US Bridges

SR 169 over Np RY

Fair

King County, Washington · 10.4 N JCT SR 164 · Structure no. 0002352A0000000

Built
1939
86 years old, rebuilt 1989
Condition
Fair
inspected May 2023
Type
Tee Beam
Concrete Continuous
Length
153 ft
3 main spans
Daily traffic
15,568
2023 count
Owner
State
State Highway Agency

About this bridge

SR 169 over Np RY is a concrete continuous tee beam carrying SR 169 over Np RY in King County, Washington. It was built in 1939 and reconstructed in 1989, so it is 86 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 15,568 vehicles a day, roughly 7% of them trucks, projected to reach 20,304 by 2039. The structure is 153 ft (46.6 m) long and 43 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSR 169
CrossesNp RY
Location10.4 N JCT SR 164
RouteState Highway 169
CountyKing County
StateWashington
Coordinates47.34664, -122.01892
Functional classUrban Other Principal Arterial

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.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating19 US tons
Inventory rating14.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length153 ft (46.6 m)
Longest span62 ft (18.9 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,568 (2023)
Projected traffic20,304 by 2039
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 169 over Np RY built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1989.

What condition is SR 169 over Np RY 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 May 2023.

How much traffic does SR 169 over Np RY carry?

About 15,568 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is SR 169 over Np RY?

The structure is 153 ft (46.6 m) long with a longest span of 62 ft (18.9 m) and a deck 43 ft wide.

Who owns SR 169 over Np RY?

It is owned by the State Highway Agency.