US Bridges

Stc 6748(N 3950 E) over Lewisville Canal

FairPosted for load

Jefferson County, Idaho · 1.0 N. Rigby · Structure no. 000000000020905

Built
1950
75 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Prestressed Concrete
Length
34 ft
1 main span
Daily traffic
2,000
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 6748(N 3950 E) over Lewisville Canal is a prestressed concrete tee beam carrying Stc 6748(N 3950 E) over Lewisville Canal in Jefferson County, Idaho. It was built in 1950, so it is 75 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 2,000 vehicles a day, roughly 14% of them trucks, projected to reach 3,000 by 2042. The structure is 34 ft (10.4 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesStc 6748(N 3950 E)
CrossesLewisville Canal
Location1.0 N. Rigby
RouteCounty Highway 6748
CountyJefferson County
StateIdaho
Coordinates43.68919, -111.91389
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating30 US tons
Inventory rating18 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length34 ft (10.4 m)
Longest span32 ft (9.8 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2023)
Projected traffic3,000 by 2042
Trucks14%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$603,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 6748(N 3950 E) over Lewisville Canal built?

It was built in 1950, making it 75 years old in 2025.

What condition is Stc 6748(N 3950 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 March 2023.

How much traffic does Stc 6748(N 3950 E) over Lewisville Canal carry?

About 2,000 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is Stc 6748(N 3950 E) over Lewisville Canal?

The structure is 34 ft (10.4 m) long with a longest span of 32 ft (9.8 m) and a deck 30 ft wide.

Who owns Stc 6748(N 3950 E) over Lewisville Canal?

It is owned by the County Highway Agency.