. Water Supply and Irrigation Papers of the United States Geological Survey . ilding dams of ordinary height it is possibleto create large reservoirs at many of these lakes. The ArmyEngineer Corps has built and is successfully operating a few reser-voirs at the headwaters of the Mississippi River as an aid to navi-gation. The basin affords numerous opportunities for water-power develop-ment, especially on those tributaries in the States of Wisconsin andMinnesota. (See Pis. Ill, B, IV, and V.) There are valuable powersites on the main stream, the more important of which are utilized orabout to
. Water Supply and Irrigation Papers of the United States Geological Survey . ilding dams of ordinary height it is possibleto create large reservoirs at many of these lakes. The ArmyEngineer Corps has built and is successfully operating a few reser-voirs at the headwaters of the Mississippi River as an aid to navi-gation. The basin affords numerous opportunities for water-power develop-ment, especially on those tributaries in the States of Wisconsin andMinnesota. (See Pis. Ill, B, IV, and V.) There are valuable powersites on the main stream, the more important of which are utilized orabout to be. The following gaging stations have been maintained on the Missis-sippi River and the minor tributaries. Those on the principal tribu-taries are given elsewhere. Mississippi River near Sauk Rapids, Minn., River at Anoka, Minn., River at St. Paul, Minn., Wing River at Pillager, Minn., River near Mankato, Minn., River near Dayton, Minn., River at Manchester, Iowa, UPPER MISSISSIPPI RIVER. 71 MISSISSIPPI RIVER AT ANOKA, MINN. This station, which is located at the highway bridge in the south-western part of Anoka, Minn., was established May 8,1905, to obtaindata for use in studying water power, water supply, pollution, floodcontrol, storage, and navigation problems. The drainage area above the section is about 17,300 square River enters on the left bank about one-half mile below thestation. Winter conditions are severe at this station. Ice forms to a thick-ness of about 2 feet and lasts from three to four months, but thesection is generally open at one or two places during the ice operations, for which the river is extensively used, mayaffect the gage readings to a small extent. Portions of the riverbed are occasionally covered with sunken logs, but these probablyhave little or no effect on the gage heights. The gage reader at this station has b
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