US Bridges

Lost River RD over Methow River

Fair

Okanogan County, Washington · .Nese S25 T36 R19 · Structure no. 083318000000000

Built
1972
53 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
214 ft
3 main spans
Daily traffic
1,057
2020 count
Owner
County
County Highway Agency

About this bridge

Lost River RD over Methow River is a prestressed concrete continuous stringer/multi-beam or girder carrying Lost River RD over Methow River in Okanogan County, Washington. It was built in 1972, so it is 53 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 1,057 vehicles a day, roughly 11% of them trucks, projected to reach 1,100 by 2042. The structure is 214 ft (65.3 m) long and 37 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

CarriesLost River RD
CrossesMethow River
Location.Nese S25 T36 R19
RouteCounty Highway 91400
Coordinates48.59026, -120.40702
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating39.7 US tons
Inventory rating30.3 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length214 ft (65.3 m)
Longest span155 ft (47.2 m)
Deck width37 ft (11.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,057 (2020)
Projected traffic1,100 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed11.2 mi (18 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$8.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Lost River RD over Methow River built?

It was built in 1972, making it 53 years old in 2025.

What condition is Lost River RD over Methow 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 September 2024.

How much traffic does Lost River RD over Methow River carry?

About 1,057 vehicles per day (2020 count), of which roughly 11% are trucks.

How long is Lost River RD over Methow River?

The structure is 214 ft (65.3 m) long with a longest span of 155 ft (47.2 m) and a deck 37 ft wide.

Who owns Lost River RD over Methow River?

It is owned by the County Highway Agency.