Colorado State Basin Outlook Report

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State Basin Outlook Reports WILLIAMS FORK BASIN 2 85 95 WILLOW CREEK BASIN 2 98 122 TOTAL COLORADO RIVER BASIN 28 103 105 ? SOUTH PLATTE RIVER BASIN as of January 1, 2008 Water Year 2008 started out close to average in the South Platte River Basin, took a turn for the worse, and then rebounded nicely. According to data from 17 Snotel sites, precipitation in October was near normal at 109% of average. November, like in most basins, was very dry and only saw 36% of the average precipitation for that month. Snowy weather finally arrived in early December, took a little break during the middle of the month, and then returned again before the New Year. The wetter than average December has made the water picture a little brighter, as it saw 146% of its average precipitation and brought the year to date precipitation up to 96% for January 1 on the South Platte. Snow levels are slightly less than average, 93$ of average to be exact. Based on data from six Snotel sites in the Upper South Platte, the snowpack is at 95% of its average in that sub-basin. Other sub-basins containing two or three Snotel sites have snowpacks ranging from 79 to 110 percent of average. Based on data from 33 reservoirs, reservoir storage in the South Platte River Basin is at 89% of average but 115% of storage at this time last year. Expect April through September streamflow volume in the South Platte Basin to vary from 77% of average on the St. Vrain and Big Thompson to 91% of average on the South Platte at the inlet to Cheesman Lake. -------------------------------------- -------------------------------------- SOUTH PLATTE RIVER BASIN Streamflow Forecasts - January 1, 2008 Drier =_= Future Conditions =_= Wetter Forecast Pt Chance of Exceeding Forecast 1 90% 70% ( 50% 1 30% 10% 1 30 Yr Avg Period 1(1000AF) (1000AF)I(1000AF) (% AVG.)1(1000AF) (1000AF)I (1000AF) ANTERO RESERVOIR Inflow (2) APR-JUL 7.1 10.8 14.3 85 19.0 29 16.8 APR-SEP 8.6 13.2 17.7 81 24 36 22 SPINNEY MOUNTAIN RESV Inflow (2) APR-JUL 25 37 48 86 63 93 56 APR-SEP 30 46 61 88 82 125 69 ELEVENMILE CANYON RESV Inflow (2) APR-JUL 24 37 49 85 65 99 58 APR-SEP 28 45 62 86 85 136 72 CHEESMAN LAKE Inflow (2) APR-JUI, 52 78 102 90 134 200 114 APR-SEP 64 96 128 91 170 260 140 SOUTH PLATTE R at South Platte (2) APR-JUL SS 136 183 89 245 380 205 APR-SEP 110 171 230 90 310 480 255 BEAR CREEK abv Evergreen APR-JUL 7.2 11.8 16.4 85 23 37 19.3 APR-SEP 9.8 15.4 21 84 29 45 25 BEAR CREEK at Morrison APR-JUL 7.9 14.2 21 84 31 56 25 APR-SEP 10.4 17.9 26 84 38 65 31 CLEAR CREEK at Golden APR-JUL 60 80 94 86 108 128 110 Page 6 of 15 http://www.wcc.nres.usda.gov/cgibin/bor2.p1?state=co&year=2008&month=l&format=text 4/14/2008