US Bridges

STC3742;WAMSTAD RD over Riverside Canal

Fair

Canyon County, Idaho · 3.2 S. 0.2 W. Parma · Structure no. 000000000026870

Built
1969
56 years old
Condition
Fair
inspected February 2024
Type
Tee Beam
Prestressed Concrete
Length
32 ft
1 main span
Daily traffic
650
2023 count
Owner
Local
Other Local Agency

About this bridge

STC3742;WAMSTAD RD over Riverside Canal is a prestressed concrete tee beam carrying STC3742;WAMSTAD RD over Riverside Canal in Canyon County, Idaho. It was built in 1969, so it is 56 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 650 vehicles a day, roughly 41% of them trucks, projected to reach 975 by 2042. The structure is 32 ft (9.8 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSTC3742;WAMSTAD RD
CrossesRiverside Canal
Location3.2 S. 0.2 W. Parma
RouteCounty Highway 3742
CountyCanyon County
StateIdaho
Coordinates43.74125, -116.95203
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53.6 US tons
Inventory rating38.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic650 (2023)
Projected traffic975 by 2042
Trucks41%
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 STC3742;WAMSTAD RD over Riverside Canal built?

It was built in 1969, making it 56 years old in 2025.

What condition is STC3742;WAMSTAD RD over Riverside 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 2024.

How much traffic does STC3742;WAMSTAD RD over Riverside Canal carry?

About 650 vehicles per day (2023 count), of which roughly 41% are trucks.

How long is STC3742;WAMSTAD RD over Riverside Canal?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 32 ft wide.

Who owns STC3742;WAMSTAD RD over Riverside Canal?

It is owned by the Other Local Agency.