Measuring depth and velocity in large rivers is challenging; traditional survey techniques are time consuming and may not be practical during some flow conditions.  Advanced hydrology equipment and processing techniques can speed data collection, expand spatial coverage, and improve project results.  OneFish used these methods to map a 2 mile stretch of the Yampa River west of Steamboat Springs, Colorado.  A stream restoration project is underway to improve habitat, particularly in the area around an irrigation diversion.  Survey data was required throughout the study area, but could not be obtained using traditional techniques due to deep water and high velocity.