Secchi Disk Program

On Canandaigua Lake, Dr. Bruce Gilman, Dept. of Environmental Conservation and Horticulture at FLCC, has been measuring secchi disk water clarity since the 1980’s at two mid-lake stations. For the last several years, Canandaigua Lake Watershed Association volunteers have also collected weekly secchi disk data at over 16 locations around the lake. This cooperative monitoring helps us learn about the factors that affect water clarity and overall lake health.

2017 Data for Water Clarity Monitoring

The below chart illustrates current data collected from the 2017 CLWA secchi disk volunteers. Data is updated weekly. Thanks go out to our long standing Volunteers: Dee Crofton, Gary Helming, Kevin Hefner, Scott Hill, Bruce Kennedy, Marty Lasher, Wade Sarkis, Lynn Thurston, Vickie Tucker, Bill Yust, and Steve Zumbo. We also welcome our NEW volunteers for 2017: Kathy Bromley & Greg Talomie, Amy Bowen, Rob Gray, Nadia Harvieux, Bill Mehls, and Brian & Dolores Perkins!
For web

Clarity readings dropped this week after the June 15th storm event that blew through the watershed. A boating advisory is still in effect for Canandaigua Lake, as issued by the Ontario County Sheriff’s Department. Downpours have left debris in the lake, including logs and large tree limbs that could be hit by a boat. Boaters are urged to drive at no more than 5 mph within 200 feet of the shoreline.Ontario County Sheriff Phil Pavero urges boaters to use low operating speeds because the lake is very murky due to runoff from the recent rains. He also urges boaters and passengers to wear personal flotation devices (life jackets or life vests) at all times.

Concerned about water clarity? 

See our quick blue green algae guide or visit the NYS DEC website and NYS DOH website for more information on blue green algae.  If you have any questions or see a suspicious bloom, please email or

Interested in Volunteering? 


Secchi Disk volunteers use their own boats to go out on the lake and take weekly recordings. Findings are reported electronically, which makes real-time response to a possible critical condition possible. The additional data gathered by volunteers helps us supply more detail to the ongoing “picture” developing of Canandaigua Lake.

For more information, contact the CLWA office at (585) 394-5030 or email us.