US Bridges

Interstate 94 over Little Missouri R.

Fair

Billings County, North Dakota · West Medora Int · Structure no. 0094024315 R

Built
1964
61 years old, rebuilt 2002
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
695 ft
8 main spans
Daily traffic
1,300
2019 count
Owner
State
State Highway Agency

About this bridge

Interstate 94 over Little Missouri R. is a steel continuous stringer/multi-beam or girder carrying Interstate 94 over Little Missouri R. in Billings County, North Dakota. It was built in 1964 and reconstructed in 2002, so it is 61 years old, older than the North Dakota average of 48.2 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 1,300 vehicles a day, roughly 28% of them trucks, projected to reach 1,300 by 2039. The structure is 695 ft (211.8 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesInterstate 94
CrossesLittle Missouri R.
LocationWest Medora Int
RouteInterstate 94
Coordinates46.93088, -103.55009
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating45.1 US tons
Inventory rating27 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadH 20
Structure length695 ft (211.8 m)
Longest span90 ft (27.4 m)
Deck width36 ft (10.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,300 (2019)
Projected traffic1,300 by 2039
Trucks28%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Interstate 94 over Little Missouri R. built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2002.

What condition is Interstate 94 over Little Missouri R. 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 April 2023.

How much traffic does Interstate 94 over Little Missouri R. carry?

About 1,300 vehicles per day (2019 count), of which roughly 28% are trucks.

How long is Interstate 94 over Little Missouri R.?

The structure is 695 ft (211.8 m) long with a longest span of 90 ft (27.4 m) and a deck 36 ft wide.

Who owns Interstate 94 over Little Missouri R.?

It is owned by the State Highway Agency.