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<br />Navajo Reservoir
<br />[San Juan River]
<br />
<br />
<br />Water Yaar 1883
<br />At the beginning at water year 1883,
<br />Navajo Reservoir was at elevation 6072 feet
<br />with acanlant of 1 ,506,000 acre-feet. The
<br />reservoir was gradually lowered to elevation
<br />6057 feet prior to the spring runoff, with
<br />1,309,000 acre-feet In storage. MinImum
<br />average dally releases during this period were
<br />810c!s.
<br />
<br />With an April through July runoff of 899,000
<br />acre-feet, 128 percent of normal, the reservoir
<br />water surface reached a maximum elevation of
<br />6064 feet In early July. At this elevation,
<br />approximately 1 foot from full capacity, the
<br />reservoir stored 1,679,000 acre-feet. The
<br />water surface elevation was then gradually
<br />raduced to alevatlon 6060 feet by the end of
<br />the water year.
<br />
<br />The maximum average dally Inflow to Navajo
<br />Reservoir of 8,390 cts occurred on June 1,
<br />1963. Maximum dally outflow Irom the
<br />reservoir was 2,810 ets. This reduction In flow
<br />reduced flood damage not only on the San
<br />Juan River but alsO on the lower reaches ot the
<br />Colorado River. A total of 1 ,141,000 acre-feet
<br />was released to the San Juan River, and
<br />130,000 ac:-e-fest were furnished to the Navajo
<br />Indian Irrigation Project.
<br />
<br />2
<br />
<br />
<br />(;~t~;ti~~;ili~&~}~~
<br />
<br />Weter Veer 11184
<br />On September 30, 1983, Navajo Reservoir
<br />stored 1,611,900 acre-feet of water at an
<br />elevatIon of 6080 feet. Assuming average
<br />Inflow for water year 1984, the prolected
<br />elevation before snowmelt runoff begins Is
<br />6059 feet with a content of 1 ,329,000 acre-feet.
<br />By the end of June 1884, the reservoir Is
<br />expected to reach an elevation of 6081 feet
<br />with a content of 1,641,000 acre-feet. This
<br />approximate elevation wltl be maintained
<br />throughout the summer to enhance
<br />recreational use.
<br />
<br />Releases trom Navajo Reservoir for an
<br />upper quartile Inflow are projected to average
<br />1,200 cfs through the fall and winter and
<br />Increase to a maximum of 2,000 cfs during the
<br />summer. With an upper decile Inflow, outflow
<br />from the reservoir Is expected to peak at 3,200
<br />ets. For an 8versgelnflow, reless8s are
<br />expected to average about 1,250 cfa
<br />throughout the year. The projected lower
<br />Quartile and most adverse releases are
<br />projected to averege about 900 cfs and 700 cfa,
<br />respectively, throughout the water year.
<br />
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<br />
<br />Navajo Active Storage.
<br />Reservoir (Acre-Feet)
<br />
<br />Chart 4
<br />
<br />EI.
<br />(Ft.)
<br />
<br />Maximum Storage
<br />Inactive Storage
<br />Surface Area (Full)
<br />Reservoir Length
<br />(Full)
<br />
<br />1,696,400
<br />660,500
<br />15,610 Acres
<br />
<br />6085
<br />5990
<br />
<br />33 Miles
<br />
<br />"does not Incrude 12,600 acre-teet of dead storage
<br />beJow5775 feet
<br />
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