US Bridges

County Road 1600 over Beaver Creek

Poor

Okanogan County, Washington · 2.8 MI.N.JCT.SR20 · Structure no. 079893000000000

Built
1957
68 years old
Condition
Poor
inspected September 2024
Type
Channel Beam
Concrete
Length
24 ft
1 main span
Daily traffic
43
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 1600 over Beaver Creek is a concrete channel beam carrying County Road 1600 over Beaver Creek in Okanogan County, Washington. It was built in 1957, so it is 68 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 43 vehicles a day, roughly 11% of them trucks, projected to reach 80 by 2043. The structure is 24 ft (7.3 m) long and 16 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesCounty Road 1600
CrossesBeaver Creek
Location2.8 MI.N.JCT.SR20
RouteCounty Highway 16000
Coordinates48.39236, -120.05086
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating35.7 US tons
Inventory rating27.4 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span23 ft (7 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic43 (2023)
Projected traffic80 by 2043
Trucks11%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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$840,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 1600 over Beaver Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is County Road 1600 over Beaver Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does County Road 1600 over Beaver Creek carry?

About 43 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is County Road 1600 over Beaver Creek?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 16 ft wide.

Who owns County Road 1600 over Beaver Creek?

It is owned by the County Highway Agency.