(--, Data not available; referenced water levels have been measured during on-site inspections; all elevation values are in feet above sea level as represented by the National Geodetic Vertical Datum of 1929 (NGVD 1929); maximum and minimum values refer to instrument-logged water levels collected since the 1984 water year, and prior to the current water year. Stations with less than 5 years of instrumented record are excluded from comparison. )