US Bridges

9 RD NW over Irrigation Lateral

FairPosted for load

Grant County, Washington · 9 NW .01 W of S · Structure no. 083117000000000

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
309
2021 count
Owner
County
County Highway Agency

About this bridge

9 RD NW over Irrigation Lateral is a wood or timber stringer/multi-beam or girder carrying 9 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 309 vehicles a day, roughly 18% of them trucks, projected to reach 424 by 2043. 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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Carries9 RD NW
CrossesIrrigation Lateral
Location9 NW .01 W of S
RouteCounty Highway 30250
CountyGrant County
StateWashington
Coordinates47.21844, -119.89701
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating36 US tons
Inventory rating25 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 span19 ft (5.8 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic309 (2021)
Projected traffic424 by 2043
Trucks18%
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 9 RD NW over Irrigation Lateral built?

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

What condition is 9 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 9 RD NW over Irrigation Lateral carry?

About 309 vehicles per day (2021 count), of which roughly 18% are trucks.

How long is 9 RD NW over Irrigation Lateral?

The structure is 39 ft (11.9 m) long with a longest span of 19 ft (5.8 m) and a deck 25 ft wide.

Who owns 9 RD NW over Irrigation Lateral?

It is owned by the County Highway Agency.