Drought Impacts to Bull Trout in the Yakima Basin – 2001 (2005?) John Easterbrooks, Region 3 Fish Program Manager
“Adfluvial” (lake dwelling, stream spawning) bull trout populations in three Yakima Basin irrigation storage reservoirs (Keechelus, Kachess, and Rimrock) were affected by the severe drought of Similar conditions are anticipated in Blocked upstream passage into spawning tributaries in late summer as the reservoirs are drained is the primary impact. Lower stream flows in 2005 may cause passage problems to occur earlier in the summer, depending on the rate of reservoir drawdown. Corrective actions were implemented at Kachess and Rimrock reservoirs in 2001 to improve passage conditions for mature adults to prevent loss of a year class of juvenile production.
Gold Creek – Keechelus Reservoir (headwaters of the Yakima River near Snoqualmie Pass) (no remedial action because of upstream flow problems)
Lower Gold Cr. and Keechelus Reservoir
Alluvial Fan at Mouth of Gold Cr.
Gold Cr. Impassable Conditions
Gold Creek – July 20
August 1August 15
Box Canyon Creek – Kachess Reservoir
Overview of channel modification on Kachess Reservoir lake bed
Construction of passage flume
Straw bale, T-post & Plastic Sheet Flume Design
Lower end of Box Canyon Cr. bull trout passage flume
Passage flume looking upstream
Finished flume with rock weirs to create a series of pools
Mouth of Box Canyon Cr. flume and Kachess Reservoir
First weir at mouth of flume and attraction flow
Adult bull trout in Box Canyon Cr. passage flume
Box Canyon flume after fall rains
Indian Creek – Rimrock Reservoir (upper Tieton River basin near White Pass; tributary to the Naches River)
Multiple channels at mouth of Indian Cr.
Plastic and straw bale wing dam flow diverter
Indian Cr. with flow diverter (left) and N.F. Tieton River (right)
After fall rains in October, 2001
South Fork Tieton R. – Rimrock Reservoir Barrier waterfall develops when reservoir storage content drops below 127,000 acre- feet. USBR attempts to operate reservoir to stay above that level through Aug. 12 to provide bull trout passage. Late in the season, the falls and shallow, multiple channels across the lake bed presents a hazard to post-spawn adults returning to the lake.
S.F. Tieton Falls, height = 10 meters, reservoir content 48,000 acre-feet
S.F. Tieton R. below falls across Rimrock Reservoir lake bed
Mouth of S.F. Tieton R. and Rimrock Reservoir at 48,000 ac-ft.