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<br />Bureau of Reclamation
<br />Region 4 Salt Lake City
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<br />002329
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<br />Investigations in Progress
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<br />For complete review of project planning activities, see Planning Status
<br />Summary on following pages.
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<br />Operation of Colorado River Storage Project Reservoirs
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<br />Lake Powell was continued in operation at the 3,490~ to 3,492-foot level.
<br />Available water in exces s of the dis charge through the four generating
<br />units was bypassed through the diversion tunnel and outlet works to hold
<br />Lake Mead above the minimum operating level.
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<br />The May 1, 1965, forecast of runoff in the Upper Colorado River Basin
<br />for the April-July period was 11, 000,000 acre-feet at Lees Ferry. Of
<br />this amount 1,540,000 acre-feet will originate in the Upper Green River
<br />Bas in above Flaming Gorge Dam and 1,140,000 acre-feet will flow into
<br />Navajo Dam on the San Juan River. The months of April and May were
<br />cool, which retardedrunoH somewhat. However, if a generally normal
<br />pattern of flow ensues, Lake Mead will be restored to rated head elevation
<br />'in June and Lake Powell will rise to a new high of 3,522 feet in July with
<br />storage of 7,948,000 acre-feet.
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<br />Heavy power production at Flaming Gorge was cut back on May 1. The
<br />reservoir was drawn down to 5,909 feet m.s.l. elevation in April. The
<br />,runoff will restore Flaming Gorge Reservoir to approximately 5,970
<br />feet m. s. 1. elevation by the end of thesumrner.
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<br />Navajo Reservoir has been ris ing rapidly and is expected to reach ele-
<br />vation 5,996 feet at the end of June. Rising water has now flooded the
<br />Navajo Indian Irrigation Project tunnel heading, causing suspension of
<br />construction operations. Navajo Reservoir will be drawn back to eleva~
<br />tion 5,955 feet m. s.l. as soon as possible to permit resumption of con-
<br />struction work on the tunnel.
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<br />Flood Control Operations
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<br />Early forecasts of generally heavy runoff throughout the region prompted
<br />efforts to prevent flood damages' wherever possible by operation of Bureau
<br />reservoirs. In Utah, the Bureau cooperated with the Governor's Flood
<br />Control Committee. Whereposs ibl e, some res ervoir space was provided
<br />in Bureau reservoirs to assist in control of spring floods even though
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