US Bridges

400N;FIRTH Wapello over Reservation Canal

Fair

Bingham County, Idaho · 3.5 S. Firth · Structure no. 000000000022835

Built
1974
51 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Prestressed Concrete
Length
63 ft
1 main span
Daily traffic
160
2023 count
Owner
County
County Highway Agency

About this bridge

400N;FIRTH Wapello over Reservation Canal is a prestressed concrete tee beam carrying 400N;FIRTH Wapello over Reservation Canal in Bingham County, Idaho. It was built in 1974, so it is 51 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 63 ft (19.2 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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Carries400N;FIRTH Wapello
CrossesReservation Canal
Location3.5 S. Firth
RouteCounty Highway 0
CountyBingham County
StateIdaho
Coordinates43.25363, -112.18394
Functional classRural Minor Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length63 ft (19.2 m)
Longest span61 ft (18.6 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 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
CrossesWaterway
Detour if closed3.7 mi (6 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 400N;FIRTH Wapello over Reservation Canal built?

It was built in 1974, making it 51 years old in 2025.

What condition is 400N;FIRTH Wapello over Reservation 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 2023.

How much traffic does 400N;FIRTH Wapello over Reservation Canal carry?

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

How long is 400N;FIRTH Wapello over Reservation Canal?

The structure is 63 ft (19.2 m) long with a longest span of 61 ft (18.6 m) and a deck 30 ft wide.

Who owns 400N;FIRTH Wapello over Reservation Canal?

It is owned by the County Highway Agency.