Elevation difference maps for specified time intervals. Each difference map has a color ramp displaying the elevation change in meters. The difference map that displays changes in elevation between 1952 and 1999 shows that there were areas where the elevation increased by up to 9.2 m and decreased by 9.4 m. These areas appear as thin strips of anomalously high elevation increases and decreases along the central portion of the map and are likely due to imprecision in the location of the channel. In terms of the change in volume, the strips of increases and decreases likely offset each other. DOI: https://doi.org/10.1525/elementa.333.f8