US Bridges

Smith Avenue over Phyllis Canal

Fair

Canyon County, Idaho · 0.3 N. 2.9 W. Nampa · Structure no. 000000000027040

Built
1971
54 years old, rebuilt 2008
Condition
Fair
inspected February 2023
Type
Tee Beam
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
620
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Smith Avenue over Phyllis Canal is a prestressed concrete tee beam carrying Smith Avenue over Phyllis Canal in Canyon County, Idaho. It was built in 1971 and reconstructed in 2008, 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 620 vehicles a day, projected to reach 930 by 2042. The structure is 31 ft (9.4 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSmith Avenue
CrossesPhyllis Canal
Location0.3 N. 2.9 W. Nampa
RouteCity Street 0
CountyCanyon County
StateIdaho
Coordinates43.58317, -116.61939
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length31 ft (9.4 m)
Longest span27 ft (8.2 m)
Deck width47 ft (14.2 m)
Roadway width32 ft (9.8 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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway 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 Smith Avenue over Phyllis Canal built?

It was built in 1971, making it 54 years old in 2025. It was reconstructed in 2008.

What condition is Smith Avenue over Phyllis 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 Smith Avenue over Phyllis Canal carry?

About 620 vehicles per day (2023 count).

How long is Smith Avenue over Phyllis Canal?

The structure is 31 ft (9.4 m) long with a longest span of 27 ft (8.2 m) and a deck 47 ft wide.

Who owns Smith Avenue over Phyllis Canal?

It is owned by the City or Municipal Highway Agency.