US Bridges

I 90RAMP EB Off over S.Fk.Cda R.;eb Off Ramp

PoorPosted for load

Shoshone County, Idaho · 3.5 E. Wallace · Structure no. 000000000017430

Built
1964
61 years old
Condition
Poor
inspected September 2024
Type
Tee Beam
Concrete
Length
175 ft
3 main spans
Daily traffic
20
2023 count
Owner
State
State Highway Agency

About this bridge

I 90RAMP EB Off over S.Fk.Cda R.;eb Off Ramp is a concrete tee beam carrying I 90RAMP EB Off over S.Fk.Cda R.;eb Off Ramp in Shoshone County, Idaho. It was built in 1964, so it is 61 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 20 vehicles a day, projected to reach 30 by 2042. The structure is 175 ft (53.3 m) long and 22 ft wide.

CarriesI 90RAMP EB Off
CrossesS.Fk.Cda R.;eb Off Ramp
Location3.5 E. Wallace
RouteInterstate 90
StateIdaho
Coordinates47.46861, -115.85167
Functional classRural Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
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 rating17 US tons
Inventory rating10 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length175 ft (53.3 m)
Longest span77 ft (23.5 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2023)
Projected traffic30 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2 million (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I 90RAMP EB Off over S.Fk.Cda R.;eb Off Ramp built?

It was built in 1964, making it 61 years old in 2025.

What condition is I 90RAMP EB Off over S.Fk.Cda R.;eb Off Ramp in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does I 90RAMP EB Off over S.Fk.Cda R.;eb Off Ramp carry?

About 20 vehicles per day (2023 count).

How long is I 90RAMP EB Off over S.Fk.Cda R.;eb Off Ramp?

The structure is 175 ft (53.3 m) long with a longest span of 77 ft (23.5 m) and a deck 22 ft wide.

Who owns I 90RAMP EB Off over S.Fk.Cda R.;eb Off Ramp?

It is owned by the State Highway Agency.