US Bridges

CO RD 06470 over Kettle River

Fair

Ferry County, Washington · 00.18 E SR 21 · Structure no. 085717000000000

Built
1910
115 years old, rebuilt 1978
Condition
Fair
inspected June 2024
Type
Tee Beam
Prestressed Concrete
Length
288 ft
3 main spans
Daily traffic
30
2018 count
Owner
County
County Highway Agency

About this bridge

CO RD 06470 over Kettle River is a prestressed concrete tee beam carrying CO RD 06470 over Kettle River in Ferry County, Washington. It was built in 1910 and reconstructed in 1978, so it is 115 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 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 30 vehicles a day, roughly 5% of them trucks, projected to reach 65 by 2040. The structure is 288 ft (87.8 m) long and 22 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesCO RD 06470
CrossesKettle River
Location00.18 E SR 21
RouteCounty Highway 6470
Coordinates48.99102, -118.50522
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating67.1 US tons
Inventory rating43.5 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length288 ft (87.8 m)
Longest span96 ft (29.3 m)
Deck width22 ft (6.6 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2018)
Projected traffic65 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$10.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was CO RD 06470 over Kettle River built?

It was built in 1910, making it 115 years old in 2025. It was reconstructed in 1978.

What condition is CO RD 06470 over Kettle River 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 June 2024.

How much traffic does CO RD 06470 over Kettle River carry?

About 30 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is CO RD 06470 over Kettle River?

The structure is 288 ft (87.8 m) long with a longest span of 96 ft (29.3 m) and a deck 22 ft wide.

Who owns CO RD 06470 over Kettle River?

It is owned by the County Highway Agency.