US Bridges

Tebay LN over Jefferson Slough 014

Fair

Jefferson County, Montana · 3M W Cardwell · Structure no. L22522000+03001

Built
1991
34 years old
Condition
Fair
inspected January 2025
Type
Tee Beam
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
180
2023 count
Owner
County
County Highway Agency

About this bridge

Tebay LN over Jefferson Slough 014 is a prestressed concrete tee beam carrying Tebay LN over Jefferson Slough 014 in Jefferson County, Montana. It was built in 1991, so it is 34 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 180 vehicles a day, roughly 3% of them trucks, projected to reach 193 by 2043. The structure is 31 ft (9.4 m) long and 29 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesTebay LN
CrossesJefferson Slough 014
Location3M W Cardwell
RouteCounty Highway 22522
CountyJefferson County
StateMontana
Coordinates45.87076, -112.01291
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span22 ft (6.7 m)
Deck width29 ft (8.8 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180 (2023)
Projected traffic193 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Tebay LN over Jefferson Slough 014 built?

It was built in 1991, making it 34 years old in 2025.

What condition is Tebay LN over Jefferson Slough 014 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 January 2025.

How much traffic does Tebay LN over Jefferson Slough 014 carry?

About 180 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Tebay LN over Jefferson Slough 014?

The structure is 31 ft (9.4 m) long with a longest span of 22 ft (6.7 m) and a deck 29 ft wide.

Who owns Tebay LN over Jefferson Slough 014?

It is owned by the County Highway Agency.