US Bridges

Fdr over South Fork Boise River

Fair

Camas County, Idaho · Mouth Big Smoky Creek · Structure no. 041405000001083

Built
1951
74 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
67 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Fdr over South Fork Boise River is a steel stringer/multi-beam or girder carrying Fdr over South Fork Boise River in Camas County, Idaho. It was built in 1951, so it is 74 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 5 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, projected to reach 75 by 2045. The structure is 67 ft (20.4 m) long and 13 ft wide.

Location

Open in Google Maps
CarriesFdr
CrossesSouth Fork Boise River
LocationMouth Big Smoky Creek
RouteCounty Highway 70227
CountyCamas County
StateIdaho
Coordinates43.60435, -114.91517
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.7 US tons
Inventory rating20 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadH 20
Structure length67 ft (20.4 m)
Longest span65 ft (19.8 m)
Deck width13 ft (4 m)
Roadway width13 ft (4 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Fdr over South Fork Boise River built?

It was built in 1951, making it 74 years old in 2025.

What condition is Fdr over South Fork Boise River 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 Fdr over South Fork Boise River carry?

About 50 vehicles per day (latest count).

How long is Fdr over South Fork Boise River?

The structure is 67 ft (20.4 m) long with a longest span of 65 ft (19.8 m) and a deck 13 ft wide.

Who owns Fdr over South Fork Boise River?

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