US Bridges

SR 503 Spur over Panamaker Creek

Fair

Cowlitz County, Washington · 5.8 N JCT SR 503 · Structure no. 085907000000000

Built
1961
64 years old
Condition
Fair
inspected August 2024
Type
Culvert
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
943
2023 count
Owner
State
State Highway Agency

About this bridge

SR 503 Spur over Panamaker Creek is a concrete continuous culvert carrying SR 503 Spur over Panamaker Creek in Cowlitz County, Washington. It was built in 1961, so it is 64 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 5 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 943 vehicles a day, roughly 10% of them trucks, projected to reach 977 by 2039. The structure is 23 ft (7 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesSR 503 Spur
CrossesPanamaker Creek
Location5.8 N JCT SR 503
RouteState Highway 503
CountyCowlitz County
StateWashington
Coordinates46.05675, -122.29414
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating90.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length23 ft (7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic943 (2023)
Projected traffic977 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$306,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 503 Spur over Panamaker Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is SR 503 Spur over Panamaker 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 August 2024.

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

About 943 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SR 503 Spur over Panamaker Creek?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3 m).

Who owns SR 503 Spur over Panamaker Creek?

It is owned by the State Highway Agency.