US Bridges

County Highway over Potholes Canal

FairPosted for load

Franklin County, Washington · 0.07E Sagehill 400 · Structure no. 083032000000000

Built
1956
69 years old, rebuilt 1974
Condition
Fair
inspected December 2023
Type
Tee Beam
Prestressed Concrete
Length
51 ft
2 main spans
Daily traffic
1,178
2021 count
Owner
County
County Highway Agency

About this bridge

County Highway over Potholes Canal is a prestressed concrete tee beam carrying County Highway over Potholes Canal in Franklin County, Washington. It was built in 1956 and reconstructed in 1974, so it is 69 years old, older than the Washington average of 49.8 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. Its operating status is: posted for load restriction.

It carries about 1,178 vehicles a day, roughly 12% of them trucks, projected to reach 3,270 by 2040. The structure is 51 ft (15.5 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesCounty Highway
CrossesPotholes Canal
Location0.07E Sagehill 400
RouteCounty Highway 6080
CountyFranklin County
StateWashington
Coordinates46.5912, -119.17495
Functional classRural Major 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating8.3 US tons
Inventory rating6.4 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span26 ft (7.9 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,178 (2021)
Projected traffic3,270 by 2040
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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$2.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Highway over Potholes Canal built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1974.

What condition is County Highway over Potholes 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 December 2023.

How much traffic does County Highway over Potholes Canal carry?

About 1,178 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is County Highway over Potholes Canal?

The structure is 51 ft (15.5 m) long with a longest span of 26 ft (7.9 m) and a deck 32 ft wide.

Who owns County Highway over Potholes Canal?

It is owned by the County Highway Agency.