Save Our Streams




Save Our Streams (SOS) is our national watershed education and outreach program that was started at the Rockville Chapter. Since 1969, we have cleaned up stream corridors, monitored stream health, and restored degraded stream banks. For more information on the nationwide program, see the National IWLA Website


The insects and crustaceans that live in a waterway are indicators of water quality because all organisms require specific conditions to live. The Izaak Walton League uses the presence of benthic macroinvertebrates to measure water quality. Macroinvertebrates are large enough to see with the naked eye (macro) and have no backbone (invertebrate). Benthic macroinvertebrates live in the benthos, or stream bottom, and include insect larvae, adult insects and crustaceans. The chapter conducts quarterly monitoring of Seneca Creek near the lake. We normally monitor Seneca Creek on a quarterly basis. The dates and times are in the Newsletter and on our Calendar.