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<br />NAVAJO RESERVOIR <br />(SAN JUAN RIVER) <br /> <br /> <br />Water Year 1986 <br /> <br />The elevation of Navajo Reservoir at the beginning of water <br />year 1986 was 6,078 feet with 1,586,000 acre-feet of active <br />storage. It was planned that Navajo Reservoir would fill to <br />near its maximum elevation of 6,085 feet with an average 1986 <br />runoff. It was also planned to avoid the use of the spillw~y <br />since spills cause high levels of nitrification in the San Juan <br />River, detrimental to the blue ribbon quality trout population. <br /> <br />The April through July runoff forecast made in January 1986 <br />was 950,000 acre-feet, which was 150 percent of average. <br />Releases of up to 2,750 cis were maintained during January <br />through February 8 to contain this projected volume of runoff. <br />Navajo Reservoir was drawn down to elevation 6,050 feet at <br />this time. However, the February forecast of April through <br />July runoff declined to 800,000 acre-feet or 126 percent of <br />average which dictated that releases be dropped to 1,200 cfs. <br /> <br />ACTUAL RELEASES <br /> <br />WY 1986 <br /> <br />moo CFS <br />. <br /> <br /> <br />. <br /> <br />2 <br /> <br />o <br />oNDJFMAMJJASO <br /> <br />The March and April forecasts increased to 134 percent of <br />average forcing Navajo Dam releases up to 1,700 cfs during <br />these months. The May and June forecast was 157 percent of <br />average. flows were increased to a maximum of 3,500 cis in <br />June, and Navajo Reservoir reached a peak elevation of <br />6,084.0 on June 30, 1986. <br /> <br />The actual April through J uIy 1986 runoff volume into Navajo <br />Reservoir was 1,035,000 acre-feet, 163 percent of average. The <br />total water year 1986 inflow was 1,614,000 acre-feet, which was <br />169 percent of average. The minimum sustained release level <br />from Navajo Dam was 1,000 cfs while the maximum release <br />was 3,500 cfs. The peak inflow to Navajo Reservoir during the <br />1986 runoff was 9,000 cfs on April 2, 1986. The spillway at <br />Navajo Dam was not used. <br /> <br />NAVAJO RESERVOIR <br /> <br />Reservoir <br /> <br />Acre-feet <br /> <br />Elevation, feet <br /> <br />Maximum Storage <br />Inactive Storage <br />Surface Area, full <br />Reservoir Length, full <br /> <br />1,696,400 <br />660,500 <br /> <br />6,085 <br />5,990 <br />15,610 Acres <br />33 Miles <br /> <br />11 <br />