US Bridges

E 400 N over Rigby Canal

Fair

Jefferson County, Idaho · 2.22 NE Rigby · Structure no. 000000000036175

Built
1969
56 years old
Condition
Fair
inspected November 2024
Type
Frame
Concrete
Length
22 ft
1 main span
Daily traffic
300
2023 count
Owner
County
County Highway Agency

About this bridge

E 400 N over Rigby Canal is a concrete frame carrying E 400 N over Rigby 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 300 vehicles a day, roughly 2% of them trucks, projected to reach 450 by 2040. The structure is 22 ft (6.7 m) long and 29 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesE 400 N
CrossesRigby Canal
Location2.22 NE Rigby
RouteCounty Highway 0
StateIdaho
Coordinates43.68469, -111.87372
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 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being 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 width29 ft (8.8 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2023)
Projected traffic450 by 2040
Trucks2%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was E 400 N over Rigby Canal built?

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

What condition is E 400 N over Rigby 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 November 2024.

How much traffic does E 400 N over Rigby Canal carry?

About 300 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is E 400 N over Rigby Canal?

The structure is 22 ft (6.7 m) long with a longest span of 22 ft (6.7 m) and a deck 29 ft wide.

Who owns E 400 N over Rigby Canal?

It is owned by the County Highway Agency.