US Bridges

NE Index Ck RD over Skykomish River-S Fork

PoorPosted for load

King County, Washington · 0.1 MI S of SR-2 · Structure no. 079794000000000

Built
1930
95 years old, rebuilt 1952
Condition
Poor
inspected August 2024
Type
Suspension
Wood or Timber
Length
340 ft
1 main span
Daily traffic
80
2022 count
Owner
County
County Highway Agency

About this bridge

NE Index Ck RD over Skykomish River-S Fork is a wood or timber suspension carrying NE Index Ck RD over Skykomish River-S Fork in King County, Washington. It was built in 1930 and reconstructed in 1952, so it is 95 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. Its operating status is: posted for load restriction.

It carries about 80 vehicles a day, projected to reach 160 by 2042. The structure is 340 ft (103.6 m) long and 10 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesNE Index Ck RD
CrossesSkykomish River-S Fork
Location0.1 MI S of SR-2
RouteCounty Highway 89670
Coordinates47.76531, -121.4805
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating10 US tons
Inventory rating6 US tons

Structure

Structure typeSuspension
MaterialWood or Timber
DeckWood or timber
Main spans1 (+4 approach)
Design loadH 10
Structure length340 ft (103.6 m)
Longest span272 ft (82.9 m)
Deck width10 ft (3.2 m)
Roadway width8 ft (2.5 m)
Vertical clearance over deck22 ft (6.7 m)

Traffic and service

Average daily traffic80 (2022)
Projected traffic160 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 statusListed on the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$8.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was NE Index Ck RD over Skykomish River-S Fork built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1952.

What condition is NE Index Ck RD over Skykomish River-S Fork 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 August 2024.

How much traffic does NE Index Ck RD over Skykomish River-S Fork carry?

About 80 vehicles per day (2022 count).

How long is NE Index Ck RD over Skykomish River-S Fork?

The structure is 340 ft (103.6 m) long with a longest span of 272 ft (82.9 m) and a deck 10 ft wide.

Who owns NE Index Ck RD over Skykomish River-S Fork?

It is owned by the County Highway Agency.