US Bridges

US 95 over Weiser River

Fair

Washington County, Idaho · 0.2 N. Cambridge Secl · Structure no. 000000000018180

Built
1954
71 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
160 ft
4 main spans
Daily traffic
3,200
2023 count
Owner
State
State Highway Agency

About this bridge

US 95 over Weiser River is a concrete stringer/multi-beam or girder carrying US 95 over Weiser River in Washington County, Idaho. It was built in 1954, so it is 71 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 5 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 3,200 vehicles a day, roughly 12% of them trucks, projected to reach 4,800 by 2042. The structure is 160 ft (48.8 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS 95
CrossesWeiser River
Location0.2 N. Cambridge Secl
RouteU.S. Route 95
CountyWashington County
StateIdaho
Coordinates44.5685, -116.67031
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length160 ft (48.8 m)
Longest span39 ft (11.9 m)
Deck width33 ft (10 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,200 (2023)
Projected traffic4,800 by 2042
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$2.8 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 95 over Weiser River built?

It was built in 1954, making it 71 years old in 2025.

What condition is US 95 over Weiser 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 September 2023.

How much traffic does US 95 over Weiser River carry?

About 3,200 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is US 95 over Weiser River?

The structure is 160 ft (48.8 m) long with a longest span of 39 ft (11.9 m) and a deck 33 ft wide.

Who owns US 95 over Weiser River?

It is owned by the State Highway Agency.