US Bridges

County Road 9455 over Lost Creek

Fair

Okanogan County, Washington · 17.4 Mi.Se JCT.SH30 · Structure no. 081953000000000

Built
1958
67 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
43 ft
1 main span
Daily traffic
52
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 9455 over Lost Creek is a wood or timber stringer/multi-beam or girder carrying County Road 9455 over Lost Creek in Okanogan County, Washington. It was built in 1958, so it is 67 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 52 vehicles a day, roughly 1% of them trucks, projected to reach 70 by 2042. The structure is 43 ft (13 m) long and 16 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

Location

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CarriesCounty Road 9455
CrossesLost Creek
Location17.4 Mi.Se JCT.SH30
RouteCounty Highway 94550
CountyOkanogan County
StateWashington
Coordinates48.52701, -118.93147
Functional classRural Minor 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadUnknown
Structure length43 ft (13 m)
Longest span30 ft (9 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic52 (2022)
Projected traffic70 by 2042
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 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$1.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 9455 over Lost Creek built?

It was built in 1958, making it 67 years old in 2025.

What condition is County Road 9455 over Lost Creek 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 October 2024.

How much traffic does County Road 9455 over Lost Creek carry?

About 52 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is County Road 9455 over Lost Creek?

The structure is 43 ft (13 m) long with a longest span of 30 ft (9 m) and a deck 16 ft wide.

Who owns County Road 9455 over Lost Creek?

It is owned by the County Highway Agency.