US Bridges

SH 45 over Snake R.(walters Ferry)

Fair

Owyhee County, Idaho · 17 S. Nampa · Structure no. 000000000014300

Built
1972
53 years old, rebuilt 2020
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
685 ft
10 main spans
Daily traffic
1,900
2023 count
Owner
State
State Highway Agency

About this bridge

SH 45 over Snake R.(walters Ferry) is a prestressed concrete stringer/multi-beam or girder carrying SH 45 over Snake R.(walters Ferry) in Owyhee County, Idaho. It was built in 1972 and reconstructed in 2020, so it is 53 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.

It carries about 1,900 vehicles a day, roughly 21% of them trucks, projected to reach 2,850 by 2042. The structure is 685 ft (208.8 m) long and 40 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesSH 45
CrossesSnake R.(walters Ferry)
Location17 S. Nampa
RouteState Highway 45
CountyOwyhee County
StateIdaho
Coordinates43.34122, -116.60292
Functional classRural Principal Arterial - Other

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 protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans10
Design loadHS 20
Structure length685 ft (208.8 m)
Longest span67 ft (20.3 m)
Deck width40 ft (12.1 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,900 (2023)
Projected traffic2,850 by 2042
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemYes

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$6.7 million (2018 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SH 45 over Snake R.(walters Ferry) built?

It was built in 1972, making it 53 years old in 2025. It was reconstructed in 2020.

What condition is SH 45 over Snake R.(walters Ferry) 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 February 2023.

How much traffic does SH 45 over Snake R.(walters Ferry) carry?

About 1,900 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is SH 45 over Snake R.(walters Ferry)?

The structure is 685 ft (208.8 m) long with a longest span of 67 ft (20.3 m) and a deck 40 ft wide.

Who owns SH 45 over Snake R.(walters Ferry)?

It is owned by the State Highway Agency.