US Bridges

16th Ave. S. over Ahtanum Creek

Good

Yakima County, Washington · 00.11 N Gilbert RD · Structure no. 079873000000000

Built
1957
68 years old
Condition
Good
inspected March 2023
Type
Channel Beam
Concrete
Length
30 ft
1 main span
Daily traffic
1,650
2021 count
Owner
County
County Highway Agency

About this bridge

16th Ave. S. over Ahtanum Creek is a concrete channel beam carrying 16th Ave. S. over Ahtanum 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 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 1,650 vehicles a day, roughly 5% of them trucks, projected to reach 1,980 by 2041. The structure is 30 ft (9.1 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries16th Ave. S.
CrossesAhtanum Creek
Location00.11 N Gilbert RD
RouteCounty Highway 30490
CountyYakima County
StateWashington
Coordinates46.55167, -120.52667
Functional classUrban Collector

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 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating23.3 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckOther
Main spans1
Design loadH 20
Structure length30 ft (9.1 m)
Longest span29 ft (8.8 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,650 (2021)
Projected traffic1,980 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 16th Ave. S. over Ahtanum Creek built?

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

What condition is 16th Ave. S. over Ahtanum Creek 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 March 2023.

How much traffic does 16th Ave. S. over Ahtanum Creek carry?

About 1,650 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is 16th Ave. S. over Ahtanum Creek?

The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.8 m) and a deck 24 ft wide.

Who owns 16th Ave. S. over Ahtanum Creek?

It is owned by the County Highway Agency.