US Bridges

S RD NW over Irrigation Lateral

Fair

Grant County, Washington · S NW 0.4 North of SR 28 · Structure no. 081375000000000

Built
1952
73 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
29 ft
1 main span
Daily traffic
786
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 1952, so it is 73 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 786 vehicles a day, roughly 24% of them trucks, projected to reach 1,200 by 2042. The structure is 29 ft (8.8 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 0.4 North of SR 28
RouteCounty Highway 31550
CountyGrant County
StateWashington
Coordinates47.23924, -119.89667
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionFebruary 2024
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 alignment8: Equal to present desirable criteria
Operating rating39 US tons
Inventory rating26 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadH 15
Structure length29 ft (8.8 m)
Longest span27 ft (8.2 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic786 (2020)
Projected traffic1,200 by 2042
Trucks24%
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$386,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S RD NW over Irrigation Lateral built?

It was built in 1952, making it 73 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 February 2024.

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

About 786 vehicles per day (2020 count), of which roughly 24% are trucks.

How long is S RD NW over Irrigation Lateral?

The structure is 29 ft (8.8 m) long with a longest span of 27 ft (8.2 m) and a deck 25 ft wide.

Who owns S RD NW over Irrigation Lateral?

It is owned by the County Highway Agency.