US Bridges

SR 203 over Griffin CR

Fair

King County, Washington · 3.8 N JCT SR 202 · Structure no. 0002999J0000000

Built
1945
80 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
46 ft
3 main spans
Daily traffic
7,813
2023 count
Owner
State
State Highway Agency

About this bridge

SR 203 over Griffin CR is a wood or timber stringer/multi-beam or girder carrying SR 203 over Griffin CR 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 7,813 vehicles a day, roughly 10% of them trucks, projected to reach 10,989 by 2039. The structure is 46 ft (14 m) long and 39 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesSR 203
CrossesGriffin CR
Location3.8 N JCT SR 202
RouteState Highway 203
CountyKing County
StateWashington
Coordinates47.61713, -121.9101
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length46 ft (14 m)
Longest span14 ft (4.3 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,813 (2023)
Projected traffic10,989 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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$743,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 203 over Griffin CR built?

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

What condition is SR 203 over Griffin CR 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 Griffin CR carry?

About 7,813 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SR 203 over Griffin CR?

The structure is 46 ft (14 m) long with a longest span of 14 ft (4.3 m) and a deck 39 ft wide.

Who owns SR 203 over Griffin CR?

It is owned by the State Highway Agency.