US Bridges

SR 203 over Loutsis Creek

Good

King County, Washington · 13.6 N JCT SR 202 · Structure no. 0019545A0000000

Built
2020
5 years old
Condition
Good
inspected November 2024
Type
Arch - Deck
Other
Length
50 ft
1 main span
Daily traffic
13,456
2023 count
Owner
State
State Highway Agency

About this bridge

SR 203 over Loutsis Creek is a other arch - deck carrying SR 203 over Loutsis Creek in King County, Washington. It was built in 2020, so it is 5 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 13,456 vehicles a day, roughly 8% of them trucks, projected to reach 15,012 by 2039. The structure is 50 ft (15.2 m) long and 49 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSR 203
CrossesLoutsis Creek
Location13.6 N JCT SR 202
RouteState Highway 203
Coordinates47.7224, -121.98599
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating57.9 US tons
Inventory rating44.6 US tons

Structure

Structure typeArch - Deck
MaterialOther
DeckNot applicable
Main spans1
Design loadHL 93
Structure length50 ft (15.2 m)
Longest span50 ft (15.2 m)
Deck width49 ft (14.9 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,456 (2023)
Projected traffic15,012 by 2039
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$879,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 203 over Loutsis Creek built?

It was built in 2020, making it 5 years old in 2025.

What condition is SR 203 over Loutsis Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.

How much traffic does SR 203 over Loutsis Creek carry?

About 13,456 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is SR 203 over Loutsis Creek?

The structure is 50 ft (15.2 m) long with a longest span of 50 ft (15.2 m) and a deck 49 ft wide.

Who owns SR 203 over Loutsis Creek?

It is owned by the State Highway Agency.