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Changes In Water Use and Supplies Prior To <br />1990 ’ s <br />• Increased Vegetation in channel due to low flow conditions <br />• Mid - 1950s to present: Full operation of Colorado - Big Thompson <br />project and transition from agricultural to M&I uses <br />• Mid - 1950s to present: Significant increases in agricultural use of <br />ground water supplies <br />• 1955 to 1982: Large dam construction or rehabilitation occurred <br />(Gross Reservoir, Boulder Reservoir, Button Rock Reservoir, <br />Spinney Mountain Reservoir, Standley Lake Reservoir) <br />• Mid - 1960s to present: Roberts Tunnel deliveries of Blue River water <br />supplies <br />36 <br />