US Bridges

Lateral C Rd. over Toppenish Creek

FairPosted for load

Yakima County, Washington · .43 N Pumphouse (i) · Structure no. 083397000000000

Built
1957
68 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
116 ft
5 main spans
Daily traffic
115
2021 count
Owner
County
County Highway Agency

About this bridge

Lateral C Rd. over Toppenish Creek is a wood or timber stringer/multi-beam or girder carrying Lateral C Rd. over Toppenish Creek in Yakima County, Washington. It was built in 1957, so it is 68 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 115 vehicles a day, roughly 5% of them trucks, projected to reach 140 by 2041. The structure is 116 ft (35.4 m) long and 27 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesLateral C Rd.
CrossesToppenish Creek
Location.43 N Pumphouse (i)
RouteCounty Highway 50350
CountyYakima County
StateWashington
Coordinates46.32294, -120.52295
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating5 US tons
Inventory rating4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans5
Design loadHS 15
Structure length116 ft (35.4 m)
Longest span24 ft (7.3 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic115 (2021)
Projected traffic140 by 2041
Trucks5%
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 substandard load-carrying capacity or roadway geometry
Estimated improvement cost$4.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Lateral C Rd. over Toppenish Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is Lateral C Rd. over Toppenish Creek 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 March 2023.

How much traffic does Lateral C Rd. over Toppenish Creek carry?

About 115 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Lateral C Rd. over Toppenish Creek?

The structure is 116 ft (35.4 m) long with a longest span of 24 ft (7.3 m) and a deck 27 ft wide.

Who owns Lateral C Rd. over Toppenish Creek?

It is owned by the County Highway Agency.