US Bridges

SR 203 over Harris Creek

Fair

King County, Washington · 8.2 N JCT SR 202 · Structure no. 000000BL0000000

Built
1945
80 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
58 ft
3 main spans
Daily traffic
9,800
2023 count
Owner
State
State Highway Agency

About this bridge

SR 203 over Harris Creek is a wood or timber stringer/multi-beam or girder carrying SR 203 over Harris Creek in King County, Washington. It was built in 1945, so it is 80 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 9,800 vehicles a day, roughly 8% of them trucks, projected to reach 13,782 by 2039. The structure is 58 ft (17.7 m) long and 30 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

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CarriesSR 203
CrossesHarris Creek
Location8.2 N JCT SR 202
RouteState Highway 203
CountyKing County
StateWashington
Coordinates47.67806, -121.90733
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadUnknown
Structure length58 ft (17.7 m)
Longest span20 ft (6.1 m)
Deck width30 ft (9.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,800 (2023)
Projected traffic13,782 by 2039
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemNo

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$826,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 203 over Harris Creek built?

It was built in 1945, making it 80 years old in 2025.

What condition is SR 203 over Harris 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 July 2023.

How much traffic does SR 203 over Harris Creek carry?

About 9,800 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is SR 203 over Harris Creek?

The structure is 58 ft (17.7 m) long with a longest span of 20 ft (6.1 m) and a deck 30 ft wide.

Who owns SR 203 over Harris Creek?

It is owned by the State Highway Agency.