US Bridges

N 45th E over North Fork Willow CR

FairPosted for load

Bonneville County, Idaho · 1.6 S. 1.0 E. Ucon · Structure no. 000000000031325

Built
1958
67 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
41 ft
1 main span
Daily traffic
2,100
2023 count
Owner
County
County Highway Agency

About this bridge

N 45th E over North Fork Willow CR is a steel stringer/multi-beam or girder carrying N 45th E over North Fork Willow CR in Bonneville County, Idaho. It was built in 1958, so it is 67 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. Its operating status is: posted for load restriction.

It carries about 2,100 vehicles a day, projected to reach 3,150 by 2042. The structure is 41 ft (12.5 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesN 45th E
CrossesNorth Fork Willow CR
Location1.6 S. 1.0 E. Ucon
RouteCounty Highway 0
CountyBonneville County
StateIdaho
Coordinates43.56922, -111.94381
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating16 US tons
Inventory rating9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length41 ft (12.5 m)
Longest span39 ft (11.9 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,100 (2023)
Projected traffic3,150 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$675,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was N 45th E over North Fork Willow CR built?

It was built in 1958, making it 67 years old in 2025.

What condition is N 45th E over North Fork Willow CR 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 November 2023.

How much traffic does N 45th E over North Fork Willow CR carry?

About 2,100 vehicles per day (2023 count).

How long is N 45th E over North Fork Willow CR?

The structure is 41 ft (12.5 m) long with a longest span of 39 ft (11.9 m) and a deck 27 ft wide.

Who owns N 45th E over North Fork Willow CR?

It is owned by the County Highway Agency.