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

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Navajo Reservoir

Navajo Reservoir is operated
under a formal flood control plan.
On March 1, 1975, Navajo Reser.
voir had 935,000 acre.feet of water
in storage. The April.J uly inflow
forecast on March 1 was 660,000
acre-feet. Based on the March 1
forecast, the current flood control
diagram allowed the reservoir to
he full, and the scheduled opera.
tion of the reservoir did not in-
clude any releases specifically
required for flood control. (Chart
5.)

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Chart 5
STATISTICS
ACTIVE STORAGE-
RESERVOIR IACRE. ELEVATION
FEETl lHETl
MAXIMUM STOPAGE 1.696,400 6085
INACTIVE STORAGE 660,500 5990
SURFACe: APEA (fUl.Ll \5.GIOACRES
RESERVOIR LENGTH
(FULL) 3JMlLES

'drelnotmcljJ,*,IZ.600"r,fHrofd~Milfor'gt
b'/ow 'I'~'tion 517~ INf

During water year 1975, Navajo
Reservoir was kept within the
limits s.pecified by the Bureau of
Reclamation in its interim opera-
tion rules. The reservoir water
surface wag lowered to elevation
6,023 feet during the winter of
1974 and spring of 1975. The
actual April-July inflow to Navajo
Reservoir was 1,114,000 acre.feet,
or 153 percent of the long. time
April-July runoff average ahove
Navajo. The high spring runoff
caused the Navajo Reservoir water
surface to reach elevation 6,074
feet with a live storage of 1,528,.
000 acre.feet late in July.

Releases were scheduled to control
downstream flows to the minimum
lc\'el practicable in order to mini-
mize bank erosion.

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