US Bridges

SR 203 over Tolt River

Fair

King County, Washington · 5.3 N JCT SR 202 · Structure no. 0010370A0000000

Built
1977
48 years old
Condition
Fair
inspected October 2024
Type
Truss - Thru
Steel
Length
268 ft
1 main span
Daily traffic
10,906
2023 count
Owner
State
State Highway Agency

About this bridge

SR 203 over Tolt River is a steel truss - thru carrying SR 203 over Tolt River in King County, Washington. It was built in 1977, so it is 48 years old, younger 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 10,906 vehicles a day, roughly 8% of them trucks, projected to reach 15,339 by 2039. The structure is 268 ft (81.7 m) long and 43 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesSR 203
CrossesTolt River
Location5.3 N JCT SR 202
RouteState Highway 203
CountyKing County
StateWashington
Coordinates47.63747, -121.91631
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating62.9 US tons
Inventory rating37 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20 + Mod
Structure length268 ft (81.7 m)
Longest span160 ft (48.8 m)
Deck width43 ft (13 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic10,906 (2023)
Projected traffic15,339 by 2039
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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$4.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 203 over Tolt River built?

It was built in 1977, making it 48 years old in 2025.

What condition is SR 203 over Tolt River 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 October 2024.

How much traffic does SR 203 over Tolt River carry?

About 10,906 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is SR 203 over Tolt River?

The structure is 268 ft (81.7 m) long with a longest span of 160 ft (48.8 m) and a deck 43 ft wide.

Who owns SR 203 over Tolt River?

It is owned by the State Highway Agency.