WSP13019 ‎(2)‎

• File Number: 8040.800
• Description: Colorado Water Resources
• State: CO
• Basin: Statewide
• Date: 7/1/1999
• Author: Division of Water Resources
• Title: Colorado Water Supply Conditions Update Reports
• Water Supply Pro - Doc Type: Data

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SOUTH PLATTE BASIN

Dec"()1

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Basinwide Conditions Assessment
The SWSI value of -2.4 indicates that for November
the basin water supplies were below normal. Reservoir
storage. the major component in this basin in computing the
SWSf value, was 83% of normal as of the end of November.
Cumulative storage in the major plains reservoirs: Julesberg,
North Sterling, and Prewitt, is at 47% of capacity.
Cumulative storage in the major upper-basin reservoirs:
Cheesman, Eleven Mile, Spinney, and Antero is at 82% of
capacity. The Natural Resources Conservation Service
reports that December 1 snowpack is 52% of normal. Flow
at the gaging station South Platte River near Kersey was
728 efs, as compared to the long-term average of 950 cfs.
Flow at the Colorado/Nebraska state line averaged 210 cfs.

Outlook'
Even though overall reservoir storage is less than
average and conditions have generally been dry the last
month, there is not a large concern about titling reservoirs at
this time. One concern is the low levels of reservoirs
associated witb the Colorado Big Thompson project, a major
source of supplemental supply for the South Platte Basin.
Unlike each year in the past eight years, the storage in this
transbasin system is far below average for this time of year.
While it is unlikely that low storage conditions would effect
the quota from this project this coming year, a long term dry
period potentially could impact supplies from this project.

Administrative/Manaaement Concerns
Reservoir storage continued in November for the
plains reservoirs on the South Platte. tn addition to storage,
there was continued recharge on the plains. Unlike . last
year, there was no call .for storage on the mainstem
downstream of Denver as the new water year began in
November. The Barr lake call was placed for diversions
through the Burlington ditch north of Denver, which is typical
for this time of year.

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