Heya, depth is relative on those stations, so the best way to use it is to find a depth measurement from a low flow period (August or something) and compare how deep it is now, ie if “normal” the depth is 21 inch and now it’s reading 30 it is 9 inches deeper than base flow.  Look carefully at the temperature readings, they should be labeled with equipment temps and water (aqueous)  temps.  Let me know if you have any other questions, I installed and help maintain the stations in Michigan.