US Bridges

SR 503 over Chelatchie Creek

Good

Clark County, Washington · 12.7 N JCT SR 502 · Structure no. 000000MM0000000

Built
1953
72 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
31 ft
1 main span
Daily traffic
4,008
2023 count
Owner
State
State Highway Agency

About this bridge

SR 503 over Chelatchie Creek is a steel stringer/multi-beam or girder carrying SR 503 over Chelatchie Creek in Clark 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 4,008 vehicles a day, roughly 7% of them trucks, projected to reach 5,873 by 2039. The structure is 31 ft (9.4 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSR 503
CrossesChelatchie Creek
Location12.7 N JCT SR 502
RouteState Highway 503
Coordinates45.91109, -122.44679
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating72 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span28 ft (8.5 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,008 (2023)
Projected traffic5,873 by 2039
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$471,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 503 over Chelatchie Creek built?

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

What condition is SR 503 over Chelatchie 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 August 2024.

How much traffic does SR 503 over Chelatchie Creek carry?

About 4,008 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is SR 503 over Chelatchie Creek?

The structure is 31 ft (9.4 m) long with a longest span of 28 ft (8.5 m) and a deck 31 ft wide.

Who owns SR 503 over Chelatchie Creek?

It is owned by the State Highway Agency.