The Lofty Reservoir Rehabilitation Project originally consisted of the removal of a portion of the top of the dam crest and installation of a concrete retaining wall for the full length of the crest to allow for a higher level of safety curing a probable maximum flood event.
Upon draining of the reservoir, several tension cracks appeared and the project was re-designed. The re-design eliminated the concrete retaining wall and entailed removal of a majority of the existing dam embankment. During the embankment replacement process, an extensive downstream drain field and seepage monitoring system was installed on both the left and right sides, which included filter diaphragms, perforated piping and seepage monitoring pits. Also included in this project was the installation of a new outlet conduit system consisting of an upstream sluice gate, 18” ductile iron pipe, end wall and a new concrete weir. The walls of the existing spillway were also raised to meet the elevation for the new embankment.