US Bridges

SH 78 over Snake R.;indian Cove Br.

Fair

Owyhee County, Idaho · 4.1 W. Hammett · Structure no. 000000000015300

Built
1967
58 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
562 ft
8 main spans
Daily traffic
1,600
2023 count
Owner
State
State Highway Agency

About this bridge

SH 78 over Snake R.;indian Cove Br. is a prestressed concrete stringer/multi-beam or girder carrying SH 78 over Snake R.;indian Cove Br. in Owyhee County, Idaho. It was built in 1967, so it is 58 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 1,600 vehicles a day, roughly 15% of them trucks, projected to reach 2,400 by 2042. The structure is 562 ft (171.3 m) long and 31 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesSH 78
CrossesSnake R.;indian Cove Br.
Location4.1 W. Hammett
RouteState Highway 78
CountyOwyhee County
StateIdaho
Coordinates42.94207, -115.53356
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating87 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length562 ft (171.3 m)
Longest span68 ft (20.8 m)
Deck width31 ft (9.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,600 (2023)
Projected traffic2,400 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 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 proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$660,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 78 over Snake R.;indian Cove Br. built?

It was built in 1967, making it 58 years old in 2025.

What condition is SH 78 over Snake R.;indian Cove Br. 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 SH 78 over Snake R.;indian Cove Br. carry?

About 1,600 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is SH 78 over Snake R.;indian Cove Br.?

The structure is 562 ft (171.3 m) long with a longest span of 68 ft (20.8 m) and a deck 31 ft wide.

Who owns SH 78 over Snake R.;indian Cove Br.?

It is owned by the State Highway Agency.