US Bridges

Lost River RD over Gate Creek

FairPosted for load

Okanogan County, Washington · 4 Mi. N. of Goat CR RD · Structure no. 081150000000000

Built
1971
54 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
32 ft
1 main span
Daily traffic
395
2023 count
Owner
County
County Highway Agency

About this bridge

Lost River RD over Gate Creek is a prestressed concrete stringer/multi-beam or girder carrying Lost River RD over Gate Creek in Okanogan County, Washington. It was built in 1971, so it is 54 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 395 vehicles a day, roughly 5% of them trucks, projected to reach 540 by 2043. The structure is 32 ft (9.8 m) long and 28 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesLost River RD
CrossesGate Creek
Location4 Mi. N. of Goat CR RD
RouteCounty Highway 91400
Coordinates48.62444, -120.45796
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating47.2 US tons
Inventory rating27.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span31 ft (9.5 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic395 (2023)
Projected traffic540 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$395,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Lost River RD over Gate Creek built?

It was built in 1971, making it 54 years old in 2025.

What condition is Lost River RD over Gate 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 September 2024.

How much traffic does Lost River RD over Gate Creek carry?

About 395 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Lost River RD over Gate Creek?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.5 m) and a deck 28 ft wide.

Who owns Lost River RD over Gate Creek?

It is owned by the County Highway Agency.