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___._______.....a.._.._.a._...................................................................................................'.... SOUTH PLATTE RIVER BASIN Streamflow Forecasts - January 1, 2004 .-..........................-..................................................................................................... I <<...... Drier ...... Future Conditions I Forecast I .................... Chance Of Exceeding * ...................... Period I 90% 70% 50% (Most Probable) 30% 10% 30-Yr Avg. I (1000AP) (1000AF) I (1000AF) (% AVG.) I (1000AF) (1000AP) I (1000AF) ....................................................................l.......................,..................................... Antero Reservoir inflow APR-JUL 2.3 4.4 I 6.5 37 I 9.6 17.7 17.5 I I I 31 54 I I I I I I I I I I I I I I I I I I I I I I Forecast Point Spinney Mountain Reservoir inflow 14.8 23 APR-JUL Elevenmile Canyon Reservoir inflow 0.6 20 APR-JUL Cheesman Lake inflow APR-JUL 33 48 South Platte River at South Platte 10.0 102 APR-SEP Bear Creek at Morrison APR-SEP 3.0 10.6 Clear Creek at Golden APR-SEP 69 92 St. Vrain Creek at Lyons APR-SEP 38 51 Boulder Creek nr Orodell APR-SEP 35 43 South Boulder nr Eldorado Spgs APR-SEP 17.7 32 _Big Thompson River at mouth nr Drake APR-SEP 69 85 CACHE LaPOUDRE at Canyon Mouth APR-SEP 145 196 --...........................................-.................................................................................... 265 315 275 SOUTH PLATTE RIVER BASIN Reservoir Storage (1000 AF) - End of December Reservoir Usable I Capacity I 33 56 Wetter .....>> 40 62 57 65 57 47 67 59 163 64 86 127 114 15.7 51 225 310 254 108 81 21 28 31 60 71 124 147 134 49 93 69 82 84 41 90 55 63 53 95 81 50 64 46 230 84 105 121 117 SOUTH PLATTB RIVER BASIN Watershed Snowpack Analysis - January 1. 2004 Watershed Number of This Year as % of ................. .................................................................................................................................. I I .................................................................................................................................. *** Usable 'Storage *** I This Last I I Year Year Avg I Data Sites Last Yr Average ~;~..................................;~:~......~:~......~:~.....~;:;.I...;~~.;;~;;;~;.;~;~;..........;........;;........;;..... BARR LAKB 32.0 21.1 11.6 22.4 I BOULDER CREEK BASIN 3 74 59 BLACK HOLLOW 8.0 2.9 2.1 3.8 I CACHE LA POUDRE BASIN 2 102 72 BOYD LAKE 49.0 30.4 6.1 31.7 I CLEAR CREEK BASIN 2 106 90 CACHE LA POUDRE 10.0 0.8 1.0 6.3 I SAINT VRAIN BASIN 1 109 126 CARTER 108.9 36.1 71.3 74.7 I UPPER SOUTH PLATTE BASIN 6 69 46 CHAMBERS LAKE 9.0 6.4 3.2 2.8 I TOTAL SOUTH PLATTE BASIN 17 88 67 CHEESMAN 79.0 59.9 51.5 60.9 I COBB LAKE 34.0 5.2 2.5 13.9 I ELEVEN MILE 97.8 70.5 44.6 95.9 EMPIRE 38.0 10.2 7.9 22.2 I FOSSIL CREEK 12.0 2.4 2.9 6.3 GROSS 41.8 32.4 17.2 26.2 I HALLIGAN 6.4 2.5 2.5 3.6 I HORSECRBEK 16.0 3.3 1.1 10.9 I HORSETOOTH 149.7 86.7 9.8 87.8 JACKSON 35.0 23.7 24.8 23.0 I JULES BURG 28.0 15.3 15.7 18.4 I LAKE LOVELAND ~4.0 10.6 7.6 8.9 I LONE TREE 9.0 5.9 5.1 6.0 I MARIANO 6.0 1.0 0.5 4.1 I MARSHALL 10.0 5.7 2.9 .4.7 MARSTON 13.0 18.9 4.9 12.7 MILTON 24.0 5.5 2.4 14.8 I POINT OF ROCKS 70.0 24.5 13.7 51.1 I PREWITT 33.0 3.5 0.0 18.0 I RIVERSIDE 63.1 24.4 8.4 38.1 I SPINNEY MOUNTAIN 48.7 26.6 17.0 35.4 I STANDLEY 42.0 38.8 20.7 32.5 I TERRY LAKE 8.0 5.6 1.4 5.2 UNION 13.0 10.8 5.7 10.4 I WINDSOR 19.0 7.0 0.4 10.0 I The average is computed for, the 1971-2000 base period. * 90%, 70%, 30%, and 10% chances of exceeding are the probabilities that the actual volume will exceed the volumes in the table. (~) _ The values listed under the 10% and 90% Chance of Exceeding are actually 5% and 95% exceedance levels. (2) _ .Ths value is natural volume - actual volume may be affected by upstream water management.