US Bridges

Knot Lane over High Line Canal

Fair

Canyon County, Idaho · 3.1 S. 1.8 E. Middleton · Structure no. 000000000026981

Built
1995
30 years old
Condition
Fair
inspected March 2023
Type
Frame
Concrete
Length
30 ft
1 main span
Daily traffic
70
2023 count
Owner
Local
Other Local Agency

About this bridge

Knot Lane over High Line Canal is a concrete frame carrying Knot Lane over High Line Canal in Canyon County, Idaho. It was built in 1995, so it is 30 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 70 vehicles a day, roughly 17% of them trucks, projected to reach 105 by 2042. The structure is 30 ft (9.1 m) long and 32 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesKnot Lane
CrossesHigh Line Canal
Location3.1 S. 1.8 E. Middleton
RouteCounty Highway 0
CountyCanyon County
StateIdaho
Coordinates43.66289, -116.58346
Functional classUrban 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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2023)
Projected traffic105 by 2042
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 Knot Lane over High Line Canal built?

It was built in 1995, making it 30 years old in 2025.

What condition is Knot Lane over High Line 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 Knot Lane over High Line Canal carry?

About 70 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is Knot Lane over High Line Canal?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns Knot Lane over High Line Canal?

It is owned by the Other Local Agency.