US Bridges

Big Flat Road over S.Fk.Crane Creek

Fair

Washington County, Idaho · 10.6 S. 8.8 E. Midvale · Structure no. 000000000028935

Built
1991
34 years old
Condition
Fair
inspected June 2021
Type
Culvert
Steel
Length
23 ft
2 main spans
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

Big Flat Road over S.Fk.Crane Creek is a steel culvert carrying Big Flat Road over S.Fk.Crane Creek in Washington County, Idaho. It was built in 1991, so it is 34 years old, younger 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.

It carries about 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2039. The structure is 23 ft (7 m) long and 50 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesBig Flat Road
CrossesS.Fk.Crane Creek
Location10.6 S. 8.8 E. Midvale
RouteCounty Highway 0
CountyWashington County
StateIdaho
Coordinates44.31747, -116.55474
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length23 ft (7 m)
Longest span10 ft (3 m)
Deck width50 ft (15.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 Big Flat Road over S.Fk.Crane Creek built?

It was built in 1991, making it 34 years old in 2025.

What condition is Big Flat Road over S.Fk.Crane 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 June 2021.

How much traffic does Big Flat Road over S.Fk.Crane Creek carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Big Flat Road over S.Fk.Crane Creek?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3 m) and a deck 50 ft wide.

Who owns Big Flat Road over S.Fk.Crane Creek?

It is owned by the County Highway Agency.