US Bridges

9 RD NW over Irrigation Lateral

Good

Grant County, Washington · 9 NW 0.3 E of S NW · Structure no. 083222000000000

Built
1952
73 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
29 ft
1 main span
Daily traffic
265
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 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 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 265 vehicles a day, roughly 9% of them trucks, projected to reach 385 by 2043. 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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Carries9 RD NW
CrossesIrrigation Lateral
Location9 NW 0.3 E of S NW
RouteCounty Highway 30250
CountyGrant County
StateWashington
Coordinates47.21844, -119.88989
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 inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating28 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 span28 ft (8.5 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic265 (2021)
Projected traffic385 by 2043
Trucks9%
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$1.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 9 RD NW over Irrigation Lateral built?

It was built in 1952, making it 73 years old in 2025.

What condition is 9 RD NW 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 December 2023.

How much traffic does 9 RD NW over Irrigation Lateral carry?

About 265 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is 9 RD NW over Irrigation Lateral?

The structure is 29 ft (8.8 m) long with a longest span of 28 ft (8.5 m) and a deck 25 ft wide.

Who owns 9 RD NW over Irrigation Lateral?

It is owned by the County Highway Agency.