US Bridges

Stc 6748(N 3950 E) over Long Island Canal

Fair

Jefferson County, Idaho · 3.4 N. Rigby · Structure no. 000000000020915

Built
1975
50 years old
Condition
Fair
inspected March 2023
Type
Frame
Concrete
Length
22 ft
1 main span
Daily traffic
740
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 6748(N 3950 E) over Long Island Canal is a concrete frame carrying Stc 6748(N 3950 E) over Long Island 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 740 vehicles a day, roughly 16% of them trucks, projected to reach 1,110 by 2042. The structure is 22 ft (6.7 m) long and 28 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)
CrossesLong Island Canal
Location3.4 N. Rigby
RouteCounty Highway 6748
CountyJefferson County
StateIdaho
Coordinates43.72092, -111.91417
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 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 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 loadH 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 traffic740 (2023)
Projected traffic1,110 by 2042
Trucks16%
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$354,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

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

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

What condition is Stc 6748(N 3950 E) over Long Island 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 Long Island Canal carry?

About 740 vehicles per day (2023 count), of which roughly 16% are trucks.

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

It is owned by the County Highway Agency.