WSP12945

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

SOUTH PLATTE RIVER BASIN
Streamflow Forecasts - January I, 2003

=====================================================================_==u=========================================================

I <<====== Drier ====== Future Conditions Wetter =====>>
I
Forecast Point Forecast I ==================== Chance Of Exceeding * ======================
Period I 90t 70t sot (Most Probable) 30t lot 30-Yr Avg.
I (1000AF) (1000AF) I (1000AF) (t AVG.) I (1000AF) (1000AF) I (1000AF)
=====__==m=========================~====.==_================_==~=_==I================_======I=========c=============:===========-=
Antero Reservoir inflow APR-JUL 2.1 3.9 I 5.8 45 I 8,7 15.9 13.0
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Spinney Mountain Reservoir inflow APR-JUL 12.9 19.9 I 27 67 I 36 55 40
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Elevenmile Canyon Reservoir inflow APR-JUL 0.9 14.4 I 24 58 I 33 46 41
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Cheesman Lake inflow APR-JUL 29 43 I 57 64 I 75 113 89
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South Platte River at South Platte APR-SEP 14.0 97 I 153 67 I 209 292 230
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Bear Creek at Morrison APR-SEP 6.3 13.9 I 19.0 61 24 32 31
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Clear Creek at Golden APR-SEP 51 74 I 90 67 106 129 134
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St. Vrain Creek at Lyons APR-SEP 38 51 I 60 71 69 83 84
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Boulder Creek nr Orodell APR-SEP 22 31 I 37 70 43 52 53
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South Boulder Creek nr j;:Jg.Q);g99 Spri APR-SEP 8.7 23 I 32 70 41 55 46
1-
Big Thompson River at mouth nr Drake APR-SEP 57 73 1 83 71 93 109 117
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Cache La Poudre at Canyon Mouth APR-SEP 57 136 I 190 69 268 383 275
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Usable I *** Usable Storage *** I Number This Year as t of
Capacity I This Last I Watershed of =================
I Year Year Avg I Data Sites Last Yr Average
===================~===========================_====_=======s=========_=I======_====_===========================:=================
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SOUTH PLATTE RIVER BASIN
Reservoir Storage (1000 AF) - End of December

Reservoir

ANTERO
BARR LAKE
..BLACK HOLLOW
BOYD LAKE
CACHE LA POUDRE
CARTER
CHAMBERS LAKE
CHEESMAN
COBB LAKE
ELEVEN MILE
EMPIRE
FOSSIL CREEK
GROSS
HALLIGAN
HORSECREEK
HORSETOOTH
JACKSON
JULESBURG
LAKE LOVELAND
LONE TREE
MARIANO
MARSHALL
MARSTON
MILTON
POINT OF ROCKS
PREWITT
RIVERSIDE
SPINNEY MOUNTAIN
STANDLEY
TERRY LAKE
UNION
WINDSOR

20.0
32.0
8.0
49.0
10.0
108.9
9.0
79.0
34.0
97,8
38.0.
12,0
41.8
6,4
16.0
149.7
35.0
28.0
14.0
9.0
6.0
10.0
13.0
24.0
70.0
33.0
63.1
48.7
42.0
8,0
13.0
19.0

0.0
12,2
2,1
6.1
1.0
71.3
3.2
51.5
2.5
44,6
7.9
2.9
17.2
2.5
1.1
9.8
24.8
15.7
7.6
5.1
0.5
2.9
4.9
2.4
13.7
0,0
8.4
17.0
20.7
1.4
5,7
0,4

20.0
17,1
2.8'
20.4
0.7
60.0
3.8
58.5
6.8
99.5
21.0
6.2
29.2
3.3
11.8
9.2
0,0
15.3
10.3
8.2
0.7
4.6
8.6
17.3
38.9
11.3
41.2
23.0
32.1
5.1
9.2
5.3

16.5
22.4
3.8
31.7
6.3
74.7
2,8
60.9
13.9
95.9
22.2
6.3
26.2
3.6
10.9
87,8
23.0
18.4
8.9
6.0
4.1
4.7
12.7
14.8
51.1
18.0
38.1
35.4
32.5
5,2
10.4
10.0

SOUTH PLATTE RIVER BASIN
Watershed Snowpack Analysis - January 1, 2003

BIG THOMPSON BASIN
BOULDER CREEK BASIN
CACHE LA POUD~E BASIN
CLEAR CREEK BASIN
SAINT VRAIN BASIN
UPPER SOUTH PLATTE BASIN
TOTAL SOUTH PLATTE BASIN

146
170
105
120
116
157
137

86
80
70
85
116
59
73

3
3
2
2
1
5
15

==========================================================a=__=====_.===========_=====================================~===========

* 90t, 70t, 30t, and lot 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.

(1) - The values listed under the lot and 90t Chance of Exceeding are actually 5t and 95t exceedance levels.
(2) - The value is natural volume - actual volume may be affected by upstream water management.