The Secchi Disk is a 12-inch black and white plate attached to a rope or chain and lowered into a body of water until it is no longer visible. The depth at which the disk can no longer be seen is ...

In celebration of Lakes Appreciation Month, the annual Secchi Dip-In will be held from 10 a.m. to noon July 31 at Loch Lomond Reservoir. The public is invited to this outdoor, family-friendly event to ...

A simple 19 th Century tool is still useful to ocean scientists in the age of satellites, new research shows. A Secchi disk – historically called a “dinner plate” by sailors – is used in the open ...

Katie Senft, a researcher with the UC Davis Tahoe Environmental Research Center, lowers a Secchi disk to measure lake clarity in June 2021. Center researchers take dozens of such measurements ...

Bob Lewis is proud of the award he carries with him in his boat. The avid angler and boater has taken part in every Secchi Day event at Beaver Lake since it started in 2006. The Beaver Water District ...