US Bridges

County Line Road over I 15 Nb-Sb;co.Line Rd.Gs

Fair

Bingham County, Idaho · 19.1 N. Blackfoot · Structure no. 000000000023180

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
160
2023 count
Owner
State
State Highway Agency

About this bridge

County Line Road over I 15 Nb-Sb;co.Line Rd.Gs is a prestressed concrete stringer/multi-beam or girder carrying County Line Road over I 15 Nb-Sb;co.Line Rd.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 160 vehicles a day, roughly 14% of them trucks, projected to reach 240 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
CarriesCounty Line Road
CrossesI 15 Nb-Sb;co.Line Rd.Gs
Location19.1 N. Blackfoot
RouteCounty Highway 0
CountyBingham County
StateIdaho
Coordinates43.42272, -112.14267
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 rating68 US tons
Inventory rating40 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 traffic160 (2023)
Projected traffic240 by 2042
Trucks14%
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 (2021 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was County Line Road over I 15 Nb-Sb;co.Line Rd.Gs built?

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

What condition is County Line Road over I 15 Nb-Sb;co.Line 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 2021.

How much traffic does County Line Road over I 15 Nb-Sb;co.Line Rd.Gs carry?

About 160 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is County Line Road over I 15 Nb-Sb;co.Line Rd.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 County Line Road over I 15 Nb-Sb;co.Line Rd.Gs?

It is owned by the State Highway Agency.