US Bridges

Stc 8317;DUFF Lane over Canyon Canal

FairPosted for load

Canyon County, Idaho · 0.3 S. 1.3 E. Middleton · Structure no. 000000000027400

Built
1956
69 years old, rebuilt 1984
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
27 ft
1 main span
Daily traffic
3,100
2023 count
Owner
Local
Other Local Agency

About this bridge

Stc 8317;DUFF Lane over Canyon Canal is a steel stringer/multi-beam or girder carrying Stc 8317;DUFF Lane over Canyon Canal in Canyon County, Idaho. It was built in 1956 and reconstructed in 1984, so it is 69 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 3,100 vehicles a day, roughly 4% of them trucks, projected to reach 4,650 by 2042. The structure is 27 ft (8.2 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesStc 8317;DUFF Lane
CrossesCanyon Canal
Location0.3 S. 1.3 E. Middleton
RouteCounty Highway 8317
CountyCanyon County
StateIdaho
Coordinates43.70406, -116.59294
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 protection7 GoodSome minor problems.
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length27 ft (8.2 m)
Longest span25 ft (7.6 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,100 (2023)
Projected traffic4,650 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$534,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 8317;DUFF Lane over Canyon Canal built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1984.

What condition is Stc 8317;DUFF Lane over Canyon 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 8317;DUFF Lane over Canyon Canal carry?

About 3,100 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Stc 8317;DUFF Lane over Canyon Canal?

The structure is 27 ft (8.2 m) long with a longest span of 25 ft (7.6 m) and a deck 36 ft wide.

Who owns Stc 8317;DUFF Lane over Canyon Canal?

It is owned by the Other Local Agency.