US Bridges

US 95RAMP SB over US 12 Wb; Lewiston Ic

Fair

Nez Perce County, Idaho · At Lewiston Ncl · Structure no. 000000000018805

Built
1977
48 years old
Condition
Fair
inspected February 2022
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
200 ft
3 main spans
Daily traffic
850
2023 count
Owner
State
State Highway Agency

About this bridge

US 95RAMP SB over US 12 Wb; Lewiston Ic is a concrete continuous box beam or girders - single or spread carrying US 95RAMP SB over US 12 Wb; Lewiston Ic in Nez Perce County, Idaho. It was built in 1977, so it is 48 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 850 vehicles a day, roughly 15% of them trucks, projected to reach 1,275 by 2042. The structure is 200 ft (61 m) long and 28 ft wide.

CarriesUS 95RAMP SB
CrossesUS 12 Wb; Lewiston Ic
LocationAt Lewiston Ncl
RouteU.S. Route 95
StateIdaho
Coordinates46.43032, -116.99412
Functional classUrban Other Principal 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.
Last inspectionFebruary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53 US tons
Inventory rating41 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length200 ft (61 m)
Longest span97 ft (29.6 m)
Deck width28 ft (8.4 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deck19 ft (5.6 m)

Traffic and service

Average daily traffic850 (2023)
Projected traffic1,275 by 2042
Trucks15%
Lanes on structure1
Traffic directionOne-way traffic
CarriesThird level (interchange)
CrossesHighway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 95RAMP SB over US 12 Wb; Lewiston Ic built?

It was built in 1977, making it 48 years old in 2025.

What condition is US 95RAMP SB over US 12 Wb; Lewiston Ic 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 2022.

How much traffic does US 95RAMP SB over US 12 Wb; Lewiston Ic carry?

About 850 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is US 95RAMP SB over US 12 Wb; Lewiston Ic?

The structure is 200 ft (61 m) long with a longest span of 97 ft (29.6 m) and a deck 28 ft wide.

Who owns US 95RAMP SB over US 12 Wb; Lewiston Ic?

It is owned by the State Highway Agency.