US Bridges

Forest Road 30400 over Horsetail Creek

Fair

Teton County, Wyoming · 17 Mi. Ne. of Jackson · Structure no. 040304000015047

Built
1997
28 years old
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
32 ft
1 main span
Daily traffic
450
2018 count
Owner
Federal
U.S. Forest Service

About this bridge

Forest Road 30400 over Horsetail Creek is a concrete continuous box beam or girders - multiple carrying Forest Road 30400 over Horsetail Creek in Teton County, Wyoming. It was built in 1997, so it is 28 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 450 vehicles a day, roughly 10% of them trucks, projected to reach 675 by 2045. The structure is 32 ft (9.7 m) long and 28 ft wide. If it were closed, the detour would be 620.7 mi (999 km).

Location

Open in Google Maps
CarriesForest Road 30400
CrossesHorsetail Creek
Location17 Mi. Ne. of Jackson
RouteFederal Lands Road 30400
CountyTeton County
StateWyoming
Coordinates43.63612, -110.49759
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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation*: *
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 rating—
Inventory rating—

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length32 ft (9.7 m)
Longest span30 ft (9.1 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic450 (2018)
Projected traffic675 by 2045
Trucks10%
Lanes on structure2
Traffic directionTwo-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 Forest Road 30400 over Horsetail Creek built?

It was built in 1997, making it 28 years old in 2025.

What condition is Forest Road 30400 over Horsetail 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 September 2024.

How much traffic does Forest Road 30400 over Horsetail Creek carry?

About 450 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is Forest Road 30400 over Horsetail Creek?

The structure is 32 ft (9.7 m) long with a longest span of 30 ft (9.1 m) and a deck 28 ft wide.

Who owns Forest Road 30400 over Horsetail Creek?

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