US Bridges

Entrance Road over Belle Fourche River

Fair

Crook County, Wyoming · 26.6 Miles Northeast of I · Structure no. 1390001P0000000

Built
1980
45 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
300 ft
3 main spans
Daily traffic
1,000
2011 count
Owner
Federal
National Park Service

About this bridge

Entrance Road over Belle Fourche River is a concrete continuous box beam or girders - single or spread carrying Entrance Road over Belle Fourche River in Crook County, Wyoming. It was built in 1980, so it is 45 years old, younger than the Wyoming average of 48.4 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 1,000 vehicles a day, roughly 10% of them trucks, projected to reach 1,500 by 2031. The structure is 300 ft (91.4 m) long and 35 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesEntrance Road
CrossesBelle Fourche River
Location26.6 Miles Northeast of I
RouteU.S. Route 1390
CountyCrook County
StateWyoming
Coordinates44.58971, -104.70386
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating95 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length300 ft (91.4 m)
Longest span120 ft (36.6 m)
Deck width35 ft (10.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2011)
Projected traffic1,500 by 2031
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
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 Entrance Road over Belle Fourche River built?

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

What condition is Entrance Road over Belle Fourche River 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 October 2023.

How much traffic does Entrance Road over Belle Fourche River carry?

About 1,000 vehicles per day (2011 count), of which roughly 10% are trucks.

How long is Entrance Road over Belle Fourche River?

The structure is 300 ft (91.4 m) long with a longest span of 120 ft (36.6 m) and a deck 35 ft wide.

Who owns Entrance Road over Belle Fourche River?

It is owned by the National Park Service.