I've been asked a few times how the water discharges are managed from Lake Moultrie, in particular, into the Santee and Cooper Rivers. In case there may be someone else who has the same question, I decided to post a brief explanation here, as I understand it. I work for the Fresh Water Fisheries group at SCDNR, and the flows through both the Rediversion Canal into the Santee River and the Pinopolis Dam into the Cooper River have an effect on what we do: The water discharge from Lake Marion and Lake Moultrie is totally controlled by Santee Cooper, depending on lake levels, power demands, etc. DNR doesn't have a lot of influence on them, although we do make requests for water flows through the rediversion during the fish lift season, in order to have adequate attraction flows to help bring the spawning Blueback Herring and American Shad into the fish lift. During drought years, we get very little flow from them. They also operate the lock gates at Pinopolis several times a day during that time to allow fish passage from the Cooper River into Lake Moultrie The discharge through the rediversion canal is tightly controlled, depending on SC's target for lake levels. When levels are high, such as they have been this spring, then more water is sent through the turbines there, in order to control lake levels. When the lake levels drop to or below target, then flows will stop or slow down through the St. Stephen generating station. The Army Corps of Engineers mandates a minimum daily average flow through the Pinopolis dam (Jeffries Hydroelectric) in order to keep salt water from backing too far up the Cooper River, which would be detrimental to industries that use water from there, therefore, we have daily discharges into the tail race canal. There is also a minimum mandated discharge into the old Santee River below the dam on Lake Marion, in order to keep Santee River from becoming stagnate. The only time water is discharged through the Santee dam is when lake levels experience a rapid rise that can't entirely be controlled by discharging through Pinopolis or St. Stephen. This would be considered wasted water by Santee Cooper, since there is no generating facility at Santee Dam, other than a small turbine that uses the mandated minimum daily flow. The best way to know when water will be released is to call the Santee Cooper Lakes Information Hot Line at 1-800-92LAKES. The recorded message (updated daily around 10am) gives current inflows into the lakes, and estimated generating schedules for that day and the next. You can also look online at http://waterdata.usgs.gov/sc/nwis/u...on&format=gif_stats&period=7&site_no=02171645 for discharges on the Rediversion, which may help establish a pattern, and at http://waterdata.usgs.gov/sc/nwis/uv/?site_no=02172002&PARAmeter_cd=00065,00060,00062 for info on the tailrace at Pinopolis. http://waterdata.usgs.gov/sc/nwis/current/?type=flow&format=pre gives streamflow and lake levels for the entire state.