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  • Terry Gronwall

Monday July 8, 2024 Honeoye Lake Water Quality


Monday July 8, 2024 Honeoye Lake Water Quality


Surface Water Temperature: ~79.3 F

Water Clarity: ~10.2 Feet

Lake Level: 803.5 Feet above sea level 


Observations: Tuesday (7/8/24), Water clarity was ~10.2 about 2.0 feet higher than Tuesday 7/2.  This water clarity increase was mostly due to the sunny morning.  The surface water temperature increased ~6.6 F to ~79.3 F from Tuesday 7.2 due to the warmer weather we have been having recently.  It was a very nice day to be out on Honeoye Lake!


We were able to check our 10 near shore locations around the lake for blue-green algae blooms today.  We visually could see Gloeotrichia, a blue-green algae, of varying intensity at all 10 locations that we checked today.  The heaviest Gloeotrichia surface booms were found where the wind was blowing into the near shore water.   See pictures below:  The Sandy Bottom Park Swimming Beach is currently closed due to a blue-green algae bloom.  Since we only check 10 locations along the 10 miles of Honeoye Lake shoreline there is likely to be several other locations currently experiencing blue-green algae blooms this week.  Please regularly check the DEC HABs alert map for more detailed updates on Honeoye Lake HABs alerts:


We found increasing amounts of Gloeotrichia (lots of small spikes) today both in near shore areas and open water in the water column.  Some locations had a surface bloom.  Also, found Aphanizomenon (looks like a leaf).  We did not find any Anabaena (Dolchospermum) (looks like a spring) in today’s algae sample, but expect that it is still present.  You should be watchful for Gloeotrichia, Anabaena, and Aphanizomenon blooms lake wide.  These are all blue-green algae species.  Expect to see Gloeotrichia, Anabaena, Aphanizomenon blooms over the next few weeks particularly when we have 80-90 F days with calm winds.  See pictures below:  More information on Gloeotrichia and Anabaena can be found at: 


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 at ~9.0 m (~30 feet) was ~0.84 mg/L today. So, phosphorus should not currently be released from the bottom sediments.  However, we expect the dissolved oxygen level will drop below 0.5 mg/L in the next few days potentially releasing phosphorus from the bottom sediments that could fuel blue-green algae blooms when the lake mixes again. The lake has stratified again.  Today’s temperature and dissolved oxygen graphs are not available yet.  They will be added to the blog when available in the next day or two.  Check back later this week to see them.


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:


The Town of Richmond has posted an update on their plans to address the Mill Creek and Outlet Creek issues on their town web site. You can read their update by clicking on the link below:


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


Click on the link below to see the Honeoye Lake Watershed Task Force 2024 Winter Newsletter:


DEC Big Panfish Initiative (BPI)

The Big Panfish Initiative (BPI) was developed to create destination fisheries for larger size panfish in select waters including Honeoye Lake. The BPI is an experimental program that is being conducted to determine the impacts of lower harvest and minimum size limits on sunfish population age and size structure in select lakes throughout New York and to evaluate the level of angler satisfaction with this management strategy. It also includes an assessment of crappie population age and growth characteristics in select waters to determine if those waters have the potential to yield larger fish under more conservative harvest regulations.

Review complete details in the Big Panfish Initiative Study Plan, 2021-2026 (PDF)

DEC BPI Study Updates can be found on the links below:


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:


- 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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