US Bridges

Access Road over Boysen Dam Spillway

FairPosted for load

Fremont County, Wyoming · 15.9 MI S. of Thermopolis · Structure no. WYA-BU-001

Built
1948
77 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Concrete
Length
71 ft
2 main spans
Daily traffic
5
2015 count
Owner
Federal
Bureau of Reclamation

About this bridge

Access Road over Boysen Dam Spillway is a concrete tee beam carrying Access Road over Boysen Dam Spillway in Fremont County, Wyoming. It was built in 1948, so it is 77 years old, older 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. Its operating status is: posted for load restriction.

It carries about 5 vehicles a day, projected to reach 10 by 2042. The structure is 71 ft (21.5 m) long and 14 ft wide. If it were closed, the detour would be 198.8 mi (320 km).

Location

Open in Google Maps
CarriesAccess Road
CrossesBoysen Dam Spillway
Location15.9 MI S. of Thermopolis
RouteCounty Highway 0
CountyFremont County
StateWyoming
Coordinates43.41669, -108.17766
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 protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating38.7 US tons
Inventory rating22.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length71 ft (21.5 m)
Longest span33 ft (10 m)
Deck width14 ft (4.3 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2015)
Projected traffic10 by 2042
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed198.8 mi (320 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Reclamation
Maintained byBureau of Reclamation
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Access Road over Boysen Dam Spillway built?

It was built in 1948, making it 77 years old in 2025.

What condition is Access Road over Boysen Dam Spillway 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 November 2023.

How much traffic does Access Road over Boysen Dam Spillway carry?

About 5 vehicles per day (2015 count).

How long is Access Road over Boysen Dam Spillway?

The structure is 71 ft (21.5 m) long with a longest span of 33 ft (10 m) and a deck 14 ft wide.

Who owns Access Road over Boysen Dam Spillway?

It is owned by the Bureau of Reclamation.