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~==~._~~.~.~=.~==~...~...==..c..~~=...._...-~.~..~........===z.~z=....a.~==......==...=~==~....~~~z~..a.~=~.a.....a.a...~~~._~Z_~a. SOtrrH PLATTE RIVER BASIN Streamflow Forecasts . May 1, 2001 a.~..~~~...a~~.~....~..~=.__.~_.==~.z~=~._a.===.a~===z..a=~~=aa._~_..a.a==.==a.z=~~~.....z~..===~..~a...=~=~....z.aa.......a=..~a~ I <<~~~_.. Drier z._... Future Conditions Wetter .a_~c>> I I 1 Porecast point Forecast I ..~==a.~......__=~.. Chance Of Exceeding ..a====_................z I Period I 90\ 70\ 50\ (Most Probable) I 30% 10\ I 30-Yr Avg. \ (lOOOAP) (lOOCAP) I (lOOOAF) (\ AVO.) \ (IOOOAP) (IOOOAP) I (lOOOAP) .==.=.=...==..==..===..=.=..===..=.............=.............==...==I........=......==....==i=...==.==.....=.=.....====...===..... Antero Reservoir inflow APR-JUL 4.0 5.9 I 7.7 66 I 10.0 14.7 11. 7 I 1 spinney Mountain Reservoir inflow APR-JUL 18.9 25 I 30 79 I 36 48 38 1 1 Elevenmile Canyon Reservoir inflow APR-JUL 18.1 25 I 30 79 I 35 42 38 I 1 Cheesman Lake inflow APR-JUL 46 57 I 65 77 I 75 91 84 1 1 South Platte River at South Platte APR-SEP 96 137 I 165 78 I 193 234 213 I 1 Bear Creek at Morrison APR-SEP 17.7 23 I 26 87 I 29 14 30 1 1 Clear Creek at Golden APR-SEP 88 102 I 111 87 I 120 134 128 I 1 St. Vrain Creek at Lyons APR.SEP 41 53 I 61 78 I 69 81 78 1 1 Boulder Creek nr Orodell APR-SEP 35 40 I H 83 I 46 51 52 I I South Boulder Creek nr Eldorado spri APR-SEP 23 33 I 40 89 I 47 57 45 1 1 Big Thompson River at mouth nr Drake APR-SBP 64 77 I 86 75 I 95 108 114 I I Cache La Poudre at Canyon Mouth APR-Sii:P 125 164 I 190 70 I 228 283 272 1 1 .~.~~..~====...=.~..._.~.__..._~.___~==~......~=.~..a.=~~..~~~=....========a...~===..~~=._.a..=~.._...~=c==......~=~~...a~===z.a~== I I ~._.a===...=~===.._...z._._...~=~a...E=~.._...~=~~.a..~~=z~a==~~~...~=====~...a.~=.~~a.~=~c..a..~_=......_~===..a..===~......=~.~=....=a Usable I ... Usable Storage ... I Number This Year as \ of capacityl This Last I Watershed of ...a_a~",~....aa.." I Year Year Avg I Data Sites Last Yr Average =.=............=..=........=.................=.....==................=..1....===....===................=........==................ ANTERO 20.0 20.0 20.0 14.7 I BIG THOKPSON BASIN 6 86 72 BARR LAKE 32.0 29.2 28.9 27.3 I BOULDER CREEK BASIN 4 104 63 BLACK HOLLOW 8.0 2.4 4.0 4.3 \ CACHE LA POUDRE BASIN 8 85 75 BOYD LAKE 49.0 22.3 41.9 36.7 I CLEAR CREElC BASIN 4 99 98 CACHE LA POUDRE 10.0 8.4 10.0 8.7 I SAINT VRAIN BASIN 3 88 46 CARTER 108.9 102.2 100.8 102.3 I UPPER SOUTH PLATTE BASIN 16 97 95 CHAMBERS LAKE 9.0 3.5 5.5 ).7 I TOTAL S01.TI'H PLATTE BASIN 39 92 80 CHEESMAN 79.0 59.2 71.4 60.6 I COBB LAKE 14.0 9.0 17.5 14.1 I ELEVKN MILE 97.8 100.1 101.2 92.0 I EMPIRE 38.0 34.2 33.4 32.8 I FOSSIL CREEK 12.0 9.9 6.5 8.1 I GROSS 41.8 14.9 27.6 21.5 HALLlQAN' 6.4 3.0 5.5 5.3 HORSECRSEK 16.0 14.8 14.5 14.7 HORSETOOTH 149.7 38.5 102.6 120.5 JACKSON 35.0 26.0 23.6 33.1 JULESBURO 28.0 18.4 17.1 22.6 LAKE LOVKLAND 14.0 11.6 12.0 10.1 LONE TREE 9.0 8.8 8.8 7.6 KARIANO 6.0 5.3 5.6 5.1 MARSHALL 10.0 7.7 9.6 6.3 MARSTON 13.0 10.9 7.8 8.5 MILTON 24.0 21.0 20.3 17.2 POINI' OF ROCKS 70.0 70.6 65.6 68.6 PREWITT 3J. 0 24.6 22.6 24.4 RIVERSIDE 63.1 56.0 52.6 58.1 SPINNEY MOUNTAIN 48.7 20.9 3J. 6 3J. 9 STANDLEY 42.0 31.2 41.2 29.1 TERRY LAKE 8.0 5.6 6.5 5.7 UNION 13.0 11.7 12.1 11.1 WINDSOR 19.0 11.0 15.0 12.7 SOUTH PLATTE RIVER BASIN Reservoir Storage (1000 AF) - End of April S01J'l'H PLATTE RIVER BASIN Watershed Snowpack Analysis . May 1. 2001 Reservoir ...====.=a..a........~=======~=2.a_......~z=====~.a.~==.....=~=.~....aa....===~..a.~===~_.~=====a.==z~.a.a..==~=~..~==========..~==2 . 90\, 70\, 30\, and 10\ chancee of exceeding are the probabilities that the actual volume will exceed the volumes in the table. The average is computed for the 1961-1990 base period. (1) - The values listed under the 10\ and 90\ Chance of Exceeding are actually 5\ and 95\ exceedance levels. (2) - The value is natural volume _ actual volume may be affected by upstream water management.