US Bridges

US 95 over Boise River

Fair

Canyon County, Idaho · 4.7 N. Wilder Ncl · Structure no. 000000000018065

Built
1961
64 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
425 ft
10 main spans
Daily traffic
3,900
2023 count
Owner
State
State Highway Agency

About this bridge

US 95 over Boise River is a concrete stringer/multi-beam or girder carrying US 95 over Boise River in Canyon County, Idaho. It was built in 1961, so it is 64 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 3,900 vehicles a day, roughly 21% of them trucks, projected to reach 5,850 by 2042. The structure is 425 ft (129.5 m) long and 33 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesUS 95
CrossesBoise River
Location4.7 N. Wilder Ncl
RouteU.S. Route 95
CountyCanyon County
StateIdaho
Coordinates43.74639, -116.91272
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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2023
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans10
Design loadHS 20
Structure length425 ft (129.5 m)
Longest span42 ft (12.8 m)
Deck width33 ft (10 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,900 (2023)
Projected traffic5,850 by 2042
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

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$5.4 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 95 over Boise River built?

It was built in 1961, making it 64 years old in 2025.

What condition is US 95 over Boise 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 Boise River carry?

About 3,900 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is US 95 over Boise River?

The structure is 425 ft (129.5 m) long with a longest span of 42 ft (12.8 m) and a deck 33 ft wide.

Who owns US 95 over Boise River?

It is owned by the State Highway Agency.