US Bridges

Stibal Road over I 15 Nb-Sb;stibal Rd.Gs

Fair

Jefferson County, Idaho · 2.4 S. Roberts · Structure no. 000000000032620

Built
1968
57 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
233 ft
5 main spans
Daily traffic
300
2023 count
Owner
State
State Highway Agency

About this bridge

Stibal Road over I 15 Nb-Sb;stibal Rd.Gs is a prestressed concrete stringer/multi-beam or girder carrying Stibal Road over I 15 Nb-Sb;stibal Rd.Gs in Jefferson County, Idaho. It was built in 1968, so it is 57 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 300 vehicles a day, roughly 7% of them trucks, projected to reach 450 by 2042. The structure is 233 ft (71 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesStibal Road
CrossesI 15 Nb-Sb;stibal Rd.Gs
Location2.4 S. Roberts
RouteCounty Highway 0
CountyJefferson County
StateIdaho
Coordinates43.68422, -112.11903
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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 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 rating70 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length233 ft (71 m)
Longest span52 ft (15.8 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2023)
Projected traffic450 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Stibal Road over I 15 Nb-Sb;stibal Rd.Gs built?

It was built in 1968, making it 57 years old in 2025.

What condition is Stibal Road over I 15 Nb-Sb;stibal 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 April 2023.

How much traffic does Stibal Road over I 15 Nb-Sb;stibal Rd.Gs carry?

About 300 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Stibal Road over I 15 Nb-Sb;stibal Rd.Gs?

The structure is 233 ft (71 m) long with a longest span of 52 ft (15.8 m) and a deck 29 ft wide.

Who owns Stibal Road over I 15 Nb-Sb;stibal Rd.Gs?

It is owned by the State Highway Agency.