1983 ALGAL BLOOM 1970’s: Phosphorus Controls Installed at Blue Plains and Elsewhere to Control Algal Blooms 1983: High Spring Flows, Low Summer Flows, Below Normal Wind Speeds, Higher Temperatures July –November :Microcycstis Bloom From Piscataway Creek to Indian Head, Maximum Concentrations > 200ug/L pH Rises from 7 to 9-10 in Vicinity of Bloom