US Bridges

Leon Road over Union Flat Creek

FairPosted for load

Nez Perce County, Idaho · 1.5 S. 5.3 W. Genesee · Structure no. 000000000029925

Built
1938
87 years old, rebuilt 1962
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
50 ft
1 main span
Daily traffic
40
2023 count
Owner
County
County Highway Agency

About this bridge

Leon Road over Union Flat Creek is a steel stringer/multi-beam or girder carrying Leon Road over Union Flat Creek in Nez Perce County, Idaho. It was built in 1938 and reconstructed in 1962, so it is 87 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 40 vehicles a day, roughly 10% of them trucks, projected to reach 60 by 2039. The structure is 50 ft (15.2 m) long and 24 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesLeon Road
CrossesUnion Flat Creek
Location1.5 S. 5.3 W. Genesee
RouteCounty Highway 0
CountyNez Perce County
StateIdaho
Coordinates46.53119, -117.03964
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27 US tons
Inventory rating16 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadH 20
Structure length50 ft (15.2 m)
Longest span49 ft (14.9 m)
Deck width24 ft (7.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2023)
Projected traffic60 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$589,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Leon Road over Union Flat Creek built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1962.

What condition is Leon Road over Union Flat 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 May 2023.

How much traffic does Leon Road over Union Flat Creek carry?

About 40 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Leon Road over Union Flat Creek?

The structure is 50 ft (15.2 m) long with a longest span of 49 ft (14.9 m) and a deck 24 ft wide.

Who owns Leon Road over Union Flat Creek?

It is owned by the County Highway Agency.