US Bridges

SR 503 over N Branch Chelatchie CR

Poor

Clark County, Washington · 13.5 N JCT SR 502 · Structure no. 000000MN0000000

Built
1953
72 years old
Condition
Poor
inspected July 2023
Type
Slab
Concrete
Length
25 ft
1 main span
Daily traffic
838
2023 count
Owner
State
State Highway Agency

About this bridge

SR 503 over N Branch Chelatchie CR is a concrete slab carrying SR 503 over N Branch Chelatchie CR 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 poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 838 vehicles a day, roughly 10% of them trucks, projected to reach 1,190 by 2039. The structure is 25 ft (7.6 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSR 503
CrossesN Branch Chelatchie CR
Location13.5 N JCT SR 502
RouteState Highway 503
CountyClark County
StateWashington
Coordinates45.91713, -122.43499
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating34.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span22 ft (6.7 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic838 (2023)
Projected traffic1,190 by 2039
Trucks10%
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$309,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 503 over N Branch Chelatchie CR built?

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

What condition is SR 503 over N Branch Chelatchie CR in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2023.

How much traffic does SR 503 over N Branch Chelatchie CR carry?

About 838 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SR 503 over N Branch Chelatchie CR?

The structure is 25 ft (7.6 m) long with a longest span of 22 ft (6.7 m) and a deck 28 ft wide.

Who owns SR 503 over N Branch Chelatchie CR?

It is owned by the State Highway Agency.