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<br />SAN JUAN/DOLORES BASIN
<br />
<br />Jun.01
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<br />
<br />Basinwide Conditions Assessment
<br />The SWSI value of 2,8 indicates that for May the
<br />. basin water supplies were above normal. The Natural
<br />Resources Conservation Service reports that June 1
<br />snowpack is 32% of normal. Flow at the gaging station
<br />Animas River near Durango was 3,144 cfs, as compared to
<br />the long-term average of 2,198 cfs, Storage in McPhee,
<br />Vailecito, and Lemon reservoirs totaled 105% of normal as
<br />of the end of May,
<br />Significant melting of the snowpack in the San Juan
<br />drainage occurred during the month, Stream flows ran weil
<br />above average on most drainages, Even the Dolores with
<br />predictions of 80% of nor,mal ran 104% during the month of
<br />May, Temperatures were very warm, In Durango, both the
<br />lows and the highs were 50 higher than normal.
<br />The precipitation Was slightly below normal but most
<br />of it occurred in the first week, After that only a few days
<br />recorded measurable rain, Warm winds dried the ground
<br />out quickly, Plants grew quickly and alfalfa matured early,
<br />This is one of the earliest years in memory for the first spring
<br />hay cutting to have occurred, Most of the rivers peaked at
<br />midmonth, The Animas exceeded 5,300 cfs on May 16'h but
<br />the average that day was computed at 4,760 cfs, using
<br />preliminary data, The Dolores River reached a high at
<br />around 3,300 cfs into McPhee Reservoir,
<br />
<br />Outlook
<br />Reservoirs including Lemon Reservoir captured
<br />much of the excess flows, Lemon had nearly filled by the
<br />end of the month and 'even McPhee was above normal
<br />storage levels, There was still snow in the mountains but it
<br />appeared uniikely that earlier flow stages would be
<br />exceeded in June,
<br />
<br />Administrative/Manaoement Concerns
<br />Additional precipitation was greatly needed but in
<br />general the amount available for agriculture appeared
<br />adequate up to this point in time, The ground water
<br />carryover provided the early supplies,
<br />
<br />Pubiic Use Imoacts
<br />Unfortunately for rafters on the Dolores River, water
<br />was not available for spill releases this year but recreation
<br />flows on other rivers were readily available for at least a
<br />short time this year.
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<br />ANIMAS RIVER NR. ~, FlO(V BY WAl'ER YEAR
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<br />1,0lXl,OOO
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<br />900,000
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<br />700,000
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<br />600,000
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<br />""',000
<br />
<br />400,000
<br />
<br />300,000
<br />
<br />200,000
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<br />100,000
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<br />Oct N::>v Dee .Ian
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<br />Feb M:udl ..Apil tv'ey JlIle JIAy. 1>l!9.. Sepl.
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<br />-+-1;yET(1973)
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<br />___!::RY(1977) ,-:*-AVG -)E--2QJ1
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<br />
<br />REPRESENTATIVE RESERVOIRS
<br />
<br />400,000
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<br />350,000
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<br />_ 300,000
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<br />~ 250,000
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<br />W200,OOO
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<br />~ 150,000
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<br />
<br />100,000
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<br />50,000
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<br />IIA'-'d.05l31 Contents
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<br />Lomoo
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<br />/'.iI05I31/01Contents
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