Hydrographic Surveys of the Missouri River at Ponca backwater, 2011-13
An Innerspace 456 single-beam echosounder in conjunction with a Trimble® differential Global 
Positioning System (DGPS) and HYPACK® navigation software, and Ashtech Z-Xtreme and 
Trimble® R8 GNSS receivers was used to survey 7 chutes and 3 backwaters on the Missouri 
River yearly from 2011-13. These chutes and …