US Bridges

Lat C Rd. over Usis Main Canal

FairPosted for load

Yakima County, Washington · 00.06 S Lateral 1 · Structure no. 079712000000000

Built
1941
84 years old
Condition
Fair
inspected February 2023
Type
Slab
Concrete Continuous
Length
81 ft
4 main spans
Daily traffic
170
2023 count
Owner
County
County Highway Agency

About this bridge

Lat C Rd. over Usis Main Canal is a concrete continuous slab carrying Lat C Rd. over Usis Main Canal in Yakima County, Washington. It was built in 1941, so it is 84 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 170 vehicles a day, roughly 5% of them trucks, projected to reach 243 by 2043. The structure is 81 ft (24.7 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesLat C Rd.
CrossesUsis Main Canal
Location00.06 S Lateral 1
RouteCounty Highway 50350
CountyYakima County
StateWashington
Coordinates46.47833, -120.52167
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
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 alignment6: Equal to present minimum criteria
Operating rating23.6 US tons
Inventory rating18.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length81 ft (24.7 m)
Longest span20 ft (6.1 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic170 (2023)
Projected traffic243 by 2043
Trucks5%
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$3.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Lat C Rd. over Usis Main Canal built?

It was built in 1941, making it 84 years old in 2025.

What condition is Lat C Rd. over Usis Main Canal 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 2023.

How much traffic does Lat C Rd. over Usis Main Canal carry?

About 170 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Lat C Rd. over Usis Main Canal?

The structure is 81 ft (24.7 m) long with a longest span of 20 ft (6.1 m) and a deck 26 ft wide.

Who owns Lat C Rd. over Usis Main Canal?

It is owned by the County Highway Agency.