READING THE GAGE: (Following the blue-line) The most recent reading on the, Gage height, feet graph, is on the far righthand side at the end of the blue-line. The river heights are displayed virtually on the left hand side of graph. Once the height of the river is determined, match that reading with the Caution Banners displayed above. NOTE: If the USGS graphs are not displaying below, please click the USGS Direct Link that is provided.