US Bridges

SR 28 over Rock Island CR

Fair

Douglas County, Washington · 14.4 E JCT US 2 · Structure no. 0005016A0000000

Built
1955
70 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete Continuous
Length
81 ft
4 main spans
Daily traffic
9,816
2023 count
Owner
State
State Highway Agency

About this bridge

SR 28 over Rock Island CR is a concrete continuous slab carrying SR 28 over Rock Island CR in Douglas County, Washington. It was built in 1955, so it is 70 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 9,816 vehicles a day, roughly 16% of them trucks, projected to reach 12,039 by 2039. The structure is 81 ft (24.7 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSR 28
CrossesRock Island CR
Location14.4 E JCT US 2
RouteState Highway 28
CountyDouglas County
StateWashington
Coordinates47.3547, -120.10444
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46 US tons
Inventory rating28 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length81 ft (24.7 m)
Longest span21 ft (6.3 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,816 (2023)
Projected traffic12,039 by 2039
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 28 over Rock Island CR built?

It was built in 1955, making it 70 years old in 2025.

What condition is SR 28 over Rock Island CR 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 September 2023.

How much traffic does SR 28 over Rock Island CR carry?

About 9,816 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is SR 28 over Rock Island CR?

The structure is 81 ft (24.7 m) long with a longest span of 21 ft (6.3 m) and a deck 35 ft wide.

Who owns SR 28 over Rock Island CR?

It is owned by the State Highway Agency.