5.7. SR 12-06-2010 - Laserfiche WebLink

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future scour holes and this repair does not fully address the problem. Alonger- lasting repair across the downstream apron is estimated to cost $6 million to $8 million. Would repairs resolve all long-term issues with the dam? Consultants advising Three Rivers Park District say no. As with any major infrastructure, ongoing maintenance and rehabilitation will be required, some of which could be costly. The downstream apron is one component of the dam structure. Additionally, the rubber gates experience annual wear and tear and may be problematic over time and will need to be replaced. Wasn't the dam fully rebuilt just 10 years ago? No. Contrary to a recent media report, the dam was never fully rebuilt, In 1996- 1997, the walkway across the dam and the broken and twisted steel gates were replaced. The gates were replaced with a new computerized gate system that primarily used rubber gates. Why does Coon Rapids Dam need so many repairs? The underwater infrastructure of the dam was built in 1913-14 with an expected life of 50 years. It is currently 97 years old. Consultants say the dam has already far outlived the engineering expectations of its design. Given its age, needed repairs will grow in frequency, with the most significant being to the underwater infrastructure and the gate system. If these major issues are addressed, life expectancy can be significantly improved. Who pays for dam repairs and upkeep? The taxpayers of Suburban Hennepin County fund the annual upkeep and operation of the dam through taxes paid to Three Rivers Park District. Over the years, the Park District has secured funding assistance from the State of Minnesota and the Metropolitan Council for some repairs and in funding of the walkway and recreational improvements. Historical Background 1913-1914 -The Coon Rapids Dam and powerhouse were built by NSP to provide hydroelectric power. Power was generated until 1966. 1958 -The Park District's first Vision Plan identifies the desire to provide public access to parkland along the Mississippi River. 1969 -The Park District acquired 225 acres of parkland straddling both sides of the river as a gift from NSP. The gift included the 1,000-foot dam and some funds to address immediate repair needs. The acquisition agreement expressed the Park District's concern far the financial viability of funding for future dam repairs. 1970 -The Park District and NSP jointly commissioned a structural analysis of the dam and identified needed repairs. 1975 -The Park District, with financial assistance from the state of Minnesota and NSP, contracted far repairs of the dam and initiated development of the parkland on both sides of the river.