WSP12946

• File Number: 8040.800
• Description: Water Resources for Colorado
• State: CO
• Date: 5/1/2005
• Author: US Dept of Agriculture - Natural Resoruces Conservation Service
• Title: Colorado Basin Outlook Report May 1, 2005
• Water Supply Pro - Doc Type: Data

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SOUTH PLATTE RIVER BASIN
Streamflow Forecasts - May 1. 2005

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<<=.==_~ Drier ===Q== Future Conditions Wetter -===->> ~
I

Forecast point F~~~~~~t ==;~;=======;~;====i Chance Of ~~~eeding . =I=-====;~;=-=====~~;=- I 30-Yr Avg.

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9.2 60 I 11.4 15.7 15,4
11.7 61 I 14.8 21 19.2
33 65 I 41 57 51
42 66 I 54 78 64
34 64 I 42 58 53
44 66 57 83 67
66 65 82 113 102
85 66 110 162 129
109 60 I 137 191 182
143 62 183 261 230
11.5 67 15.0 22 17.3
16.3 71 21 32 23
12.9 61 17.9 29 21
18.0 67 25 40 27
85 77 93 104 110
103 77 112 126 134
71 77 78 89 92
83 78 91 103 107
40 87 43 47 46
46 87 49 55 53
36 87 40 45 41
40 88 44 51 46
78 80 85 96 98
95 81 104 117 117
215 88 235 265 245
240 87 260 295 275

Antero Reservoir inflow MAY-JUL 5.4 7.4
MAY-SEP 6.6 9.3
spinney Mountain Reservoir inflow MAY-JUL 19.0 26
MAY-SEP 23 33
Elevenmile Canyon Reservoir inflow MAY-JUL 20 27
MAY-SEP 23 34
Cheesman Lake inflow MAY-JUL 38 53
MAY - SEP 45 65
South Platte River at South Platte MAY-JUL 62 87
MAY-SEP 78 112
Bear Creek abv Evergreen MAY-JUL 5.9 8.8
MAY-SEP 8.4 12.5
Bear Creek at Morrison MAY-JUL 5.8 9.3
MAY-SEP 8,1 13.0
Clear Creek at Golden APR-JUL 66 77
APR-SEP 80 94
St. Vrain Creek at Lyons APR-JUL 53 64
APR-SEP 63 75
Boulder Creek nr Orodell APR-JUL 33 37
APR-SEP 37 43
South Boulder nr Eldorado Spgs APR-JUL 27 32
APR-SEP 29 36
Big Thompson River at mouth nr Drake APR-JUL 60 71
APR-SEP 73 86
CACHE LaPOUDRE at Canyon Mouth APR-JUL 167 195
APR-SEP 185 220

SOUTH PLATTE RIVER BASIN
Reservoir Storage (1000 AF) - End of April

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SOUTH PLATTE RIVER BASIN
Watershed Snowpack Analysis - May 1, 2005

Reservoir

Usable I
Capacity

... Usable Storage
This Last
Year Year Avg

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Average

Watershed

Number
of
Data Sites

This Year as % of

Last Yr

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ANTERO 20.0 1.5 0.0 15.7 BIG THOMPSON BASIN 7 108 72
BARR LAKE 32.0 30.6 19.6 28.6 BOULDER CREEK BASIN 5 148 96
BLACK HOLLOW 8.0 1.7 2.7 4.2 CACHE LA POUDRE BASIN 8 129 73
BOYD LAKE 49.0 43.4 30.5 35.2 CLEAR CREEK BASIN 4 134 83
CACHE LA POUDRE 10.0 7.9 5,2 8,9 SAINT VRAIN BASIN 4 114 59
. CARTER 108.9 93.9 64.8 103.0 UPPER SOUTH PLATTE BASIN 15 106 80
CHAMBERS LAKE 9.0 5.1 5.8 3.6 TOTAL SOUTH PLATTE BASIN 43 120 77
CHEESMAN 79.0 78.7 63.6 64.8
COBB LAKE 34.0 3.5 5.2 14 .2
ELEVEN MILE 97.8 98.7 78.9 96,4
'EMPIRE 38.0 33.7 19.9 33.0
FOSSIL CREEK 12.0 10.3 6.7 ILl
GROSS 41.8 21.5 17.5 20.9
HALLIGAN 6.4 3.8 3.4 4.8
HORSECREEK 16.0 14.7 12.3 14.5
HORSETOOTH 149.7 123.7 148.9 123.0
JACKSON 35.0 25.7 23.7 30.4
JULESBURG 28.0 20.0 18.6 21.3
LAKE LOVELAND 14.0 8.9 10.6 10.1
LONE TREE 9,0 8.8 8.9 7.9
MARIANO 6.0 5.6 2.2 5.0
MARSHALL 10.0 9.7 8.0 7.4
MARSTON 13.0 11.6 4.8 14.5
MILTON 24.0 22.8 18.1 19.2
POINT OF ROCKS 70.0 66.0 56.1 69.8
PREWITT 28.2 23.6 8.5 25.9
RIVERSIDE 63.1 55.6 43.0 57,9
SPINNEY MOUNTAIN 48.7 19.9 17.3 32.1
STANDLEY 42.0 41.2 38.8 35.3
TERRY LAKE 8.0 5.5 5.7 5.7
UNION 13.0 12.6 9.8 11.7
WINDSOR 19.0 11.0 9.5 13.6

The average is computed for the 1971-2000 base period.

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. 90%, 70%, 50%, 30%, and 10% chances of exceeding are the probabilities that the actual volume will exceed the volumes in the table.

(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.