US Bridges

Stc 8317;DUFF Lane over Willow Creek

Poor

Canyon County, Idaho · 2.1 N. 1.5 E. Middleton · Structure no. 000000000026885

Built
1983
42 years old
Condition
Poor
inspected September 2024
Type
Tee Beam
Prestressed Concrete
Length
28 ft
1 main span
Daily traffic
750
2023 count
Owner
Local
Other Local Agency

About this bridge

Stc 8317;DUFF Lane over Willow Creek is a prestressed concrete tee beam carrying Stc 8317;DUFF Lane over Willow Creek in Canyon County, Idaho. It was built in 1983, so it is 42 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 750 vehicles a day, roughly 3% of them trucks, projected to reach 1,125 by 2042. The structure is 28 ft (8.5 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesStc 8317;DUFF Lane
CrossesWillow Creek
Location2.1 N. 1.5 E. Middleton
RouteCounty Highway 8317
CountyCanyon County
StateIdaho
Coordinates43.74175, -116.59267
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.6 US tons
Inventory rating34.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span27 ft (8.2 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic750 (2023)
Projected traffic1,125 by 2042
Trucks3%
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

OwnerOther Local Agency
Maintained byOther Local 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 Stc 8317;DUFF Lane over Willow Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is Stc 8317;DUFF Lane over Willow Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does Stc 8317;DUFF Lane over Willow Creek carry?

About 750 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Stc 8317;DUFF Lane over Willow Creek?

The structure is 28 ft (8.5 m) long with a longest span of 27 ft (8.2 m) and a deck 32 ft wide.

Who owns Stc 8317;DUFF Lane over Willow Creek?

It is owned by the Other Local Agency.