US Bridges

Forest Road 30980 over Mosquito Creek

Poor

Teton County, Wyoming · 8 Mi. Sw. of Jackson Wy · Structure no. 040304000001076

Built
1956
69 years old
Condition
Poor
inspected October 2023
Type
Girder and Floorbeam System
Steel
Length
40 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Forest Road 30980 over Mosquito Creek is a steel girder and floorbeam system carrying Forest Road 30980 over Mosquito Creek in Teton County, Wyoming. It was built in 1956, so it is 69 years old, older than the Wyoming average of 48.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 40 ft (12.2 m) long and 15 ft wide.

Location

Open in Google Maps
CarriesForest Road 30980
CrossesMosquito Creek
Location8 Mi. Sw. of Jackson Wy
RouteFederal Lands Road 30980
CountyTeton County
StateWyoming
Coordinates43.43289, -110.90787
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation*: *
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating—
Inventory rating—

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckSteel plate
Main spans1
Design loadHS 15
Structure length40 ft (12.2 m)
Longest span0 ft (0 m)
Deck width15 ft (4.6 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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$81,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Forest Road 30980 over Mosquito Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is Forest Road 30980 over Mosquito Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2023.

How much traffic does Forest Road 30980 over Mosquito Creek carry?

About 50 vehicles per day (latest count).

How long is Forest Road 30980 over Mosquito Creek?

The structure is 40 ft (12.2 m) long and a deck 15 ft wide.

Who owns Forest Road 30980 over Mosquito Creek?

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