US Bridges

N 4100 E over Lewisville Canal

Fair

Jefferson County, Idaho · 1.0 N. 1.6 E. Rigby · Structure no. 000000000032565

Built
1969
56 years old
Condition
Fair
inspected April 2024
Type
Frame
Concrete
Length
22 ft
1 main span
Daily traffic
1,700
2023 count
Owner
County
County Highway Agency

About this bridge

N 4100 E over Lewisville Canal is a concrete frame carrying N 4100 E over Lewisville Canal in Jefferson County, Idaho. It was built in 1969, so it is 56 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 1,700 vehicles a day, roughly 8% of them trucks, projected to reach 2,550 by 2042. The structure is 22 ft (6.7 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesN 4100 E
CrossesLewisville Canal
Location1.0 N. 1.6 E. Rigby
RouteCounty Highway 0
CountyJefferson County
StateIdaho
Coordinates43.69106, -111.88406
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span22 ft (6.7 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2023)
Projected traffic2,550 by 2042
Trucks8%
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$540,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was N 4100 E over Lewisville Canal built?

It was built in 1969, making it 56 years old in 2025.

What condition is N 4100 E over Lewisville Canal 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 2024.

How much traffic does N 4100 E over Lewisville Canal carry?

About 1,700 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is N 4100 E over Lewisville Canal?

The structure is 22 ft (6.7 m) long with a longest span of 22 ft (6.7 m) and a deck 28 ft wide.

Who owns N 4100 E over Lewisville Canal?

It is owned by the County Highway Agency.