US Bridges

NFSR 100 over Medicine Bow River

FairPosted for load

Carbon County, Wyoming · 19.4 Mi. NE of SH 130 · Structure no. 020602000001221

Built
1952
73 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
47 ft
2 main spans
Daily traffic
68
2002 count
Owner
Federal
U.S. Forest Service

About this bridge

NFSR 100 over Medicine Bow River is a wood or timber stringer/multi-beam or girder carrying NFSR 100 over Medicine Bow River in Carbon County, Wyoming. It was built in 1952, so it is 73 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 68 vehicles a day, projected to reach 102 by 2045. The structure is 47 ft (14.3 m) long and 15 ft wide. If it were closed, the detour would be 620.7 mi (999 km).

Location

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CarriesNFSR 100
CrossesMedicine Bow River
Location19.4 Mi. NE of SH 130
RouteFederal Lands Road 100
CountyCarbon County
StateWyoming
Coordinates41.51465, -106.37103
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating35.4 US tons
Inventory rating27.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20
Structure length47 ft (14.3 m)
Longest span23 ft (7 m)
Deck width15 ft (4.7 m)
Roadway width14 ft (4.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic68 (2002)
Projected traffic102 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed620.7 mi (999 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was NFSR 100 over Medicine Bow River built?

It was built in 1952, making it 73 years old in 2025.

What condition is NFSR 100 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 August 2024.

How much traffic does NFSR 100 over Medicine Bow River carry?

About 68 vehicles per day (2002 count).

How long is NFSR 100 over Medicine Bow River?

The structure is 47 ft (14.3 m) long with a longest span of 23 ft (7 m) and a deck 15 ft wide.

Who owns NFSR 100 over Medicine Bow River?

It is owned by the U.S. Forest Service.