US Bridges

Chisholm Drive over Phyllis Canal

Fair

Canyon County, Idaho · 1.4 N. 0.2 E. Nampa · Structure no. 000000000027718

Built
1996
29 years old
Condition
Fair
inspected October 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
47 ft
1 main span
Daily traffic
5
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Chisholm Drive over Phyllis Canal is a prestressed concrete box beam or girders - multiple carrying Chisholm Drive over Phyllis Canal in Canyon County, Idaho. It was built in 1996, so it is 29 years old, younger 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 5 vehicles a day, projected to reach 8 by 2039. The structure is 47 ft (14.3 m) long and 44 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesChisholm Drive
CrossesPhyllis Canal
Location1.4 N. 0.2 E. Nampa
RouteCity Street 0
CountyCanyon County
StateIdaho
Coordinates43.59889, -116.54817
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating89 US tons
Inventory rating45 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length47 ft (14.3 m)
Longest span44 ft (13.4 m)
Deck width44 ft (13.5 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2023)
Projected traffic8 by 2039
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Chisholm Drive over Phyllis Canal built?

It was built in 1996, making it 29 years old in 2025.

What condition is Chisholm 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 October 2022.

How much traffic does Chisholm Drive over Phyllis Canal carry?

About 5 vehicles per day (2023 count).

How long is Chisholm Drive over Phyllis Canal?

The structure is 47 ft (14.3 m) long with a longest span of 44 ft (13.4 m) and a deck 44 ft wide.

Who owns Chisholm Drive over Phyllis Canal?

It is owned by the City or Municipal Highway Agency.