US Bridges

SH 51 over West Bruneau Rvr Slough

Good

Owyhee County, Idaho · 1.0 W. Bruneau · Structure no. 000000000014540

Built
1955
70 years old
Condition
Good
inspected February 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
35 ft
1 main span
Daily traffic
1,500
2023 count
Owner
State
State Highway Agency

About this bridge

SH 51 over West Bruneau Rvr Slough is a concrete stringer/multi-beam or girder carrying SH 51 over West Bruneau Rvr Slough in Owyhee County, Idaho. It was built in 1955, so it is 70 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 1,500 vehicles a day, roughly 8% of them trucks, projected to reach 2,250 by 2042. The structure is 35 ft (10.7 m) long and 29 ft wide. If it were closed, the detour would be 37.3 mi (60 km).

CarriesSH 51
CrossesWest Bruneau Rvr Slough
Location1.0 W. Bruneau
RouteState Highway 51
StateIdaho
Coordinates42.88038, -115.82418
Functional classRural Minor Arterial

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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating34 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length35 ft (10.7 m)
Longest span34 ft (10.4 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,500 (2023)
Projected traffic2,250 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed37.3 mi (60 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$554,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 51 over West Bruneau Rvr Slough built?

It was built in 1955, making it 70 years old in 2025.

What condition is SH 51 over West Bruneau Rvr Slough 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 February 2023.

How much traffic does SH 51 over West Bruneau Rvr Slough carry?

About 1,500 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is SH 51 over West Bruneau Rvr Slough?

The structure is 35 ft (10.7 m) long with a longest span of 34 ft (10.4 m) and a deck 29 ft wide.

Who owns SH 51 over West Bruneau Rvr Slough?

It is owned by the State Highway Agency.