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APPENDIX B <br /> A Summary of the Major Construction History of Lake Decatur Dam <br /> The City owns and operates the Lake Decatur Dam located on the Sangamon River just west of <br /> Business Route U.S. 51. Built in 1922, the dam provides an impoundment for the City's source of <br /> drinking water. In 1955 bascule gates were added to the concrete spillway to increase the lake level <br /> from elevation 610 to 614.5. The following table summarizes the history of major construction <br /> projects for the Lake Decatur Dam: <br /> Year Activity <br /> 1922 Ori inal Construction <br /> 1950's Fish ladder removed <br /> 1954-55 Flashboards removed and bascule gate installed <br /> Sluice gate replacement and trash racks installed <br /> 1955-1996 Sluice ates reconditioned <br /> 1955-1996 Resurfaced downstream face of spillway access platform <br /> 1995 Overla laced on downstream face of s illway <br /> 1996 Shotcrete a lied to left and ri ht abutment walls <br /> 1998 North bascule gate hydraulic cylinders refurbished (Cylinders 1 thru 4) <br /> 2000 South bascule ate h draulic cylinders refurbished (C linders 5 thru 8) <br /> 2000 Approximately 30 concrete panels on upstream slo e of ri ht embankment replaced <br /> 2000 Pile cap and all concrete panels along the downstream right riverbank training wall <br /> replaced. <br /> 2001 New joints saw cut into s illwa overla to match ori inal dam 'oints <br /> 2001 Spalling along upstream face of outlet works and downstream face of spillway <br /> patched <br /> 2001 New ri ra laced downstream of stillin basin and alon the left river bank <br /> 2004 New sluice gate lift mechanism at the lower tail water dam <br /> 2005 S allin alon u stream face of outlet works structure atched <br /> Page � 5 <br />