River-wide no wake on the St. Croix kicks in at 683.0 (although it should be lower than that due to the extreme shoreline erosion that results from wakes at water levels that high). To track the river level, go to this website. At the bottom you can link to another site to get forecasts: http://www.crh.noaa.gov/cgi-bin-mpx/ahps.cgi?stlm5