US Bridges

STP7713;FARMWAY RD over Phyllis Canal

Fair

Canyon County, Idaho · 1.9 S. 1.3 W. Caldwell · Structure no. 000000000021740

Built
1967
58 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Prestressed Concrete
Length
26 ft
1 main span
Daily traffic
6,200
2023 count
Owner
Local
Other Local Agency

About this bridge

STP7713;FARMWAY RD over Phyllis Canal is a prestressed concrete tee beam carrying STP7713;FARMWAY RD over Phyllis Canal in Canyon County, Idaho. It was built in 1967, so it is 58 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 5 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 6,200 vehicles a day, roughly 11% of them trucks, projected to reach 9,300 by 2042. The structure is 26 ft (7.9 m) long and 52 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSTP7713;FARMWAY RD
CrossesPhyllis Canal
Location1.9 S. 1.3 W. Caldwell
RouteCounty Highway 7713
CountyCanyon County
StateIdaho
Coordinates43.63722, -116.71311
Functional classUrban Other Principal Arterial

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 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 geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum 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 loadHS 20
Structure length26 ft (7.9 m)
Longest span23 ft (7 m)
Deck width52 ft (15.8 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,200 (2023)
Projected traffic9,300 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 STP7713;FARMWAY RD over Phyllis Canal built?

It was built in 1967, making it 58 years old in 2025.

What condition is STP7713;FARMWAY RD 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 March 2023.

How much traffic does STP7713;FARMWAY RD over Phyllis Canal carry?

About 6,200 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is STP7713;FARMWAY RD over Phyllis Canal?

The structure is 26 ft (7.9 m) long with a longest span of 23 ft (7 m) and a deck 52 ft wide.

Who owns STP7713;FARMWAY RD over Phyllis Canal?

It is owned by the Other Local Agency.