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  • Terry Gronwall

Monday July 24th, 2023 Honeoye Lake Water Quality

Updated: Jul 25, 2023

Town of Richmond has received an Emergency Permit from the New York State Department of Environmental Conservation (DEC).

This permit will allow the Town of Richmond to remove 2 Gravel bars in Honeoye Creek.

⚠️ Road Work Notice - East Lake Rd ⚠️

The entire length of East Lake Rd is scheduled for repaving on July 10th, 11th, & 12th. Stone and oiling is set for July 25th.

More information on these projects I available on the Town of Richmond’s web site:


Monday July 24th, 2023 Honeoye Lake Water Quality

Surface Water Temperature: ~77.9 F

Water Clarity: ~11.5 Feet

Lake Level: ~803.9 Feet above sea level

Lake level relative to long term average lake level: +0.4 Feet

Observations: Monday (7/24/23), Over the last week the water clarity increased by ~1.0 foot to ~11.5 feet and the surface water temperature decreased by ~0.2 F to ~77.9 F. Lake level has remained about the same over the last week. Water clarity was very good for late July. Another very nice day to be out on Honeoye Lake!

We still found sparse Gloeotrichia (Looks like a porcupine) both in near shore areas and open water. We also found increasing amounts of Anabaena (Dolchospermum) (Looks like a spring). Anabaena usually shows up in mid-July. So, it is right on time. We also found Aphanizomenom (Looks like a leaf) and Planktothrix (looks like a small rod) for the first time this summer. These are all blue-green algae species. You should be watchful for blue-green algae blooms lake wide. Expect to continue to see blue-green blooms over the next few weeks. See pictures below: More information on Gloeotrichia and Anabaena can be found at:

We did not expect the DEC Alum Treatment to reduce our traditional Gloeotrichia blooms starting in mid-June given that the Alum Treatment was in water depths 18 feet and deeper. When Gloeotrichia dies its seed goes to the lake bottom in shallow water. Then in the spring it acquires nutrients directly from the shallow water bottom sediments. Then blooms.

Several research studies have found that most of the phosphorus that fuels Honeoye Lake’s blue-green algae blooms is released from the lake bottom sediments when the lake’s dissolved oxygen level goes below 0.50 mg/L in the deeper parts of the lake. The dissolved oxygen (DO) level near the lake bottom between 7-9 m (~23-30 feet) was only 0.47-0.36 mg/L today. The DEC’s Alum Treatment last November should prevent the phosphorus from being released when the DO is less than 0.50 mg/L. We will all know how effective the Alum Treatment is by observing how severe a blue-green algae bloom we get when the lake mixes in a few weeks due to a strong wind. Lake was stratified at ~6 m (~20 feet) deep today. Today’s, Monday July 24th, temperature and dissolved oxygen graphs are shown above:

Please report any Honeoye Lake HABs you observe to us and DEC by submitting a HABs report at:

Always use your own visual assessment before making contact with the lake water at this time of year as the blue-green algae situation can change daily if not hourly. Please regularly check the DEC HABs alert map for more detailed updates on Honeoye Lake HABs alerts:


July FLCC Muller Field Station Events

Click on the link below to see the July Muller Field Station Newsletter:


New York Safe Boating Class Certificate will be required of all boaters on this schedule:

If born on or after: You will need boating safety certificate to operate motorized vessel in:

January 1, 1988 2022

January 1, 1983 2023

January 1, 1978 2024

All operators of motorized vessels, regardless of age, will need a boating safety certificate by January 1, 2025.

Click on the link below for more information and the schedule of local NYS Safe Boating classes:


Honeoye lake is included in the DEC's Big Panfish Study. Please click on the link below to read their Interim report:


Please visit the Honeoye DEC Project website for more information on the Honeoye Lake Nutrient Inactivation (Alum Treatment) Project: Honeoye Lake Nutrient Inactivant Pilot Study (


Glacial History of Honeoye Lake

Please check out the new “Glacial History of Honeoye Lake” sign at Sandy Bottom Park.

Thank you to Dr. Bruce Gilman for the content, the Ontario County Water Resources Council for the funding, and the Finger Lakes Land Trust for the imagery.

More information on Honeoye Lake’s Geology History can be found on HLWTF web site:


Please click on this link for the Winter 2023 HLWTF Newsletter:


- Click on this link to see the new HLWTF Honeoye Lake Watershed Storm Water Took Kit if you are planning any storm water projects on your property:


Click on the blue outlined box that says "Log in / Sign up" in the upper right-hand corner of this page to sign-up to be notified when we update our weekly Honeoye Lake water quality blog.


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