US Bridges

Lewis Road over Naches River-So. Channel

Fair

Yakima County, Washington · 00.50 E So Naches · Structure no. 081075000000000

Built
1953
72 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
29 ft
2 main spans
Daily traffic
143
2021 count
Owner
County
County Highway Agency

About this bridge

Lewis Road over Naches River-So. Channel is a wood or timber stringer/multi-beam or girder carrying Lewis Road over Naches River-So. Channel in Yakima 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 5 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 143 vehicles a day, roughly 5% of them trucks, projected to reach 171 by 2041. The structure is 29 ft (8.8 m) long and 23 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesLewis Road
CrossesNaches River-So. Channel
Location00.50 E So Naches
RouteCounty Highway 26670
CountyYakima County
StateWashington
Coordinates46.71962, -120.69456
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.7 US tons
Inventory rating19 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 20
Structure length29 ft (8.8 m)
Longest span14 ft (4.3 m)
Deck width23 ft (7 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic143 (2021)
Projected traffic171 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Lewis Road over Naches River-So. Channel built?

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

What condition is Lewis Road over Naches River-So. Channel 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 Lewis Road over Naches River-So. Channel carry?

About 143 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Lewis Road over Naches River-So. Channel?

The structure is 29 ft (8.8 m) long with a longest span of 14 ft (4.3 m) and a deck 23 ft wide.

Who owns Lewis Road over Naches River-So. Channel?

It is owned by the County Highway Agency.