US Bridges

S6746;MENAN-LORENZ over Island Canal

Fair

Jefferson County, Idaho · 3.9 N 1.6 E Rigby · Structure no. 000000000032314

Built
2011
14 years old
Condition
Fair
inspected October 2023
Type
Frame
Concrete
Length
23 ft
1 main span
Daily traffic
2,800
2023 count
Owner
County
County Highway Agency

About this bridge

S6746;MENAN-LORENZ over Island Canal is a concrete frame carrying S6746;MENAN-LORENZ over Island Canal in Jefferson County, Idaho. It was built in 2011, so it is 14 years old, younger 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 2,800 vehicles a day, roughly 12% of them trucks, projected to reach 4,200 by 2042. The structure is 23 ft (7 m) long and 50 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesS6746;MENAN-LORENZ
CrossesIsland Canal
Location3.9 N 1.6 E Rigby
RouteCounty Highway 6746
CountyJefferson County
StateIdaho
Coordinates43.72611, -111.87739
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80 US tons
Inventory rating48 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length23 ft (7 m)
Longest span23 ft (7 m)
Deck width50 ft (15.2 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2023)
Projected traffic4,200 by 2042
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 S6746;MENAN-LORENZ over Island Canal built?

It was built in 2011, making it 14 years old in 2025.

What condition is S6746;MENAN-LORENZ over 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 October 2023.

How much traffic does S6746;MENAN-LORENZ over Island Canal carry?

About 2,800 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is S6746;MENAN-LORENZ over Island Canal?

The structure is 23 ft (7 m) long with a longest span of 23 ft (7 m) and a deck 50 ft wide.

Who owns S6746;MENAN-LORENZ over Island Canal?

It is owned by the County Highway Agency.