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<br />PACIFTC SOUTHI'1EST INTER-AGENCY COMMITTEE
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<br />DFPAR1MENT 0 F THE INTERIOR
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<br />FEB 15 1957
<br />COLO. WAT!/!
<br />CONSERVATION IW~fl
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<br />ClEO IOGICAL SURVEY ,
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<br />PROGRESS S'DI-'I'EMENT PACIFIC SOUTH\lJEST REGION
<br />JULY w PECEMBER 19,6
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<br />The following report on -current activities of the Geological Survey- in
<br />the Pacific Southwest Region is submitted as the Surveyfs semi-annual re-
<br />port to the Pacii'ic Southwest InterwAgency Committee.
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<br />Water Resourc~s Investj.gations
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<br />A;rizona
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<br />Runof.! in AriZona during the period was deficient throughout the State.
<br />No major floods occurred during the summer rainy season and runoff during
<br />the period was the lowest of record at many stations. The flow of the
<br />Colorado River approximated only 55% of the median for this period.
<br />storage in the majorr9servoirs is generally less than last year and below
<br />average.
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<br />Colle,ction of st,reamflo~r ,records was cOlltinued a,t 116 gaging stations.
<br />Stations es"j;ablished during the report period were asfoliowsl Goat Well
<br />Wash below DrqP structure, near Solomon; Lower Gold Gulohbelow HJ(
<br />Detention Reservoir. near Bowie; San Simon Creek 1;>elow Fandrop Detention
<br />Reservoir, ,ne8J', Bowie; UPPl3r, Gold Gulch be:j.ow, creighton Detention Reservoir,
<br />near Bowie. Stations reestablished during the period wer,e Enterprise Canal
<br />at Gillespie Damz.and Gila Bendpanal at GillespieDam.C911ection of base
<br />hydrologic data in San Simon Valley at the four ,newly established stations
<br />lis ted above 1jegan dur1ng the period. The effect of proposed parrier
<br />struoture on San Si1!1on Creelt runoff is being studied, in cooperation with
<br />the Bureau 0 f Land Management.
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<br />Investigation of spring flow in theMt. Lemmon areas is being con~
<br />tinued at the request of the Corps of Engineers.
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<br />Studies for the Southwestern Drought Report have been completed and
<br />wri ting of the report is scheduled for completion in January.
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<br />Collection of basic data was continued as a m/jojor part of the threew
<br />phase Federal~State cooperative program. The objectives of the data
<br />collection program are: (1) to aid in the prediction of ,trends in ground';'
<br />water levels as related to present a,nd future ground-water supplies; (2)
<br />to delineate the present areas of greatest development as well as to
<br />establish the virgin ground-water conditions o.! areas (if potential future,
<br />development; (3) to aid in the determination of the lrydrologic
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