US Bridges

SR 502 over Drainage Slough

Good

Clark County, Washington · 3.2 E JCT I-5 · Structure no. 0018573A0000000

Built
2014
11 years old
Condition
Good
inspected July 2022
Type
Slab
Concrete
Length
28 ft
1 main span
Daily traffic
11,723
2023 count
Owner
State
State Highway Agency

About this bridge

SR 502 over Drainage Slough is a concrete slab carrying SR 502 over Drainage Slough in Clark County, Washington. It was built in 2014, so it is 11 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 11,723 vehicles a day, roughly 9% of them trucks, projected to reach 12,466 by 2039. The structure is 28 ft (8.5 m) long and 98 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR 502
CrossesDrainage Slough
Location3.2 E JCT I-5
RouteState Highway 502
CountyClark County
StateWashington
Coordinates45.78025, -122.60811
Functional classUrban Other Principal 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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.2 US tons
Inventory rating41.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length28 ft (8.5 m)
Longest span26 ft (7.9 m)
Deck width98 ft (30 m)
Roadway width80 ft (24.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,723 (2023)
Projected traffic12,466 by 2039
Trucks9%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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$1.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 502 over Drainage Slough built?

It was built in 2014, making it 11 years old in 2025.

What condition is SR 502 over Drainage Slough 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 July 2022.

How much traffic does SR 502 over Drainage Slough carry?

About 11,723 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is SR 502 over Drainage Slough?

The structure is 28 ft (8.5 m) long with a longest span of 26 ft (7.9 m) and a deck 98 ft wide.

Who owns SR 502 over Drainage Slough?

It is owned by the State Highway Agency.