US Bridges

E RD SW over Irrigation Lateral

Fair

Grant County, Washington · E SW 1.2 N of 11 SW · Structure no. 083950000000000

Built
1953
72 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
51 ft
2 main spans
Daily traffic
414
2021 count
Owner
County
County Highway Agency

About this bridge

E RD SW over Irrigation Lateral is a wood or timber stringer/multi-beam or girder carrying E RD SW 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 414 vehicles a day, roughly 19% of them trucks, projected to reach 650 by 2043. The structure is 51 ft (15.5 m) long and 25 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesE RD SW
CrossesIrrigation Lateral
LocationE SW 1.2 N of 11 SW
RouteCounty Highway 12990
Coordinates46.94172, -119.60059
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 inspectionNovember 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41 US tons
Inventory rating29 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 15
Structure length51 ft (15.5 m)
Longest span25 ft (7.6 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic414 (2021)
Projected traffic650 by 2043
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 relocation of road
Estimated improvement cost$113,000 (2018 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was E RD SW over Irrigation Lateral built?

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

What condition is E RD SW 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 November 2024.

How much traffic does E RD SW over Irrigation Lateral carry?

About 414 vehicles per day (2021 count), of which roughly 19% are trucks.

How long is E RD SW over Irrigation Lateral?

The structure is 51 ft (15.5 m) long with a longest span of 25 ft (7.6 m) and a deck 25 ft wide.

Who owns E RD SW over Irrigation Lateral?

It is owned by the County Highway Agency.