US Bridges

S RD NW over Irrigation Lateral

Fair

Grant County, Washington · S NW 0.01 S of 9 · Structure no. 083229000000000

Built
1953
72 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
39 ft
2 main spans
Daily traffic
663
2020 count
Owner
County
County Highway Agency

About this bridge

S RD NW over Irrigation Lateral is a wood or timber stringer/multi-beam or girder carrying S RD NW over Irrigation Lateral in Grant County, Washington. It was built in 1953, so it is 72 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 663 vehicles a day, roughly 23% of them trucks, projected to reach 1,000 by 2042. The structure is 39 ft (11.9 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesS RD NW
CrossesIrrigation Lateral
LocationS NW 0.01 S of 9
RouteCounty Highway 31550
CountyGrant County
StateWashington
Coordinates47.21814, -119.89666
Functional classRural Minor Collector

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 inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 alignment6: Equal to present minimum criteria
Operating rating45 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 15
Structure length39 ft (11.9 m)
Longest span20 ft (6.1 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic663 (2020)
Projected traffic1,000 by 2042
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S RD NW over Irrigation Lateral built?

It was built in 1953, making it 72 years old in 2025.

What condition is S RD NW over Irrigation Lateral 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 December 2023.

How much traffic does S RD NW over Irrigation Lateral carry?

About 663 vehicles per day (2020 count), of which roughly 23% are trucks.

How long is S RD NW over Irrigation Lateral?

The structure is 39 ft (11.9 m) long with a longest span of 20 ft (6.1 m) and a deck 25 ft wide.

Who owns S RD NW over Irrigation Lateral?

It is owned by the County Highway Agency.