US Bridges

N.Fk. Boise R. Rd. over Crooked River

Good

Boise County, Idaho · 3 MI N of Barber Flat · Structure no. 040203000001054

Built
1957
68 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
106 ft
1 main span
Daily traffic
40
2018 count
Owner
Federal
U.S. Forest Service

About this bridge

N.Fk. Boise R. Rd. over Crooked River is a concrete stringer/multi-beam or girder carrying N.Fk. Boise R. Rd. over Crooked River in Boise County, Idaho. It was built in 1957, so it is 68 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 40 vehicles a day, projected to reach 60 by 2045. The structure is 106 ft (32.3 m) long and 27 ft wide. If it were closed, the detour would be 36.7 mi (59 km).

Location

Open in Google Maps
CarriesN.Fk. Boise R. Rd.
CrossesCrooked River
Location3 MI N of Barber Flat
RouteFederal Lands Road 327
CountyBoise County
StateIdaho
Coordinates43.85263, -115.53742
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 48 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 geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27.9 US tons
Inventory rating21.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length106 ft (32.3 m)
Longest span68 ft (20.7 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2018)
Projected traffic60 by 2045
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed36.7 mi (59 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 N.Fk. Boise R. Rd. over Crooked River built?

It was built in 1957, making it 68 years old in 2025.

What condition is N.Fk. Boise R. Rd. over Crooked River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does N.Fk. Boise R. Rd. over Crooked River carry?

About 40 vehicles per day (2018 count).

How long is N.Fk. Boise R. Rd. over Crooked River?

The structure is 106 ft (32.3 m) long with a longest span of 68 ft (20.7 m) and a deck 27 ft wide.

Who owns N.Fk. Boise R. Rd. over Crooked River?

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