Models of wind-induced vertical mixing and nitrogen-limited phytoplankton growth produced data for a management model for Moses Lake, a hypereutrophic lake in eastern Washington. This approach preserved the simplicity and flexibility of the management model without sacrificing the advantages offered by complex models. The model considers two-week periods and was calibrated and verified with limitations. While the model predicts bloom times and maximum well, the decay of blooms is not predicted well in one out of three cases. The model evaluated scenarios of dilution water inputs and best management practices strategies. For the Moses Lake watershed a constant dilution water addition of 5.7 m3/sec produced significantly greater chlorophyll a reductions when compared against no dilution or 30 m3/sec springtime dilution scenerios. Reductions in chlorophyll a were demonstrated with decreased nutrient loading into the lake (such as controlled fertilizer additions to irrigated land).