US Bridges

Baseline Road over I 15 Nb-Sb;baseline Gs

Fair

Bingham County, Idaho · 14.2 N. Blackfoot · Structure no. 000000000023170

Built
1962
63 years old
Condition
Fair
inspected May 2021
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
254 ft
3 main spans
Daily traffic
150
2023 count
Owner
State
State Highway Agency

About this bridge

Baseline Road over I 15 Nb-Sb;baseline Gs is a prestressed concrete stringer/multi-beam or girder carrying Baseline Road over I 15 Nb-Sb;baseline Gs in Bingham County, Idaho. It was built in 1962, so it is 63 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 254 ft (77.4 m) long and 29 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesBaseline Road
CrossesI 15 Nb-Sb;baseline Gs
Location14.2 N. Blackfoot
RouteCounty Highway 0
CountyBingham County
StateIdaho
Coordinates43.36722, -112.20489
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2021
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 alignment6: Equal to present minimum criteria
Operating rating77.1 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20
Structure length254 ft (77.4 m)
Longest span56 ft (17.1 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 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 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 million (2017 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Baseline Road over I 15 Nb-Sb;baseline Gs built?

It was built in 1962, making it 63 years old in 2025.

What condition is Baseline Road over I 15 Nb-Sb;baseline 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 2021.

How much traffic does Baseline Road over I 15 Nb-Sb;baseline Gs carry?

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

How long is Baseline Road over I 15 Nb-Sb;baseline Gs?

The structure is 254 ft (77.4 m) long with a longest span of 56 ft (17.1 m) and a deck 29 ft wide.

Who owns Baseline Road over I 15 Nb-Sb;baseline Gs?

It is owned by the State Highway Agency.