US Bridges

Bowman Road over I 15 Nb-Sb;bowman Rd.Gs

Fair

Bannock County, Idaho · 7.2 S. Arimo · Structure no. 000000000022060

Built
1971
54 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
274 ft
2 main spans
Daily traffic
100
2023 count
Owner
State
State Highway Agency

About this bridge

Bowman Road over I 15 Nb-Sb;bowman Rd.Gs is a steel continuous stringer/multi-beam or girder carrying Bowman Road over I 15 Nb-Sb;bowman Rd.Gs in Bannock 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 150 by 2042. The structure is 274 ft (83.5 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesBowman Road
CrossesI 15 Nb-Sb;bowman Rd.Gs
Location7.2 S. Arimo
RouteCounty Highway 0
CountyBannock County
StateIdaho
Coordinates42.47422, -112.17
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 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length274 ft (83.5 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 traffic100 (2023)
Projected traffic150 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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 Bowman Road over I 15 Nb-Sb;bowman Rd.Gs built?

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

What condition is Bowman Road over I 15 Nb-Sb;bowman 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 2023.

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

About 100 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Bowman Road over I 15 Nb-Sb;bowman Rd.Gs?

The structure is 274 ft (83.5 m) long with a longest span of 124 ft (37.8 m) and a deck 32 ft wide.

Who owns Bowman Road over I 15 Nb-Sb;bowman Rd.Gs?

It is owned by the State Highway Agency.