Fish-passing facilities include the Washington Shore fish ladder 

 at the north end of the spillway dam and the Bradford Island fish ladder 

 with entrances on the south end of the spillway dam and on the north end 

 of the powerhouse. Fish locks are located at each end of the spillway dam 

 and on the south end of the powerhouse j these have not been used exten- 

 sively, but are available in case of emergencies. 



The Washington Shore ladder is 37 feet wide, and the Bradford 

 Island ladder is hO feet wide. Both ladders narrow to 30 feet in the 

 lower sections where they are usually flooded by tailwater. Each ladder 

 circles around the end of the dam from the lower to the higher water level. 

 At l6-foot intervals th^re are cross partitions 6 feet in height (fig. 2). 

 The toT5 of each successive cross partition, or weir, is 1 foot higher than 

 the one next below. These weirs continue up the ladder to the elevation 

 level of 70 feet. Above this point the ladders are like a level-floored 

 flume. At l6-foot intervals along this up^er section there. are guides in 

 which stop logs can be added to form weirs. In this 'jay additional pools 

 can be added to extend the steps up to the high forebay level of 82.5 feet. 



Water flows down the ladder, spilling over each successive weir, 

 and forms a series of pools, each one a foot lower than the one above 

 (figo 3) . In each ifieir between pools there is at the bottom a submerged 

 opening (fi^'. 2) 2 feet square, through which fish may pass inthoi^t coraing 

 to the surface. These openings alternate from near one side to near the 

 other in successive weirs. 



At both sides of the spillxjay dam at the lower end of the fishways 

 are expanded entrances to the ladders which are supplied with auxiliary 

 water through gratings in the floor. These are called collecting systems. 

 Their purpose is to supply sufficient attraction water so that the fish can 

 find the ladders. A collecting system extends all across the lower face of 

 the powerhouse, and the flow within this system can be directed to orient 

 the fish to the fish-passing facilities on either side or both sides of the 

 powerhouse. 



The UO~foot-wide ladder usually carries approximately 200 second- 

 feet of flow from headwater. Approximately 20 second-feet of this passes 

 through the 2-foot-square orifice in each weir; the remainder flows over the 

 crest of the weir. This quantity of flow causes the water level in each 

 pool to be about 12 inches higher than the crest of the weir below it. The 

 water surface "draws do^m" as it passes over the weir, to give a depth of 

 approximately 10 inches over the crest of the weir (fig. 3). 



The Washington Shore collection system is designed to supply an 

 additional 1,000 second-feet of water. A similar set of facilities at the 

 south end of the spillway is desi^-,Tied to supplj'' the spillway branch of the 

 Bradford ladder with 1,000 second-feet. Two auxiliary iijater intakes which 

 supply the powerhou^-e collection system have a combined capacity of 2,U00 



