US Bridges

SR 24 over Columbia River

Poor

Benton County, Washington · 4.9 E JCT SR 240 · Structure no. 0007619A0000000

Built
1965
60 years old
Condition
Poor
inspected March 2024
Type
Truss - Thru
Steel
Length
1,982 ft
3 main spans
Daily traffic
5,506
2023 count
Owner
State
State Highway Agency

About this bridge

SR 24 over Columbia River is a steel truss - thru carrying SR 24 over Columbia River in Benton County, Washington. It was built in 1965, so it is 60 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 4 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 5,506 vehicles a day, roughly 20% of them trucks, projected to reach 6,333 by 2039. The structure is 1,982 ft (604.1 m) long and 34 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 24
CrossesColumbia River
Location4.9 E JCT SR 240
RouteState Highway 24
CountyBenton County
StateWashington
Coordinates46.63994, -119.73111
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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating39 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans3 (+14 approach)
Design loadHS 20
Structure length1,982 ft (604.1 m)
Longest span264 ft (80.5 m)
Deck width34 ft (10.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic5,506 (2023)
Projected traffic6,333 by 2039
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$32 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SR 24 over Columbia River built?

It was built in 1965, making it 60 years old in 2025.

What condition is SR 24 over Columbia River 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 March 2024.

How much traffic does SR 24 over Columbia River carry?

About 5,506 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is SR 24 over Columbia River?

The structure is 1,982 ft (604.1 m) long with a longest span of 264 ft (80.5 m) and a deck 34 ft wide.

Who owns SR 24 over Columbia River?

It is owned by the State Highway Agency.