US Bridges

K RD SW over Wahluke Branch Canal

Good

Grant County, Washington · K SW .4 N of 22.5 · Structure no. 083949000000000

Built
1969
56 years old
Condition
Good
inspected January 2023
Type
Slab
Prestressed Concrete
Length
44 ft
1 main span
Daily traffic
229
2020 count
Owner
County
County Highway Agency

About this bridge

K RD SW over Wahluke Branch Canal is a prestressed concrete slab carrying K RD SW over Wahluke Branch Canal in Grant County, Washington. It was built in 1969, so it is 56 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 229 vehicles a day, roughly 15% of them trucks, projected to reach 325 by 2042. The structure is 44 ft (13.4 m) long and 28 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesK RD SW
CrossesWahluke Branch Canal
LocationK SW .4 N of 22.5
RouteCounty Highway 91047
Coordinates46.76412, -119.72604
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50.4 US tons
Inventory rating33.6 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadH 20
Structure length44 ft (13.4 m)
Longest span43 ft (13.1 m)
Deck width28 ft (8.6 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic229 (2020)
Projected traffic325 by 2042
Trucks15%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was K RD SW over Wahluke Branch Canal built?

It was built in 1969, making it 56 years old in 2025.

What condition is K RD SW over Wahluke Branch Canal 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 January 2023.

How much traffic does K RD SW over Wahluke Branch Canal carry?

About 229 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is K RD SW over Wahluke Branch Canal?

The structure is 44 ft (13.4 m) long with a longest span of 43 ft (13.1 m) and a deck 28 ft wide.

Who owns K RD SW over Wahluke Branch Canal?

It is owned by the County Highway Agency.