US Bridges

Cb Cnty RD 320 over Medicine Bow River

FairPosted for load

Carbon County, Wyoming · 14 MI S. of Medicine Bow · Structure no. FPD

Built
1989
36 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
62 ft
1 main span
Daily traffic
11
2024 count
Owner
County
County Highway Agency

About this bridge

Cb Cnty RD 320 over Medicine Bow River is a steel stringer/multi-beam or girder carrying Cb Cnty RD 320 over Medicine Bow River in Carbon County, Wyoming. It was built in 1989, so it is 36 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 5 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 11 vehicles a day, projected to reach 15 by 2043. The structure is 62 ft (18.9 m) long and 29 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesCb Cnty RD 320
CrossesMedicine Bow River
Location14 MI S. of Medicine Bow
RouteCounty Highway 320
CountyCarbon County
StateWyoming
Coordinates41.77305, -106.20621
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span61 ft (18.7 m)
Deck width29 ft (8.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11 (2024)
Projected traffic15 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$48,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Cb Cnty RD 320 over Medicine Bow River built?

It was built in 1989, making it 36 years old in 2025.

What condition is Cb Cnty RD 320 over Medicine Bow 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 Cb Cnty RD 320 over Medicine Bow River carry?

About 11 vehicles per day (2024 count).

How long is Cb Cnty RD 320 over Medicine Bow River?

The structure is 62 ft (18.9 m) long with a longest span of 61 ft (18.7 m) and a deck 29 ft wide.

Who owns Cb Cnty RD 320 over Medicine Bow River?

It is owned by the County Highway Agency.