US Bridges

Graham Road over Lewisville Canal

Fair

Jefferson County, Idaho · 1.0 N. 0.6 E. Rigby · Structure no. 000000000032370

Built
1975
50 years old
Condition
Fair
inspected March 2024
Type
Frame
Concrete
Length
20 ft
1 main span
Daily traffic
200
2023 count
Owner
County
County Highway Agency

About this bridge

Graham Road over Lewisville Canal is a concrete frame carrying Graham Road over Lewisville Canal in Jefferson County, Idaho. It was built in 1975, so it is 50 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 200 vehicles a day, roughly 10% of them trucks, projected to reach 300 by 2039. The structure is 20 ft (6.2 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesGraham Road
CrossesLewisville Canal
Location1.0 N. 0.6 E. Rigby
RouteCounty Highway 0
CountyJefferson County
StateIdaho
Coordinates43.69014, -111.90397
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 inspectionMarch 2024
Inspection intervalevery 48 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating41 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length20 ft (6.2 m)
Longest span20 ft (6.2 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2023)
Projected traffic300 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Graham Road over Lewisville Canal built?

It was built in 1975, making it 50 years old in 2025.

What condition is Graham Road 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 March 2024.

How much traffic does Graham Road over Lewisville Canal carry?

About 200 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Graham Road over Lewisville Canal?

The structure is 20 ft (6.2 m) long with a longest span of 20 ft (6.2 m) and a deck 34 ft wide.

Who owns Graham Road over Lewisville Canal?

It is owned by the County Highway Agency.