US Bridges

I 94 over Sep County RD 300

Fair

Dawson County, Montana · 3M E Glendive · Structure no. I00094218+05881

Built
1980
45 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
113 ft
3 main spans
Daily traffic
2,109
2023 count
Owner
State
State Highway Agency

About this bridge

I 94 over Sep County RD 300 is a prestressed concrete stringer/multi-beam or girder carrying I 94 over Sep County RD 300 in Dawson County, Montana. It was built in 1980, so it is 45 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 2,109 vehicles a day, roughly 18% of them trucks, projected to reach 2,214 by 2043. The structure is 113 ft (34.4 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 94
CrossesSep County RD 300
Location3M E Glendive
RouteInterstate 94
CountyDawson County
StateMontana
Coordinates47.10878, -104.63459
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length113 ft (34.4 m)
Longest span40 ft (12.2 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,109 (2023)
Projected traffic2,214 by 2043
Trucks18%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
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 RD 300 built?

It was built in 1980, making it 45 years old in 2025.

What condition is I 94 over Sep County RD 300 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 RD 300 carry?

About 2,109 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is I 94 over Sep County RD 300?

The structure is 113 ft (34.4 m) long with a longest span of 40 ft (12.2 m) and a deck 44 ft wide.

Who owns I 94 over Sep County RD 300?

It is owned by the State Highway Agency.