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<br />On .June 10, 1970, the CriterIa for Coordinated !.ollr,..I:ange Operation of
<br />Colorado Hi vcr Tleflcrvoirs promulr,[Ited pur!=lul\nt to r. J.. 1)0-:>37 wen:
<br />publiHhed in the Federal I\er,iater. Rele,aRes to the !.a"er l\aain I.n water
<br />years 1971 through 1974 In accordance with these Crf terf II have heen llD
<br />fo11o",s:
<br />
<br />(Unit: 1,000 Acre-Feet)
<br />
<br />Annual
<br />
<br />10-year
<br />PerIod
<br />Endinl',
<br />Sept. JO
<br />
<br />Release
<br />from
<br />Lake powell
<br />
<br />Flow at Lee
<br />Ferry, Ari~!,a
<br />
<br />10-Year Total Flow
<br />at Lee Ferry, ArizoI1.1
<br />
<br />1970
<br />1971
<br />1972
<br />197J
<br />1974
<br />
<br />8,672
<br />8,591
<br />9,311
<br />10,110
<br />8,256
<br />
<br />8,088
<br />8,607
<br />9,3JO
<br />10,141
<br />8,270
<br />
<br />78,8JO
<br />80,763
<br />75,309
<br />82,930
<br />88,773
<br />
<br />I\elcases durIng water years 1970, 1971, and 197L were scheduled to
<br />assure delivery of at least 75 million acre-feet In the 10-year
<br />period 1963 through 1972, required by Article 11I(d) of the
<br />Colorado River Compact. The release of 10,110,000 llcre-feet during
<br />1973 included about 1,425,000 acre-feet in excess of the Criteria
<br />requirement ",hich was ordered released hy the Federal District Court
<br />in Salt Lake City during the Rainbo", BridCe suit. !lad this additional
<br />water not been released as a result of the court order in 197J, the
<br />release in 1971, would have been increased by about 675,000 acre-feet to
<br />a total of about 8,9JO,OOO acre-feet in order to maintain storage in
<br />Lake Nead equal to that in Lake Po"ell at the end of water year 1974
<br />as providp.d by the Criteria.
<br />
<br />(ll) Durinr. the hoatinj,l; or river-'runn1nr, fiCRfiOll. con!=lldern--
<br />tion has heen given to mainjflinlnr. riverflows at lUw1gable lcvel~.
<br />A minimum level of 3,000 ft /s is currently being "",lntnined durin,-, the
<br />early morning hours ",ith a target level of 8,000 ft3fa durinr, the
<br />daytime. Special efforts have been lTlllde in cooperation with other
<br />Bureau power projncts and prIvate utilities to malntaln these flows
<br />during Ilollday ",eekends when there are many recreational boaters on tl~
<br />rIver, even though electric po",er system loads are much lighter than the
<br />remainder of the ",eek. MaIntenance of adequate flows for hoaters during
<br />spring has in many instances penalized power system opera tions by
<br />reducing system ability to utilize 10'" cost enerl',y available in adjacent
<br />power systems.
<br />
<br />9
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