flume into a reservoir from vrhich it discharges through a power house 

 into the Bull Run River at a point about li- miles above the mouth of 

 the lattero The power house contains 4- high-speed turbines operating 

 under a 320 foot heado Both the Ifermot and Little Sandy diversions are 

 unscreened o However , the Oregon Fish Commission is negotiating with 

 the Portland General Electric Company for the installation of a rotary 

 screen on the Marmot Dam diversion.. At any time of the year a large 

 portion of both streams is diverted and during the summer months the 

 entire flows are usually taken except for the small amount allowed to 

 pass down a fish ladder at llarmot Ifemc It necessarily follovjs that 

 the great majority of downstream migrants from above these dams are 

 killed by passage through the powerhouse. During low vfater stages 

 there is no spill over these diversion dams, and on the main Sandy 

 there is often an 11 mile dry section from the confluence of the Bull 

 Run River to Tfermot Damo In order to alloy/ migratory fish to suc- 

 cessfully utilize the extensive spawning areas above Marmot Dam it 

 v/oold be necessary zo maxntain an adequate flov; in this stream sec- 

 tion.. 



There is a large air.cunt of spavming area in the Sandy River, and 

 the stream formerly supported large salmon runs. However,, the diffi- 

 culties imposed by the Marmot Dam and diversion, and the ext.reme fluc- 

 tuation in flow below the dam render it difficult to determine the 

 amount of sparming area actually available to salmono Under present 

 conditions it is probable that the low flow conditions below the dam 

 would render the stream of little value for the natural spavming of 

 fall Chinook and silver salmon. 



The Oregon Fish Commission operates a hatchery at the dam and 

 places racks across the stream at a point about 1/2 mile above the 

 dam where eggs are taken for artificial propagation » Spring Chinook^ 

 silver salmon, and steelhead trout are propagated at this station. 

 Some steelhead are taken for the hatchery in traps placed in the fishway 

 at Marmot Dam. 



Large runs of smelt enter the lovrer section of the river in most 

 years to spawn and they support extensive commercial and sport fisheries. 



Channel improvements on the lower river have greatly aided the entry 

 of migratory fish into the stream. The Sandy formerly entered the 

 Columbia through two mouths, known as the Big Sandy and Little Sandy 

 channels. The Oregon Game Commission dammed the Big Sandy channel in 

 1938, concentrating the entire river flow in the Little Sandy channel. 

 Additional work on the dam was done by the Federal Government in 19^.0, 

 and at that time extensive bank-protective works were installed. 



