US Bridges

Wa Cnty RD 580A over Nowood River

FairPosted for load

Washakie County, Wyoming · 1 MI S.W. of Tensleep · Structure no. FML

Built
1935
90 years old
Condition
Fair
inspected May 2024
Type
Truss - Thru
Steel
Length
201 ft
1 main span
Daily traffic
16
2024 count
Owner
County
County Highway Agency

About this bridge

Wa Cnty RD 580A over Nowood River is a steel truss - thru carrying Wa Cnty RD 580A over Nowood River in Washakie County, Wyoming. It was built in 1935, so it is 90 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 16 vehicles a day, roughly 6% of them trucks, projected to reach 22 by 2043. The structure is 201 ft (61.3 m) long and 27 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

CarriesWa Cnty RD 580A
CrossesNowood River
Location1 MI S.W. of Tensleep
RouteCounty Highway 580A
StateWyoming
Coordinates44.0304, -107.46304
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39.4 US tons
Inventory rating23.8 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadH 15
Structure length201 ft (61.3 m)
Longest span100 ft (30.5 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16 (2024)
Projected traffic22 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Wa Cnty RD 580A over Nowood River built?

It was built in 1935, making it 90 years old in 2025.

What condition is Wa Cnty RD 580A over Nowood 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 May 2024.

How much traffic does Wa Cnty RD 580A over Nowood River carry?

About 16 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is Wa Cnty RD 580A over Nowood River?

The structure is 201 ft (61.3 m) long with a longest span of 100 ft (30.5 m) and a deck 27 ft wide.

Who owns Wa Cnty RD 580A over Nowood River?

It is owned by the County Highway Agency.