The Snow river area floods every 2 years and Kenai lake will raise 20 feet when this occurs.  The Kenai river is suffering from bank erosion.  I have lived along Kenai lake for 25 years.  A dam would hopefully prevent these two major problems from recurring.  Also, in all the years I've lived here, I have never seen anyone fishing in the Snow river.  If I recall correctly no one even knew salmon existed in that river and I was surprised when it got classified as an anadromous river.