US Bridges

N. Park Drive over Phyllis Canal

Fair

Canyon County, Idaho · In Nampa;w.Park Drive · Structure no. 000000000027720

Built
1977
48 years old
Condition
Fair
inspected February 2023
Type
Tee Beam
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
320
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

N. Park Drive over Phyllis Canal is a prestressed concrete tee beam carrying N. Park Drive over Phyllis Canal in Canyon County, Idaho. It was built in 1977, so it is 48 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 320 vehicles a day, roughly 10% of them trucks, projected to reach 480 by 2039. The structure is 24 ft (7.3 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesN. Park Drive
CrossesPhyllis Canal
LocationIn Nampa;w.Park Drive
RouteCity Street 0
CountyCanyon County
StateIdaho
Coordinates43.578, -116.58736
Functional classUrban 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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 48 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 alignment7: Better than present minimum criteria
Operating rating29.8 US tons
Inventory rating20.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length24 ft (7.3 m)
Longest span23 ft (7 m)
Deck width38 ft (11.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic320 (2023)
Projected traffic480 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$632,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was N. Park Drive over Phyllis Canal built?

It was built in 1977, making it 48 years old in 2025.

What condition is N. Park Drive 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 N. Park Drive over Phyllis Canal carry?

About 320 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is N. Park Drive over Phyllis Canal?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 38 ft wide.

Who owns N. Park Drive over Phyllis Canal?

It is owned by the City or Municipal Highway Agency.