WSP00886

• File Number: 8407
• Description: Platte River Basin - River Basin General Publications
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 4/16/1990
• Author: BOR
• Title: Annual Operating Plans - North Platte Project Water Years 1989-1990
• Water Supply Pro - Doc Type: Report/Study

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totaled only 17,666 acre-feet for the year. This was only 43 percent of
the average 41,500 acre-feet annually diverted.

August precipitation and inflow at Lake Estes were near normal at
91 percent of average and 93 percent of average, respectively. Total
precipitation for the water year (October-September) was 14.95 inches or
87 percent of average. The inflow above Lake Estes was 62,400 acre-feet
for water year 1989 and this was only 69 percent of average.

Estes Powerplant generation totaled 122,200,000 kilowatt-hours for the
water year and was nearly 15,500,000 kilowatt-hours above average.
This was due to the above-average Adams Tunnel diversions which were
118 percent of average.

Carter Lake

Completed in 1952 with three dams, Carter Lake has a total storage
capacity of 112,200 acre-feet. Inflow of project water to Carter Lake
is from the Flatiron Pumping Plant with a capacity of about 400 ft3/s.

Carter Lake storage content at the beginning of the water year was
84,295 acre-feet which was above the 30-year average of 50,800 acre-feet.
Project water deliveries to the St. Vrain Canal continued through the
end of October, and totaled 6,823 acre-feet for the month.

Continuous pumping to Carter Lake from Flatiron Reservoir continued
until late October to accommodate scheduled Charles Hansen Feeder
Canal(550 ft3/s section) maintenance during the October 1 to October 14
period. Pumping to Carter Lake was shut down on October 25 due to the
high deliveries (500 ft3/s) to the Big Thompson River. Pumping
continued on November 2, and this brought Carter Lake storage to the
maximum for the water year of 112,321 acre-feet on December 21. This
was 0.08 feet above the normal maximum operating level of 5759.00 feet.

An early fi 11 of Carter Lake by the end of December 1988
allow for scheduled maintenance on the pressure tunnel.
tunne 1 was shut down from December 21, 1988, to June
pressure tunnel lining repair, 9routing, and Flatiron
maintenance.

was planned to
The pressure
15, 1989, for
Unit 3 annual

Irrigation deliveries to the St. Vrain Canal began in early April. A
total of 3,605 acre-feet was delivered in April and 16,521 acre-feet in
May, including metered delivery. Water deliveries for June were much
above normal at 9,700 acre-feet. Pumping to Carter Lake began again on
June 15 and was scheduled as necessary to maintain the lake at a
desirable operating level.

Project water del iveries were much above average in July at
33,000 acre-feet, which was 202 percent of average. The end of water
year storage of 36,450 acre-feet was 14,350 acre-feet below normal.

Water year deliveries to the St. Vrain Canal totaled 100,400 acre-feet,
much above the 30-year average of 61,000 acre-feet.

Flatiron Unit 3 generation was not scheduled during the water year due
to high Project deliveries. A total of only 33 acre-feet was delivered

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