Status and Trends - Fish
subbasinYakima Subbasin bar By the 1970s and 1980s, all of the Yakima River salmonid stocks were either extirpated or severely depressed. Summer-run Chinook were extirpated from the Yakima Basin by 1970, while coho were declining until they were gone by the early 1980s. By the 1980s and 1990s, adult spring Chinook and steelhead returns were less than 3,500 and 1,000, respectively. 

Yakima Subbasin fish infographics




Comprised of four populations: Toppenish, Satus, Naches and Upper Yakima


Returns: Returns increased by 2,019 fish per year (annual average) 2008-2018 versus 1997-2007


Redd counts: Increased somewhat through the Accord period


Wild smolt-to-adult index 2002-2014: 4.95% (average, McNary-McNary)

Yakima SteelheadYakima Steelhead Tributaries


Yakima Summer Chinook


 Summer Chinook

Extirpated from the Yakima Subbasin by 1970


Reintroduced with Yakama Nation juvenile releases starting in 2009


Goal: Self sustaining locally-adapted population contributing to the fishery

 Spring Chinook

Returns: Although not as high during the Accord period as in the early 2000s, annual increases have been observed


Redd counts: Lower during the Accord period than in the early 2000s; however, spatial distribution increased in underutilized habitat


Wild smolt to-adult Index: brood year 2000-2013 is 2.38% (average, Prosser-Yakima mouth)

Yakima Spring Chinook


Yakima Fall Chinook


 Fall Chinook

Escapement: Contributing to Treaty fishery, 10-year average escapement is 5,279 fish


Spatial distribution: Supplemented by Yakama Nation from 1983, distribution increasing throughout the Yakima Subbasin


Extirpated from the Yakima Basin in the early 1990's, the Yakama nation began reintroducing adults in 2009


2013: First reintroduced fish spawned at Lake Cle Elum return as adults.


2013-2018: Average return 1,380 fish (Prosser count)

Yakima Sockeye


Yakima Coho



Extirpated from the Yakima Basin in the early 1980's, reintroductions began in 1985.


2008-2018: Prosser Dam adult counts averaged 5,443 coho annually.


2018: Construction starts on hatchery  that can produce 700,000 smolts

Pacific Lamprey

Documented increased distribution and abundance in all translocation subbasins


Transported 1,238 adults from Lower Columbia Dams (average ~1,000/yr)


2017: 561 adults counted at Prosser Dam, more than 7 times previous counts

Yakima Lamprey