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A <br />cluster no. 6 were at or near the water surface. Most of the instream cover is below the water <br />surface at the flow observed September 18. <br />Boat chute no. 6 and boulder cluster no. 7. Boat chute 6 is similar to boat chute 5 with two pilot <br />rocks to show boaters where the main chute is. It controls water, constricts it to the center of the <br />channel. A large scour pool has developed in the center of the channel through the boat chute <br />with deposition downstream. Boulder cluster no. 7 was not evident and is either below the water <br />surface or covered by debris that is scoured out of boat chute no. 6. <br />Boat chute no. 7. The water is controlled to the right with a pool formed upstream. There is an <br />intermediate pool that has been built into the boat chute and a plunge pool downstream. This <br />boat chute has a drop of approximately 4 to 6 feet based on observation. It is fully grouted <br />through the length of the boat chute with a more sever drop through this chute than the other <br />upstream boat chutes except for boat chute no. 1 at just below C470. Boat chute nos. 8 and 9 <br />have the same features as boat chute no. 7. Boat chute no. 8 pushes flows to the left. Boat chute <br />no. 9 is like boat chute no. 7 and pushes flow to the right. All three of these boat chutes seem to <br />be passable by fish at the flows observed. They also provide intermediate resting areas through <br />the boat chute for fish moving upstream. Large pools are formed upstream of each boat chute by <br />the control of the water surface from grouted boulders in the boat chute itself. This upstream <br />pool provides habitat for fish at the low flows. <br />a <br />Habitat Control Structure Investigations South Platte River <br />in South Platte Park Downstream Of C -470 Page 5 <br />Miller Ecological Consultants, Inc. November 6, 1998 <br />