US Bridges

Parma Road over D Line Canal

Fair

Canyon County, Idaho · 2.4 N. 0.4 E. Parma · Structure no. 000000000023718

Built
1971
54 years old
Condition
Fair
inspected October 2024
Type
Tee Beam
Prestressed Concrete
Length
23 ft
1 main span
Daily traffic
90
2023 count
Owner
Local
Other Local Agency

About this bridge

Parma Road over D Line Canal is a prestressed concrete tee beam carrying Parma Road over D Line Canal in Canyon County, Idaho. It was built in 1971, so it is 54 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.

It carries about 90 vehicles a day, roughly 10% of them trucks, projected to reach 135 by 2040. The structure is 23 ft (7 m) long and 30 ft wide.

Location

Open in Google Maps
CarriesParma Road
CrossesD Line Canal
Location2.4 N. 0.4 E. Parma
RouteCounty Highway 0
CountyCanyon County
StateIdaho
Coordinates43.82076, -116.93412
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length23 ft (7 m)
Longest span21 ft (6.4 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90 (2023)
Projected traffic135 by 2040
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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$284,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Parma Road over D Line Canal built?

It was built in 1971, making it 54 years old in 2025.

What condition is Parma Road 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 October 2024.

How much traffic does Parma Road over D Line Canal carry?

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

How long is Parma Road over D Line Canal?

The structure is 23 ft (7 m) long with a longest span of 21 ft (6.4 m) and a deck 30 ft wide.

Who owns Parma Road over D Line Canal?

It is owned by the Other Local Agency.