US Bridges

I 94 over Sep County Road

Fair

Dawson County, Montana · 18M SE Glendive · Structure no. I00094233+05262

Built
1977
48 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
78 ft
3 main spans
Daily traffic
2,188
2023 count
Owner
State
State Highway Agency

About this bridge

I 94 over Sep County Road is a concrete continuous slab carrying I 94 over Sep County Road in Dawson County, Montana. It was built in 1977, so it is 48 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 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 2,188 vehicles a day, roughly 17% of them trucks, projected to reach 2,297 by 2043. The structure is 78 ft (23.8 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesI 94
CrossesSep County Road
Location18M SE Glendive
RouteInterstate 94
CountyDawson County
StateMontana
Coordinates47.0334, -104.3503
Functional classRural Principal Arterial - Interstate

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating31 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length78 ft (23.8 m)
Longest span30 ft (9.1 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,188 (2023)
Projected traffic2,297 by 2043
Trucks17%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I 94 over Sep County Road built?

It was built in 1977, making it 48 years old in 2025.

What condition is I 94 over Sep County Road 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 May 2023.

How much traffic does I 94 over Sep County Road carry?

About 2,188 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is I 94 over Sep County Road?

The structure is 78 ft (23.8 m) long with a longest span of 30 ft (9.1 m) and a deck 44 ft wide.

Who owns I 94 over Sep County Road?

It is owned by the State Highway Agency.