US Bridges

Wyo 31 over Medicine Lodge Creek

FairPosted for load

Big Horn County, Wyoming · Manderson - Hyattville · Structure no. CJI

Built
1948
77 years old
Condition
Fair
inspected February 2025
Type
Slab
Concrete
Length
51 ft
3 main spans
Daily traffic
216
2024 count
Owner
State
State Highway Agency

About this bridge

Wyo 31 over Medicine Lodge Creek is a concrete slab carrying Wyo 31 over Medicine Lodge Creek in Big Horn 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 216 vehicles a day, roughly 4% of them trucks, projected to reach 302 by 2043. The structure is 51 ft (15.5 m) long and 31 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesWyo 31
CrossesMedicine Lodge Creek
LocationManderson - Hyattville
RouteState Highway 31
CountyBig Horn County
StateWyoming
Coordinates44.24775, -107.60285
Functional classRural Major Collector

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 protection8 Very GoodNo problems noted.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 alignment8: Equal to present desirable criteria
Operating rating42.8 US tons
Inventory rating25.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length51 ft (15.5 m)
Longest span17 ft (5.2 m)
Deck width31 ft (9.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic216 (2024)
Projected traffic302 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Wyo 31 over Medicine Lodge Creek built?

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

What condition is Wyo 31 over Medicine Lodge Creek 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 February 2025.

How much traffic does Wyo 31 over Medicine Lodge Creek carry?

About 216 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Wyo 31 over Medicine Lodge Creek?

The structure is 51 ft (15.5 m) long with a longest span of 17 ft (5.2 m) and a deck 31 ft wide.

Who owns Wyo 31 over Medicine Lodge Creek?

It is owned by the State Highway Agency.