When the Wenatchee River anus first surveyed in 1935 the only- 

 protective device in the Dryden Ditch was an ineffective electric 

 fish screeno Shortly thereafter, a battery of 7 rotary screens 

 was installed in the canal a short distance above the power planto 



The Leavenworth Hatchery Diversion Canal was constructed in 

 1940 one mile above the town of Leavenwortho It has no dam, the 

 water being diverted directly from the side of the stream channelo 

 The hatchery intake from this canal is screened, and any fish in 

 the canal can continue on through to lower Icicle Creek and thence 

 into the Wenatchee River o 



The Tumwater Power Plant of the Paget Sound Power and Light 

 Company is located about 28 miles upstream, in Tumwater Canyon. 

 The power diversion, originating at the dam 2 miles farther 

 upstream, and amounting to a maximum of 550 c.f .s,, operates a 

 low speed turbine and is returned through the tailrace to the 

 river at this pointo The flow in the intervening river channel 

 becomes very low at certain water stages, and at such times this 

 section is a definite hazard and a partial barrier to the upstream 

 migration of fish. 



The Tumwater Power Dam of the Puget Sound Power and Light 

 Company has a drop of about 15 feet onto a wide downstream apron* 

 Passage for fish is provided by means of a multiple entrance ladder 

 on the north side of the dam. Frequent fluctuations in the water 

 level above the dam occur because of the slight storage capacity 

 and irregular power demands. This in turn requires frequent 

 adjustment of the flow in the fishway during the periods of 

 upstream migration. The power diversion is screened at the intake. 



12Ao Mission Creek o — (June 26, 1935; Suomela and Shuoaan, 

 June 6, 1936| Burrows and Yfhiteleather.) Enters the Wenatchee 

 River about 12 l/2 miles upstream, at Cashmere, Washington. The 

 stream is 19 miles long, and the lower 17 miles were surveyed. 

 The gradient is slight to moderate and there is only a small 

 percentage of large rubble. The lower half of the stream has been 

 straightened and dredged, and some portions provided with cribbing 

 along the banks for protection and drainage during severe spring 

 freshets; this process has eliminated pools and most marginal 

 vegetation through the narrow, farmed valley. The lower 5 miles 

 were polluted with household and barnyard sewage and ";arbage. In 

 spite of this poor condition a few steelhead manage to ascend in 

 May when the creek is high. There were 13 unscreened irrigation 

 diversions and 3 low dams, two of them temporary. These diversions 

 take the entire flow during the irrigation season and the stream 

 usually is almost dry and therefore inaccessible a short distance 

 above its mouth during the svimmer and fall months; it is therefore 

 of no value to salmon. 



64 



