US Bridges

STC3892;INDIAN Vly over Grays Creek

FairPosted for load

Adams County, Idaho · 1.9N. 0.5W. Indian Valley · Structure no. 000000000020045

Built
1930
95 years old, rebuilt 1965
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
27 ft
1 main span
Daily traffic
160
2023 count
Owner
County
County Highway Agency

About this bridge

STC3892;INDIAN Vly over Grays Creek is a prestressed concrete stringer/multi-beam or girder carrying STC3892;INDIAN Vly over Grays Creek in Adams County, Idaho. It was built in 1930 and reconstructed in 1965, so it is 95 years old, older than the Idaho average of 45.3 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 160 vehicles a day, roughly 14% of them trucks, projected to reach 240 by 2042. The structure is 27 ft (8.2 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSTC3892;INDIAN Vly
CrossesGrays Creek
Location1.9N. 0.5W. Indian Valley
RouteCounty Highway 3892
StateIdaho
Coordinates44.58472, -116.44331
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 inspectionSeptember 2023
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34 US tons
Inventory rating25 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length27 ft (8.2 m)
Longest span26 ft (7.9 m)
Deck width28 ft (8.6 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic160 (2023)
Projected traffic240 by 2042
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 STC3892;INDIAN Vly over Grays Creek built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1965.

What condition is STC3892;INDIAN Vly over Grays 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 2023.

How much traffic does STC3892;INDIAN Vly over Grays Creek carry?

About 160 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is STC3892;INDIAN Vly over Grays Creek?

The structure is 27 ft (8.2 m) long with a longest span of 26 ft (7.9 m) and a deck 28 ft wide.

Who owns STC3892;INDIAN Vly over Grays Creek?

It is owned by the County Highway Agency.