35 



Table 3- Escimaced number of fall chir.ook passing Z.ower Granite Dam, IS'S- 

 1994. 



' Source: Dygert (1994); note : these estimates assume no straying of non- 

 hatchery fish and are not adjusted for hatchery straying prior to 1983. 

 All juveniles released from Lyons Ferry Hatchery have been marked with CWTs 

 during the past few years and all returns in 1994 have CWTs. 



2 Source: Waples eC al (1991) and Dygert (1994); strays from Umatilla, Priest 

 Rapids, and Yakima (and perhaps other hatcheries) are included in this 

 category. The majority of Che Columbia River strays have been from Umacilla 

 releases; all juveniles released inco Che Umacilla have been marked with 

 CWTs during the past few years and all returns of Chis scock in 1994 have 

 CWTs. The Umatilla releases have occurred since 1983; poor acclimation of 

 juveniles prior Co release and lack of sufficienc wacer for spawning 

 concribute to increased straying of these hatchery fish. The brood source 

 for Umatilla releases are fall Chinook migrating over Bonneville Dam after 

 August, the same time frame Chat Snake River fall chinook migraCe past this 

 structure . 



^ Source: ODFW & WDP (1991 & 1994) . 



* Hatchery strays may have passed Lower Granite Dam prior Co 1983, but there 

 is no basis for estimating numbers due to lack of hatchery fish being coded 

 wire tagged prior to this time; source: Waples eC al (1991). 



' Source for all 1994 data: Mike Matylewich (personal communication). 



Total hatchery strays over Lower Granite Dam in 1994 estimated to be 162 

 fish; Che number of Lyons Ferry versus Columbia River strays unknown «C this 

 time . 



Table 4. Frsporticr. of fall chinook passing upstrea-n cf Lower Gra.-.ite Da- 

 that have been documented to have been Snake River a.".d Columbia 

 River strays and that are presumed to have entered the spawni.ig 

 population, 1983-1994.^ 



