US Bridges

Summit Rd. over I 15 Nb-Sb;summit Rd.Gs

Fair

Oneida County, Idaho · 11.7 N. Malad · Structure no. 000000000023425

Built
1971
54 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
304 ft
2 main spans
Daily traffic
150
2023 count
Owner
State
State Highway Agency

About this bridge

Summit Rd. over I 15 Nb-Sb;summit Rd.Gs is a steel continuous stringer/multi-beam or girder carrying Summit Rd. over I 15 Nb-Sb;summit Rd.Gs in Oneida County, Idaho. It was built in 1971, so it is 54 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 150 vehicles a day, roughly 10% of them trucks, projected to reach 225 by 2042. The structure is 304 ft (92.7 m) long and 32 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSummit Rd.
CrossesI 15 Nb-Sb;summit Rd.Gs
Location11.7 N. Malad
RouteCounty Highway 0
CountyOneida County
StateIdaho
Coordinates42.34353, -112.22733
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25 US tons
Inventory rating19 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length304 ft (92.7 m)
Longest span124 ft (37.8 m)
Deck width32 ft (9.7 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2023)
Projected traffic225 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed98.8 mi (159 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$2.7 million (2017 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Summit Rd. over I 15 Nb-Sb;summit Rd.Gs built?

It was built in 1971, making it 54 years old in 2025.

What condition is Summit Rd. over I 15 Nb-Sb;summit 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 July 2024.

How much traffic does Summit Rd. over I 15 Nb-Sb;summit Rd.Gs carry?

About 150 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Summit Rd. over I 15 Nb-Sb;summit Rd.Gs?

The structure is 304 ft (92.7 m) long with a longest span of 124 ft (37.8 m) and a deck 32 ft wide.

Who owns Summit Rd. over I 15 Nb-Sb;summit Rd.Gs?

It is owned by the State Highway Agency.