US Bridges

Hilltop Road over I 90 Eb-Wb;hilltop Rd.Gs

Fair

Shoshone County, Idaho · 8.3 W. Kellogg · Structure no. 000000000030870

Built
1967
58 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
233 ft
4 main spans
Daily traffic
260
2023 count
Owner
State
State Highway Agency

About this bridge

Hilltop Road over I 90 Eb-Wb;hilltop Rd.Gs is a prestressed concrete stringer/multi-beam or girder carrying Hilltop Road over I 90 Eb-Wb;hilltop Rd.Gs in Shoshone County, Idaho. It was built in 1967, so it is 58 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 260 vehicles a day, roughly 18% of them trucks, projected to reach 390 by 2042. The structure is 233 ft (71 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesHilltop Road
CrossesI 90 Eb-Wb;hilltop Rd.Gs
Location8.3 W. Kellogg
RouteCounty Highway 0
CountyShoshone County
StateIdaho
Coordinates47.55039, -116.29483
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: 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
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length233 ft (71 m)
Longest span58 ft (17.7 m)
Deck width31 ft (9.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic260 (2023)
Projected traffic390 by 2042
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 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$2.9 million (2017 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Hilltop Road over I 90 Eb-Wb;hilltop Rd.Gs built?

It was built in 1967, making it 58 years old in 2025.

What condition is Hilltop Road over I 90 Eb-Wb;hilltop Rd.Gs 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 May 2023.

How much traffic does Hilltop Road over I 90 Eb-Wb;hilltop Rd.Gs carry?

About 260 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is Hilltop Road over I 90 Eb-Wb;hilltop Rd.Gs?

The structure is 233 ft (71 m) long with a longest span of 58 ft (17.7 m) and a deck 31 ft wide.

Who owns Hilltop Road over I 90 Eb-Wb;hilltop Rd.Gs?

It is owned by the State Highway Agency.