Volunteers with the Catawba Riverkeeper Foundation will test the clarity of water on Catawba River lakes from June 25 through July 17, and Riverkeeper David Merryman is looking for more people to join the project.

Lake visitors will see the volunteers dropping a Secchi disk, a black-and-white weighted disk on a rope, from boats, docks and piers to gather water data, Merryman said in a news release. Data gathered locally will become part of the “Secchi Dip-In,” a project to monitor lakes in the U.S. and Canada.

Merryman also encourages citizens of all ages throughout the Catawba River basin to join the project. Anyone interested can contact the Catawba Riverkeeper Foundation, at 704-679-9494, to receive a Secchi disk, directions and data collection sheets.