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000037 GEOLOGICAL SURVEY The ~ap on the opposit8 page shows the locat~on of strean- caGinG stations operated by the GeoloGical Survey in the regular and de!,JaJ'tnental procram and the areas on Hhich eround-llSter studies are bein2; nade in the llissouri River Basin. ~later Resou~ Investigations ., Surface Hater: By the end of fiscal year 19l.C, 165 strcan- gaging stations lIere opera tee' in the Departnental progran in a(',.;i'.;1on to op..1roximately 500 rer;ular streerl-gaging stations operatec' in coo!,Jeration lIi th states al1d other Federal seenoies. Ground Hat'll': Ground-lIater studies Here conducteC1 in coo~)eration \lith llissouri Basin states, ;1ost notably Kansas, Nebraska, and HjroIninr:;. 3tudies in Colorado and North Dakota lIere made mostly in areas outside the Basin. InvestiGations in I01.la \lere limited a~ no coo~)erative Hork lIa~ perfomed in Hontana, l1ismuri, and South Dakota. Considerable assistallce Has received from the Bureau of Reclamation in the construction and measurenent of snaIl diameter observation lIells and the making of pumpinIT tests. On Nov81:tber 14, 1947, a conference lIas held in Denver with representatives of tho Buree.u of Reclam:tion for '.;l\e purpose of norc clearly definine the res;Jonsibilities of the Survey pertain- ing to ground-uater studies under the JIissouri nlver Basin prograr.l. As a result of t:,e conference, it Has felt the e'.utiea and res!,Jon- sibiliti<3 -, of t:,e Grounc~-Hater Dranch \lere clarified a;1d ground \lork for coordination bet\leen tho aG8ncies involved an.; the cooperation of field :Jen \las laid. Th<3 ta')ulation on t.he fOllowinG pace m=~arizes the principal ite:ls of ,'ork Hhich Here ;:>erfomed b-.f the Groll..'1d-Water Branch during the f.bcal year on each of the ;,rojects or unit area::!. QuaH ty of HatiZL and Secjinent Ip'yesttgatio..!ll!: Investigations of the r.rineral constituents and fluvial s<3dinentG in l~aters of trib- utaz:' str<3a;".ls, tOITGther \lith studies of the mineral ,,"ualit:.' of ground lIaters in oreas to be placed under irrigation, and of several pro- posed rlll..'1icipal ~Iater sU;Jplies lIere carried on durin" the year. , The chenic"l anal~'se8 of surface water s!1Llples \lere continuec. at 16 comprehensive and 63 rti.scellaneous sl11.~;.>ling stations located at regular stre"'.,'-raging ::;tatlcns thro~'c;hout the BaGin. The !,Jrolimina- ry inv<3stications of the mineral quality of ['round lIaters included 33 proposed irrieation u.aHa ane, 3 mu..'1icipal supplies. Prelininary reports on the '1uali t~' of surface \laters 'Iere cOlOlpleted, and ac'vance .. 67