Search
  • Terry Gronwall

September 24th, 2020 Lake Update (Click Here)

Updated: Sep 24

The Town of Richmond and Ontario County Soil & Water Conservation District obtained DEC & Army Corp of Engineers permits to remove shale and sediment from the Honeoye Outlet Creek just South of the 20A bridge that was obstructing the flow of the Outlet Creek draining Honeoye Lake and the wetlands in Sandy Bottom Park. Work started last Monday September 21st. They have made rapid progress as the pictures below show:



We noticed today, Thursday September 24th, 2020 that the lake had about the same amount of algae in the water column and water clarity at our open water monitoring site as last Monday. However, all of our near shore monitoring sites had less visible algae in the water column with increased water clarity than last Monday. We did not see any algae surface scum today. However, there is still a lot of algae in the water column, so if we get another weather pattern of 80+ F temperature, calm wind, and sunny skies, we could have a flare up of a blue-green algae bloom again. All near shore locations we checked today looked like the pictures below:



Today, Thursday September 24th, 2020, the lake was still isothermal. Isothermal means the water column has uniform water temperature from top to bottom. The water temperature was about the same as last Monday due to warmer weather this week. The dissolved oxygen level is still relatively high and well mixed from top to bottom. This means that currently no additional legacy phosphorus is being released from the bottom sediments.

1 meter (m) = 3.3 Feet and 1 Degree Centigrade ( C ) = 1.8 Fahrenheit (F)

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:

https://nysdec.maps.arcgis.com/apps/webappviewer/index.html?id=ae91142c812a4ab997ba739ed9723e6e


September 21, 2020 Honeoye Lake Update (Click Here)


The Honeoye Lake Aquatic Vegetation Management Program is winding down for the 2020 season. The team is working half days through Thursday, 9/24 with services limited to shoreline pickup of raked plants. More information can be found at https://townrichmond.digitaltowpath.org:10135/content/News/View/7

Surface Water Temperature: 65.8 F

Water Clarity: 5.5 Feet

Lake Level: 803.4 Feet above sea level

Lake Level Relative to Weir: -0.1 Feet

Observations: Monday (9/21/20), lake is still experiencing a lake wide blue-green algae bloom due to the nutrients that were mixed in the water column on Thursday 8/20 when the lake had its traditional late August lake mixing (turn over) event. Today there still was medium to heavy Anabaena and Microcystis (blue-green algae) visible in the water column at most of our near shore and open water HABs monitoring locations. We did not see any algae surface scum. However, there is still a lot of algae in the water column, so if we get another weather pattern of 80+ F temperature, calm wind, and sunny skies, we could have a flare up of a blue-green algae bloom surface scum again. We took the picture below today in open water to show you that there is still a lot of algae in the water column:

Anabaena and Microcystis are a species of blue-green algae that we see starting usually after a lake mixing (turn over) event. Anabaena and Microcystis have the potential to produce toxins that can be harmful to people and pets. We strongly urge you to follow the DEC guidelines of “Know it, Avoid it, Report it” For more info go to: https://www.honeoyelakewatershed.org/habs

Water clarity increased 1.5 feet to 5.5 feet over the last week. This is lower than normal water clarity for late September (Water Clarity Ave. ~6.6 Feet) due to a moderate amount of algae in the water column. Surface water temperature declined about 4.2 F to 65.8 F. Lake level was 803.4 feet above sea level about the same as last week.

Today, Monday September 21, 2020, the lake was still isothermal due to the cooler fall air temperatures we have been having over the last week. Isothermal means the water column has uniform water temperature from top to bottom. The dissolved oxygen level was also relatively high and well mixed from top to bottom in the water column. This means that currently no additional legacy phosphorus is being released from the bottom sediments given the relatively high dissolved oxygen level near the bottom.


1 meter (m) = 3.3 Feet and 1 Degree Centigrade ( C ) = 1.8 Fahrenheit (F)


Now that the lake has mixed (turned over), we are likely to have Anabaena and Microcystis blooms until our cooler fall weather significantly lowers the water temperature. An Anabaena bloom looks like pea-soup and a Microcystis bloom looks like green paint on the lake surface. Be extra watchful for new blue-green algae blooms for the rest of the summer. Please report any suspicious blooms to us at watershedtaskforce@gmail.com and the NYSDEC at https://survey123.arcgis.com/share/66337b887ccd465ab7645c0a9c1bc5c0

Blue-green algae's optimum water temperature for growth is 75 F (24 c) and warmer. Once the water temperature starts falling below 75 F (24 c) the algae's growth rate starts to slow. Then the bloom slowly dissipates as the water temperature declines in the fall. You should watch our weekly water temperature trend for the lake getting colder and water clarity increases to signal that this blue-green algae bloom is starting to dissipate. The water temperature has been dropping a couple degrees Fahrenheit per week, but the water clarity has just started to increase over the last week meaning the blue-green algae bloom that started a few weeks ago has started to dissipate. We will keep you posted on these indicators.

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:

https://nysdec.maps.arcgis.com/apps/webappviewer/index.html?id=ae91142c812a4ab997ba739ed9723e6e

77 views

Honeoye Lake Watershed Task Force Members:

Town of Richmond

Town of Canadice

Town of Bristol

Town of South Bristol

Town of Naples

Honeoye Valley Association