US Bridges

SR 285 over Columbia R Gn RY

Fair

Douglas County, Washington · 0.2 N JCT SR 28 · Structure no. 0003477A0000000

Built
1950
75 years old
Condition
Fair
inspected July 2024
Type
Arch - Thru
Steel
Length
1,208 ft
3 main spans
Daily traffic
26,350
2023 count
Owner
State
State Highway Agency

About this bridge

SR 285 over Columbia R Gn RY is a steel arch - thru carrying SR 285 over Columbia R Gn RY in Douglas County, Washington. It was built in 1950, so it is 75 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 6 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 26,350 vehicles a day, roughly 3% of them trucks, projected to reach 32,428 by 2039. The structure is 1,208 ft (368.2 m) long and 65 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesSR 285
CrossesColumbia R Gn RY
Location0.2 N JCT SR 28
RouteState Highway 285
CountyDouglas County
StateWashington
Coordinates47.40992, -120.29322
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating27.4 US tons

Structure

Structure typeArch - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans3 (+6 approach)
Design loadHS 20
Structure length1,208 ft (368.2 m)
Longest span480 ft (146.3 m)
Deck width65 ft (19.7 m)
Roadway width61 ft (18.5 m)
Vertical clearance over deck17 ft (5.1 m)

Traffic and service

Average daily traffic26,350 (2023)
Projected traffic32,428 by 2039
Trucks3%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway, waterway and railroad
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$37.9 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SR 285 over Columbia R Gn RY built?

It was built in 1950, making it 75 years old in 2025.

What condition is SR 285 over Columbia R Gn RY 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 July 2024.

How much traffic does SR 285 over Columbia R Gn RY carry?

About 26,350 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is SR 285 over Columbia R Gn RY?

The structure is 1,208 ft (368.2 m) long with a longest span of 480 ft (146.3 m) and a deck 65 ft wide.

Who owns SR 285 over Columbia R Gn RY?

It is owned by the State Highway Agency.