US Bridges

T RD NW over Irrigation Lateral

Good

Grant County, Washington · T NW .5 N of 12 · Structure no. 084786000000000

Built
1952
73 years old
Condition
Good
inspected February 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
28 ft
1 main span
Daily traffic
197
2021 count
Owner
County
County Highway Agency

About this bridge

T RD NW over Irrigation Lateral is a wood or timber stringer/multi-beam or girder carrying T 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 197 vehicles a day, roughly 50% of them trucks, projected to reach 210 by 2043. The structure is 28 ft (8.5 m) long and 25 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesT RD NW
CrossesIrrigation Lateral
LocationT NW .5 N of 12
RouteCounty Highway 32350
Coordinates47.27265, -119.91806
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 protection7 GoodSome minor problems.
Last inspectionFebruary 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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating25 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadH 15
Structure length28 ft (8.5 m)
Longest span27 ft (8.2 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic197 (2021)
Projected traffic210 by 2043
Trucks50%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 T RD NW over Irrigation Lateral built?

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

What condition is T 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 February 2023.

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

About 197 vehicles per day (2021 count), of which roughly 50% are trucks.

How long is T RD NW over Irrigation Lateral?

The structure is 28 ft (8.5 m) long with a longest span of 27 ft (8.2 m) and a deck 25 ft wide.

Who owns T RD NW over Irrigation Lateral?

It is owned by the County Highway Agency.