Laserfiche WebLink
<br />---.... <br /> <br />01) 1 '/93 <br /> <br />l~m5?\?J1m <br />FES 141984 '~ <br />CJf,,~~~~~~9..~~Tr;~ <br />t..\ '~J'",: ~."'\ <br />COLOP~O RIVEE above CISCO, GTPB: The water supply outlook for the Colorado Basin <br />remains much a~ove normal. The dr;, cold weather during January caused streamflow <br />forecasts to drop dramatical:y o,er most of the basin with decreases of 15 to 25% <br />,common. Most forecasts contin'~2 to be between l40 to 130% of normal. The lower <br />forecast vol~~es have eased the tlrreat of spring snowmelt flooding but the potential <br />is still sufficiently high enough to threaten many low lying areas. <br /> <br />WATER SUPPLY OUTLOOK FOR UPPER COLORADO BA' <br /> <br /> <br />as of FebruarJ l, 1984 <br /> <br />Precipication durir~ January was generally confined to one storm at mid-month which <br />produced only 30 to 50% of the normal January aff,ount. The upper Gunnison basin <br />received the least amoUIlt r'!.nging from 19% of ave::'age at Lake City to 33% of average <br />~t Gurulison and Sarge~ts. Seasonal precipitation, October chrough January, was <br />~enerally l40 to 180% over most of the basin. <br /> <br />Snowfall was much below normal during January, and the snow surveys conducted by <br />the Soil Conservation Service on February l, indicated a significant reduction in <br />the average basi~ snow w~ter conte~t in relation to nor~l. On January 1 the upper <br />Gunnison was 229% of average but by February 1 had dropped to 160% of normal, <br />Other basin averages include: Upper Colorado - l60%, Roaring Fork dr'!.inage - 152% <br />and Dolores basin - 149%. Although the snowpack is not as much abov~ normal as it <br />was on January 1, still 24 of the 130 courses ~ead on Feorua~ 1 se~ or equ~lled <br />~he ~axi~~~ of record. <br /> <br />Runoff Juring January concinued to be above normal wich the flow on the Cclor~jo <br />River at Cisco, Utah - 238,000 acre-feet,l62% of average, Since October 1, the f:ow <br />~~ Cisco, Utah has been 1.~9 ~~licn acre-feet, 147~ of average. <br /> <br />~eservQir storage on J~~~nuary 31: 1984 in the four ~ajor reservoir3 above Cisco, <br />Utah (Granby, Dillon, Green Mountain and Blue Mesa) is l,23 ~illion acre-feet, 73% <br />of c~pacity, 132% of average and about 210,000 acre-feet lower ttan ~ ~Gnth ago, <br />Storage in Lake Powell is 22,0 million acre-feet 700,000 acre-feet lower than last <br />yea~ 2t this tiv.:.e and 38~b of ce.paci r,y. The April-Jul;y inflow forec=.st tc Lake <br />?owell is ~2,4 ~Qllion acre-feet, 166% of the 20-year (1961-1980) average. <br /> <br />GREE::N P..lij~~. BA5I~,r: ,J~.n1.!ary was 2. 'fer?, d.r~r L:lonth.. I}Ji th precipi tal.ion 2.I1l0ur.ts <br />averaging leS3 than 50 percent across the basil" This dry period is reflected in <br />the reduced water supply forecasts (dropped 10 to 20%) of February 1. Forecasts <br />now range 95 to 140% above Flaming Gorge Eeservoir and liD to 250% below the dam, <br /> <br />January precipitation was generally well below nor"lal (less than 50%) throughout <br />t~e e~tire basi~. Seasonally, October th~ough JcnuarYJ accumulations still <br />remain well eocve normal, greater than 150% above Flaming Gorge a~d 120 to i50% <br />below, <br /> <br />NOAA - NATIONAL V~THE.q SERVICE <br />Goloradc Basin River Forecast Cente~, Salt Lake City, Utah <br />Gerald Willia"ls, nydr010gist in Charge <br />