US Bridges

Smith Avenue over Wilson Drain

Fair

Canyon County, Idaho · 0.3 N. 3.1 W. Nampa · Structure no. 000000000027035

Built
1970
55 years old
Condition
Fair
inspected March 2024
Type
Tee Beam
Prestressed Concrete
Length
61 ft
1 main span
Daily traffic
620
2023 count
Owner
Local
Other Local Agency

About this bridge

Smith Avenue over Wilson Drain is a prestressed concrete tee beam carrying Smith Avenue over Wilson Drain in Canyon County, Idaho. It was built in 1970, so it is 55 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 620 vehicles a day, projected to reach 930 by 2042. The structure is 61 ft (18.6 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSmith Avenue
CrossesWilson Drain
Location0.3 N. 3.1 W. Nampa
RouteCounty Highway 0
CountyCanyon County
StateIdaho
Coordinates43.58314, -116.62324
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length61 ft (18.6 m)
Longest span58 ft (17.7 m)
Deck width28 ft (8.6 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic620 (2023)
Projected traffic930 by 2042
Trucks0%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$639,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Smith Avenue over Wilson Drain built?

It was built in 1970, making it 55 years old in 2025.

What condition is Smith Avenue over Wilson Drain 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 2024.

How much traffic does Smith Avenue over Wilson Drain carry?

About 620 vehicles per day (2023 count).

How long is Smith Avenue over Wilson Drain?

The structure is 61 ft (18.6 m) long with a longest span of 58 ft (17.7 m) and a deck 28 ft wide.

Who owns Smith Avenue over Wilson Drain?

It is owned by the Other Local Agency.