
Functional classRural Major Collector

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 protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating25 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length65 ft (19.8 m)
Longest span65 ft (19.8 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic324 (2023)
Projected traffic348 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 239 over Judith River built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 2008.

What condition is S 239 over Judith River 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 June 2024.

How much traffic does S 239 over Judith River carry?

About 324 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is S 239 over Judith River?

The structure is 65 ft (19.8 m) long with a longest span of 65 ft (19.8 m) and a deck 26 ft wide.

Who owns S 239 over Judith River?

It is owned by the State Highway Agency.