US Bridges

SR 503 Spur over Speelyai Creek

Good

Cowlitz County, Washington · 1.2 N JCT SR 503 · Structure no. 082192000000000

Built
1953
72 years old
Condition
Good
inspected February 2023
Type
Tee Beam
Concrete Continuous
Length
90 ft
3 main spans
Daily traffic
1,494
2023 count
Owner
State
State Highway Agency

About this bridge

SR 503 Spur over Speelyai Creek is a concrete continuous tee beam carrying SR 503 Spur over Speelyai Creek in Cowlitz County, Washington. It was built in 1953, so it is 72 years old, older 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 1,494 vehicles a day, roughly 10% of them trucks, projected to reach 1,584 by 2039. The structure is 90 ft (27.4 m) long and 30 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesSR 503 Spur
CrossesSpeelyai Creek
Location1.2 N JCT SR 503
RouteState Highway 503
Coordinates46.00733, -122.34597
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 rating60 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length90 ft (27.4 m)
Longest span60 ft (18.3 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,494 (2023)
Projected traffic1,584 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$1.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 503 Spur over Speelyai Creek built?

It was built in 1953, making it 72 years old in 2025.

What condition is SR 503 Spur over Speelyai 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 February 2023.

How much traffic does SR 503 Spur over Speelyai Creek carry?

About 1,494 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SR 503 Spur over Speelyai Creek?

The structure is 90 ft (27.4 m) long with a longest span of 60 ft (18.3 m) and a deck 30 ft wide.

Who owns SR 503 Spur over Speelyai Creek?

It is owned by the State Highway Agency.