From the Grand County Water Information Network website:
The Grand County Water Information Network needs volunteers this summer to monitor lake clarity on Grand Lake and Shadow Mountain Reservoir. The Three Lakes Clarity Monitoring Program is part of a multi-year project designed to develop lake-clarity standards at the headwaters of the Colorado River. Monitoring takes less than an hour per week of your time and is your chance to help ensure that our lakes remain clear and healthy. With your invaluable help, we can develop a more accurate and comprehensive understanding of our lake. For more information, please contact Ben Carver or stop by our office at 610 Center Ave in Grand Lake. Read on to learn more about our monitoring programs, or here to find out about other volunteer opportunities.
More Colorado River basin coverage here.