WSP12944

• File Number: 8040.800
• Description: Water Resources for Colorado
• State: CO
• Date: 3/1/2003
• Author: US Dept of Agriculture - Natural Resoruces Conservation Service
• Title: Colorado Basin Outlook Report March 1, 2003
• Water Supply Pro - Doc Type: Data

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SOUTH PLATTE RIVER BASIN
Streamflow Forecasts - March 1, 2003

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Wetter =====>> I
I
==============:===== Chance Of Exceeding * ====================== 1
90% 70% 50% (Most Probable) 30% 10% I 30-Yr Avg.
I (1000AF) (1000AF) I (1000AF) (% AVG.) I (1000AF) (1000AF) I (1000AF)
a=~====._===================~==================_====================1=======================1================a=================~==
Antero Reservoir inflow APR-JUL 2.4 3.5 I 4.5 35 I 5.8 8.3 13 .0
Spinney Mountain Reservoir inflow APR-JUL 15.2 20 I 25 63 I 31 41 40
Elevenmile Canyon Reservoir inflow APR-JUL 9.9 18.3 I 24 59 I 30 38 41
Cheesman Lake inflow APR-JUL 38 47 I 55 62 I 64 80 89
South Platte River at South Platte APR-SEP 75 122 I 155 67 I 188 233 230
Bear Creek at Morrison APR-SEP 10.5 17.3 I 22 71 I 27 34 31
Clear Creek at Golden APR-SEP 48 73 I 90 67 I 107 132 134
St. Vrain Creek at Lyons APR-SEP 33 48 I 58 69 I 68 83 84
Boulder Creek rir Orodel,l APR-SEP 25 34 I 40 76 I 46 55 53
South Boulder Creek nr Eldorado Spri APR-SEP 13.0 25 I 34 74 I 43 55 46
Big Thompson River at mouth nr Drake APR-SEP 57 74 I 85 73 I 96 113 117
Cache La poudre at Canyon Mouth APR-SEP 106 159 I 195 71 I 230 285 275
I I

<<====== Drier =====e

Future Conditions

Forecast Point

Forecast
Period

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I
I
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*** I
I
Avg I

SOuTH PLATTE RIVER BASIN
Reservoir Storage (1000 AF) - End of February

SOuTH PLATTE RIVER BASIN
Watershed Snowpack Analysis - March 1, 2003

Reservoir

Usable I
Capacity I
I

*** Usable Storage
This Last
Year Year

Watershed

Number
of
Data Sites

This Year as % of

Last Yr

Average

=== ::::11'=.== == e= = =::::11 = = = = = = = === == == = == = ==:a = = == == = = == = = == = = == == = = == = == == == ='= = == = = = ==::::11 = = = == == = = == = = = == == = === = == == = = == = = = II: ==== == == == ==== = = = =

ANTERO 20.0 0.0 20.0 16.3 BIG THOMPSON BASIN 6 143 81
BARR LAKE 32.0 13.8 25.0 26.0 BOULDER CREEK BASIN 5 165 82
BLACK HOLLOW 8.0 2.1 2.8 3.9 CACHE LA POUDRE BASIN 8 132 80
BOYD LAKE 49.0 6.0 20.4 32.4 CLEAR CREEK BASIN 4 158 96
CACHE LA POtJDRE 10.0 2.6 3.6 7.8 SAINT VRAIN BASIN 4 133 70
CARTER 108.9 101.2 93.5 93.4 UPPER SOUTH PLATTE BASIN 15 173 74
CHAMBERS LAKE 9.0 2.0 3.8 3.1 TOTAL SOUTH PLATTE BASIN 41 151 79
CHEESMAN 79.0 46.2 58.0 59.0
COBB LAKE 34.0 2.5 6.8 13.9
ELEVEN MILE 97.8 44.5 99.4 95.8
EMPIRE 38.0 24.0 30.1 25.6
FOSSIL CREEK 12.0 6.0 8.6 7.4
GROSS 41.8 15.9 22.9 25.3
HALLIGAN 6.4 2.8 4.7 4.8
. HORSECREEK 16.0 1.1 12.5 12.5
HORSETOOTH 149.7 20.4 19.3 109.2
JACKSON 35.0 23.5 20.5 27.3
JULESBURG 28.0 16.9 14.6 18.9
LAKE LOVELAND 14.0 8.1 10.2 8.8
LONE TREE 9.0 6.6 8.4 6.7
MARIANO 6.0 0.5 2.3 4.3
MARSHALL 10.0 3.5 4.8 5.4
MARSTON 13.0 13.4 9.0 12.9
MILTON 24.0 3.0 19.3 17.1
POINT OF ROCKS 70.0 25.0 52.8 65.4
PREWITT 33.0 5.1 20.2 21.0
RIVERSIDE 63.1 30.6 47.1 48.9
SPINNEY MOuNTAIN 48.7 13.2 22.1 32.2
STANDLEY 42.0 20.7 32.1 33.6
TERRY LAKE 8.0 1.4 5.1 5.3
UNION 13 .0 6.0 9.5 11.0
WINDSOR 19.0 0.4 5.5 11.5

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* 90%, 70%, 30%, and 10% chances of exceeding are the probabilities that the actual volume will exceed the volumes in the table.
The average is computed for the 1971-2000 base period.
(I) - 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.