US Bridges

SH 8 over W.Fk.Potlatch River

Fair

Latah County, Idaho · 0.1 W. Bovill · Structure no. 000000000010250

Built
1958
67 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Concrete
Length
52 ft
1 main span
Daily traffic
1,100
2023 count
Owner
State
State Highway Agency

About this bridge

SH 8 over W.Fk.Potlatch River is a concrete tee beam carrying SH 8 over W.Fk.Potlatch River in Latah County, Idaho. It was built in 1958, so it is 67 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 1,100 vehicles a day, roughly 28% of them trucks, projected to reach 1,650 by 2042. The structure is 52 ft (15.8 m) long and 33 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSH 8
CrossesW.Fk.Potlatch River
Location0.1 W. Bovill
RouteState Highway 8
CountyLatah County
StateIdaho
Coordinates46.85717, -116.39994
Functional classRural Minor Arterial

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 protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating30 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length52 ft (15.8 m)
Longest span50 ft (15.2 m)
Deck width33 ft (10 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2023)
Projected traffic1,650 by 2042
Trucks28%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$869,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 8 over W.Fk.Potlatch River built?

It was built in 1958, making it 67 years old in 2025.

What condition is SH 8 over W.Fk.Potlatch 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 July 2024.

How much traffic does SH 8 over W.Fk.Potlatch River carry?

About 1,100 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is SH 8 over W.Fk.Potlatch River?

The structure is 52 ft (15.8 m) long with a longest span of 50 ft (15.2 m) and a deck 33 ft wide.

Who owns SH 8 over W.Fk.Potlatch River?

It is owned by the State Highway Agency.