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I I I I I I I I I I I I I I I I I I I Memorandum to Mr. Ioannides April 28, 1986 Page 4 FLORIDA AVENUE RUBBLE DAM Physical Characteristics: Approximately 6' drop. Constructed of concrete rubble and rock stacked up across the river. A concrete portage landing has been constructed on the right bank. A pump station is located on the left bank, just upstream of the drop. Analysis 1. Navi~ility. There is no man-made boat chute through the dam, but ere is a naturally washed-out "chute" along the left bank. The drop is too nn.lch for beginner boaters, and although the water pours througKln a smooth, even pattern, a large "hole" awaits the boater at the bottom, then a long series of randomly-placed sharp concrete chunks form a difficult obstacle course. At high water level, the "hole" can be large enough to capsize large rafts. 2. Rescue Compatibility. Rescue is difficult due to the fact that often the chute (the majority of current spreads out through the center of the river) leaves a difficult area to access with many sharp chunks of concrete on the bank and in the bed of the river. 3. Cost and Ease of Construction. No boating improvements have been constructed. 4. Appearance. The dam is very unsightly, with tons of broken concrete with rebar dumped in the river. 5. ~ration and Maintenance. The broken concrete catches trash and e ris requiring periodic maintenance. 6. The stacked concrete chunks are gradually shifted and rearranged by the action of the water, requiring periodic reconstruction. Stabili tih The structure is unstable. The water is gradually eroding e rubble from the dam and depositing it downstream, Other Ve~ difficult for fish migration. Good signage and portage trails have been installed, but portage landing has been eroded.