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.VIINNEHAHA CREEK <br />WATERSHED DISTRICT <br />;oil <br />tau ■100TOU41 <br />P.O. Bo: 387, Wayzata, Minnesota 55392 <br />WAN"t Of U00"”: <br />4nA '+ CsMs�. ,"� • MNr, L tv&w. . l.b� E Tier..* a G dmoodr. • 11:•a.a a Ca+ntt <br />HEADWATLHS CONTHUL 6THUCTUHL <br />MANAGEMENT POLICY AND OPERA`1'1 NG PROCEDURLS <br />MARCH 1.L- 1983 _ _MARCH _� 1986 _ _ <br />INTRODUCTION <br />The Headwaters Cor.`rol Structure at Ura.y's bay is the outlet <br />of Lake Minnetonka to N; inehahe Creek. It is an adjustable <br />structure that controls Lake Minnetonka levels and discharge to <br />Minnehaha Creek. The structure: was constructed by the Minnehaha <br />Creek Watershed District in 1979• <br />Lake levels and discharge have been controlled at this <br />location since 1897 when a fixed crest structure was constructed <br />to maintain as nearly as practicable tLe lake level at a height of <br />928.t35 NGVD, 1929 datum. This structure was a wooden weir wtilch <br />was subsequently repaired in 1932 and again in 1944. <br />Survey data of record in the 1960's and 1970's show t."ie <br />actual cres„ elevation of the repaired weir varied in height alo%�, <br />Its length. This uneven crest elevation was apparently aue to ice <br />pressures and/or frost heaving. The survey data also show the <br />lowest point on the weir crest was at at. :rc 'slate elevation of <br />9 8.6 NGVD, 1929 datum. <br />In 1979, when the Headwaters Control -structure became <br />operational, the fired wooden weir was also reconstructed. Tr,e <br />new weir to constructed of galvanized steel sheet pilir'ia material, <br />at the same location, with an even crest at elevation 93C.0 NGVU, <br />1929 datum. <br />As a result of a 1975 joint petition front the Minnehaha Creek <br />Watershed District and the Lake Minnet .., (conservation District, <br />the Minnesota Department of Natural Rebour ;es (DNR) conducted an <br />Ordinary High Water investigation of Lake Minnetonka. After <br />conducting neressery field work and analyzing pt;ysical and <br />historical data and records, the DNH issued its report in January, <br />1976. After holding public meetings the Commissioner of Natural <br />Resources concluded tl,-- Ordinary High Water level on Lake <br />Minnetonka is at elev, on 929.4 NgVD, 1929 datu.n. <br />1 of' 1 1 <br />