WSP12299

• File Number: 8282.600.10
• Description: Colorado River Annual Operating Reports
• Basin: Colorado Mainstem
• Date: 1/1/1975
• Author: USDOI/BOR
• Title: Operation of the Colorado River Basin 1975 Projected Operations 1976
• Water Supply Pro - Doc Type: Publication

35

Navajo De..ervoir

On September 30,1975, Navajo
Reser....oir had an acth'e storage
of 1,390,000 acre-feet with water
surface elevation at 6,064 feet.
During October through March,
releases will be controlled to lower
the reservoir elevation to 6,030
feet prior to spring runoff. At
elevation 6,030 feet, Navajo Reser-
voir will have an extra 50,000
acre.feet of storage in anticipation
of the initial water release for the
Navaio Indian irrigation projf':ct.
Average inflow would cause the
reservoir to reach elevation 6~059
feet, with an active storage of
1,330,000 acre-feet. The reservoir
wm be maintained at or near thh
level throughout the remainder of
the summer to enhance recrea-
tional Use, (Cbart 5.)

Glen Canyon-Lake Powell

For the current year, the level of
Lnke Powell should drop about
4 feet during the fall and winter
months to elevation 3,663 feet. The
active storage would be 19,5 mil.
lion acre.feet. Assuming an aver-
age April.July 1976 runoff, the
resulting inflow of about 8.0 mil.
lion acre-feet should cause the
lake to reach an all.time high
elevation of 3,681 feel during July,
with an active s.torage of 22.1
million acre.feet, or approximately
88 percent of the active capacity
of the reservoir. The lake would
have a length of 185 miles and a
water surface area of 148,150
acres. Assuming average condi.
tions during water year 1976, a
total release of 9.7 million acre.feet
is scheduled from Lake Powell to
satisfy storage requirements for
Lake Mead and Lake Powell, in
compliance with section 602 of

Public Law 90.537, The scbeduled
release will pass through the tur-
bines to generate power for cus-
tomers in the Colorado River
Basin States, (Cbart 6,)