US Bridges

D RD SW over Irrigation Lateral

GoodPosted for load

Grant County, Washington · D SW 0.7 S of Frenchmen · Structure no. 082662000000000

Built
1959
66 years old
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
43 ft
2 main spans
Daily traffic
214
2022 count
Owner
County
County Highway Agency

About this bridge

D RD SW over Irrigation Lateral is a wood or timber stringer/multi-beam or girder carrying D RD SW over Irrigation Lateral in Grant County, Washington. It was built in 1959, so it is 66 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. Its operating status is: posted for load restriction.

It carries about 214 vehicles a day, roughly 11% of them trucks, projected to reach 325 by 2041. The structure is 43 ft (13.1 m) long and 26 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesD RD SW
CrossesIrrigation Lateral
LocationD SW 0.7 S of Frenchmen
RouteCounty Highway 18990
Coordinates46.95466, -119.579
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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment8: Equal to present desirable criteria
Operating rating39 US tons
Inventory rating28 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 15
Structure length43 ft (13.1 m)
Longest span23 ft (7 m)
Deck width26 ft (7.8 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic214 (2022)
Projected traffic325 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 D RD SW over Irrigation Lateral built?

It was built in 1959, making it 66 years old in 2025.

What condition is D RD SW over Irrigation Lateral 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 November 2024.

How much traffic does D RD SW over Irrigation Lateral carry?

About 214 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is D RD SW over Irrigation Lateral?

The structure is 43 ft (13.1 m) long with a longest span of 23 ft (7 m) and a deck 26 ft wide.

Who owns D RD SW over Irrigation Lateral?

It is owned by the County Highway Agency.