Patrick, Cecil is absolutely right. Why is the water turbid? Turbid can be anything from advanced muddy to kind of grayish. If you have had a lot of recent rain, you may just have a temporary problem that Mama Nature will fix without resorting to chemicals. Suspended sand that doesn't settle is another problem that alum can fix but it can do a job on PH. With no fish, you don't have as much to worry about. Check all of the posts under the Muddy Water heading with some emphasis on Bill Morris's recent fish kill. Also, as Cecil said, get the grass going. Also, throw brush or rocks or something in the gullies that I assume are being created in the dam.