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II-4 completed in May of 1971 and the mapping accomplished for thls study (November 1974), approximately one foot of the dam was lost during the overtopping in 1973. Subsequent to the overtopping of the dam in May 1973, the State Engineer's Office sent a letter to J. Shattuck, the present owner of the dam, concerning certain improvements, as shown on the 1958 drawings. Specifically, the improvements specified are: 1) five foot of freeboard (spillway crest to the dam crest); 2) crest width to be 14 feet; and 3) spillway width to be 16 feet with 7:1 side slopes. The letter further states that until the dam improvements are completed, the water surface (normal maximum) is restricted to five foot below the lowest point in the dam (crest). Mr. Shattuck replied to the letter indicatin9 that "should I attempt to accomplish this work, several houses along the south shore would be inundated and approximately eleven acres of ny land would be flooded", Mr. Shattuck further stated that "if I comply with your letter telling me to drain the lake down to a point five feet below the lowest pOint in the dam, the whole lake will revert into nothing but a mud flat. The lake is only six feet deep". Copies of these two letters are included in Appendix A to this report. In conversation with several of the homeowners along the south shore area, the Hydro-Triad, Ltd. staff has determined the normal water surface of Hidden Lake is maintained at a level approximately one foot below the crest of the spillway. The exact mechanism or operation of the outlet to maintain this water surface level has not been established, but observations at various times during the course of the study have verified this nominal water surface level. The filling of the outlet pipe with concrete during the winter months of 1974-1975 may affect the regulation of the water surface.