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1940 that reveal valley oak woodlands connecting the two drainage systems along natural <br /> drainage corridors. <br /> During periods of historically significant runoff, Tracy Lake has overflowed into the <br /> Mokelumne River and the river has also backed up into Tracy Lake. The previous land <br /> owner, Angelo Brovelli, said that during the large flood of 1950 the river overflowed into <br /> the lake, completely filling it and stocking it with fish. He also reported that prior to <br /> construction of the dams upstream, the Mokelumne River would flood the whole area <br /> frequently, and that the levee that runs along the western and northern edge of the lake area <br /> was constructed to prevent flooding from the Mokelumne River. <br /> Overflow Between The Lake and the River <br /> Examination of topographic maps indicates that overflow between the lake and the river <br /> would have occurred naturally at about elevation +25 feet along the western edge of the <br /> property, where there is lower ground along the river. However, construction of the levee <br /> along this western boundary of the property now prevents that from happening. The large <br /> storm that occurred February 12-19, 1986 produced enough runoff in Jahant Slough to <br /> completely fill the lakes to an approximate elevation of+26 feet.Examination of aerial <br /> photographs taken on February 22, 1986 indicate that both lakes and the river were at <br /> about the same elevation and that the levee, which runs along the western edge of the <br /> property, prevented the joining of lake and river at that point. The river was then flowing at <br /> approximately 5,000 cubic feet per second (cfs) as measured at the Woodbridge gauging <br /> station which is maintained by the U.S.G.S. Comparison of this flow rate with Peak Rain <br /> and Snowmelt Flood Frequency Curves prepared by the Army Corps of Engineers for <br /> Camanche Reservoir, which regulates the flow downstream in the Mokelumne River, <br /> indicate that this flow rate corresponds to about a 50 year flood release. Furthermore, these <br /> Buckeye Ranch Resource Plan (November, 1993) <br /> 27 <br />