Several small reservoirs were built within a 20 mile radius of Lincoln, Nebraska, for flood control and soil conservation while recreation developed as a secondary benefit. Runoff waters entering the lakes are principally from cultivated farmland. Eutrophication rates, nutrient sources, and eutrophication control were examined. Impounded runoff waters have sufficient nutrient salts to support abundant growths. Projections based upon existing data indicate that the useful life of these reservoirs for body-contact recreation is only a few years. Weed and algae control experiments are very briefly evaluated including one to control photosynthesis by inhibiting sunlight penetration by application of variously colored dyes.