WSP04347

• File Number: 8282.600.10
• Description: Colorado River Operating Annual Reports
• Basin: Colorado Mainstem
• Date: 1/1/1977
• Author: USDOI/BOR
• Title: Operation of the Colorado River Basin 1977 Projected Operations 1978
• Water Supply Pro - Doc Type: Publication

Glen Canyon Dam, lake Powell

STA TlSTlCS
ACTIVE STORAGE"
RESERVOIR

IACRE- ELEVATION
FEET) (FEET!
25,002.000 3700
9.428,000 3570
4.126.000 3490
16J,390ACAES
186MILES

During water year 1977, Lake Powell was operated
as part of the Colorado River Storage Project in
accordance with governing compacts and laws to
provide river regulation, optimum power produc-
tion. recreation opportunities, and fish and wild-
I ife benefits.

On September 30. 1976, Lake Powell water sur-
face elevation was at 3.664 feet with an active
storage of 19,640.000 acre.feet. During the fall
and winter months of 1976-77, the reservoir water
level dropped about 13 feet to elel'ation 3,651 feet.
Low releases from Glen Canyon Dam during April,
May, and June allowed the Bureau to integrate
purchased power into the Colorado River Storage
Project system when it was more readily available.
The April-July 1977 runoff of the Colorado River
at Lees Ferry, Ariz., was 1.1 million acre.feet, or
14 percent of the long.time average. By the end
of water year 1977, the level of Lake Powell had
receded a total of 27 feet to elevation 3,637 feet.
(Chart 7.)

OUTFLOW

14

MAXIMUM STORAGE
RATED HEAD
MINIMUM POWER
SURFACE AREA [FULL!
RESlRVOIR LENGTH (FULLI
POwER Pl.ANT
NUMBER OF UNITS 8
TOTAL CAPACITY OF UNITS 900,000 KILOWATTS
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