US Bridges

Joplin Road over Phyllis Canal

Fair

Ada County, Idaho · 1.6 S. 1.0 E. Star · Structure no. 000000000026115

Built
1980
45 years old
Condition
Fair
inspected November 2024
Type
Tee Beam
Prestressed Concrete
Length
72 ft
1 main span
Daily traffic
200
2023 count
Owner
County
County Highway Agency

About this bridge

Joplin Road over Phyllis Canal is a prestressed concrete tee beam carrying Joplin Road over Phyllis Canal in Ada County, Idaho. It was built in 1980, so it is 45 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 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 200 vehicles a day, roughly 10% of them trucks, projected to reach 300 by 2039. The structure is 72 ft (21.9 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesJoplin Road
CrossesPhyllis Canal
Location1.6 S. 1.0 E. Star
RouteCounty Highway 0
CountyAda County
StateIdaho
Coordinates43.66926, -116.47194
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
Deck8 Very GoodNo problems noted.
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 protection7 GoodSome minor problems.
Last inspectionNovember 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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum 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 length72 ft (21.9 m)
Longest span71 ft (21.6 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2023)
Projected traffic300 by 2039
Trucks10%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$672,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Joplin Road over Phyllis Canal built?

It was built in 1980, making it 45 years old in 2025.

What condition is Joplin Road 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 November 2024.

How much traffic does Joplin Road over Phyllis Canal carry?

About 200 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Joplin Road over Phyllis Canal?

The structure is 72 ft (21.9 m) long with a longest span of 71 ft (21.6 m) and a deck 30 ft wide.

Who owns Joplin Road over Phyllis Canal?

It is owned by the County Highway Agency.