25GC. Canterbury Creek . — Enters the Willamette approximately 

 167^^ miles above the nouth, l|- miles dovmstream from the mouth of the 

 IfcKenzie River. It is L, miles long, and in reality is a small, lower 

 side channel of the McKenzie, winding northward near the town of 

 Colburg. It -was not surveyed. 



25DD0 McKenzie River .— (August 21-25, 1937, June 12-13, 1938j 

 Hanavan, Baltzo, Kolloen, Parkhurst, Wilding, Lobell, and Langton.) 

 Enters the Willamette River approximately 169 miles above the mouths 

 It is 86 miles long, of y;hich 82 miles were surveyed to the impassable 

 35-foot high Tamolitsh Falls, The McKenzie rises high in the Cascade 

 Range and is abundantly supplied with water throughout the year from 

 melting snov; accumulations and springs . Its drainage area is more than 

 1^300 square miles. Near Vida, Oregon, or 42 miles upstream, the mini- 

 mum recorded flow was 1,260 c.f.s., on November 7, 1930, September 13, 

 October 4, 8, and 9, 1931» The maximum estimated flow -was 60,000 c.f.s., 

 in the flood of January 6, 1923. The -water temperature ranged from 

 44 to 54° F., but temperatures up to 70° F., are known to have occurred 

 in some years. The stream gradient is moderate in the lower 62 miles, 

 increasing gradually above. For the most part the river extends 

 through a mountainous, wooded section, and a large volume of spring 

 water aids in maintaining a moderate water temperature throughout the 

 year. 



The ifalterville Power Canal takes off 25 miles above the mouth, 

 has a capacity of 80-1000 c.f.s., and is unscreened. It leads to the 

 Eugene lAinicipal Power Plant several miles below, and returns to the 

 river 17 miles above the mouth. In recent years the Oregon State fish 

 hatchery racks have been installed in the McKenzie a short distance 

 above this point, and a large number of adult Chinook salmon have en- 

 tered the V/alterville Canal, where there was considerable mortality. 

 Since 1947 the power canal return also has been racked to prevent salmon 

 from entering . 



The Leaburgh (Vida) Power Dam, located 37^- miles above the mouth, 

 is 15 feet high, and is equipped with tv/o efficient fishways. The 

 power canal has a capacity of 1,000 c.f.s., and the only fish protec- 

 tive device is a slow moving arrangement of suspended chains that does 

 not appear to be effective in barring fingerlings from the diversion. 

 The possible destruction of fingerlings at the power house should be 

 investigated as more adequate screens may be required. 



There is sufficient spawning area in the entire river for at least 

 80,000 Chinook salmon. Of this potential total, spawning area for ap- 

 proximately 50,000 fish is located above the Oregon State hatchery racks 

 near Hendricks bridge, and can be utilized only by those fish allowed 

 to pass through the racks. In recent years one-third to one-half the 

 run has been passed above the racks. The Oregon Fish Commission estimated 

 the total spring chinook run into the McKenzie River in 1947 to be 4,780 

 fish. Spavming has been observed throughout the main river and in 

 several of the larger tributaries, usually occurring in September. 



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