US Bridges

Old Fort Boise Rd. over D Line Canal

Fair

Canyon County, Idaho · 2.4 N. 0.3 E. Parma · Structure no. 000000000027315

Built
1984
41 years old
Condition
Fair
inspected February 2023
Type
Tee Beam
Prestressed Concrete
Length
32 ft
1 main span
Daily traffic
90
2023 count
Owner
Local
Other Local Agency

About this bridge

Old Fort Boise Rd. over D Line Canal is a prestressed concrete tee beam carrying Old Fort Boise Rd. over D Line Canal in Canyon County, Idaho. It was built in 1984, so it is 41 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 90 vehicles a day, roughly 10% of them trucks, projected to reach 135 by 2039. The structure is 32 ft (9.8 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesOld Fort Boise Rd.
CrossesD Line Canal
Location2.4 N. 0.3 E. Parma
RouteCounty Highway 0
CountyCanyon County
StateIdaho
Coordinates43.82186, -116.94203
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating33 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90 (2023)
Projected traffic135 by 2039
Trucks10%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Fort Boise Rd. over D Line Canal built?

It was built in 1984, making it 41 years old in 2025.

What condition is Old Fort Boise Rd. over D 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 February 2023.

How much traffic does Old Fort Boise Rd. over D Line Canal carry?

About 90 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Old Fort Boise Rd. over D Line Canal?

The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns Old Fort Boise Rd. over D Line Canal?

It is owned by the Other Local Agency.