Honeoye Valley Association

Below are the weekly lake reports provided by Terry Gronwall

A general statement about the lake is :


  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.  The DEC will report on their assessment of our
blue-green algae bloom situation for this week late Friday afternoon on
their BGA alert web page.

The weekly water quality data for 2017 can be found in the following file:  2017 Water Quality Data Deep 9 meter.pdf


The Gronwall's visual BGA Update for 


    Monday Morning (8/21)

 we found only very light to light algae visible
in the surface water at all of our monitoring sites.  No algae surface scum
observed at any of our monitoring sites.  There was a significant
improvement from late last week.

  Surface water temperature was 75.6 F on Monday (8/21/17) an increase 2.6 F
from Monday (8/14/17). 

  The last week has been very dynamic for the lake.  Early last week there
was only very light blue-green algae visible.  Then we had a sharp rain
storm Tuesday (8/15) late afternoon.  Wednesday (8/16) we detected that the
storm caused a thermocline disturbance.  This may have caused legacy
nutrients from the bottom sediments to be transported to the surface water.
This probably fueled the isolated blue-green algae blooms that were visible
the later part of last week.  This event seems to have run its course based
on the light amount of visible blue-green algae observed this morning
(8/21).

Mon. 8/14 Mon. 8/21 Weekly Change
Surface Water Temperature (F): 73 75.6 2.6
Water Clarity (Ft): 5.9 4.3 -1.6
Lake Level (Ft): 803.11 803.12 0.01
Lake Level Relative to Weir (Ft): -0.39 -0.38 0.01


 

  Tuesday Morning (8/15)

We found only very light algae visible in the
surface water at all of our monitoring sites.  No algae surface scum
observed at any of our monitoring sites.  Our gleotrichia bloom appears to
have ended.

  Surface water temperature was 73.0 F on Monday (8/14/17) a decrease of 1.5
F from Monday (8/7/17).  The surface water temperature was ~79 F on August
2nd.  We have had a 6 F surface water temperature decrease in the last 2
weeks.  This large a surface water temperature decrease is very unusual in
August.



Mon. 8/7 Mon. 8/14 Weekly Change
Surface Water Temperature (F): 74.5 73 -1.5
Water Clarity (Ft): 5.9 5.9 0
Lake Level (Ft): 803.17 803.11 -0.06
Lake Level Relative to Weir (Ft): -0.33 -0.39 -0.06



Monday August 7th:

    Monday Morning (8/7), we found very light to light algae visible in the
surface water at most of our monitoring sites.  Only our North Shore site
had green looking surface water.  This was probably caused by Monday's South
wind.  We did not see any blue-green algae surface scum at any of our
monitoring sites.  The gleotrichia bloom appeared to be subsiding. 

  Surface water temperature was 74.5 F a decrease of 2.0 F from Monday
(7/31/17).  This is a very large decrease in water temperature over a one
week time period.  Water clarity increased by 2.3 feet to 5.9 feet.


Mon. 7/31 Mon. 8/7 Weekly Change
Surface Water Temperature (F): 76.5 74.5 -2
Water Clarity (Ft): 3.6 5.9 2.3
Lake Level (Ft): 803.25 803.17 -0.08
Lake Level Relative to Weir (Ft): -0.25 -0.33 -0.08


Monday, July 31, 2017

  

  Monday Morning (7/31), with calm winds, we found blue-green algae with
surface scum in several isolated near shore areas.  Particularly near shore
areas that are protected from the wind with dense aquatic vegetation.  This
means that the blue-green algae gets trapped in these areas.   Water clarity
increased about one (1) foot over the last week as the effects of last
Sunday's rain storm abate.

Mon. 7/24 Mon. 7/31 Weekly Change
Surface Water Temperature (F): 77.9 76.5 -1.4
Water Clarity (Ft): 3.6 4.6 1
Lake Level (Ft): 803.52 803.25 -0.269
Lake Level Relative to Weir (Ft): 0.02 -0.25 -0.269

  

  Monday Morning (7/24)

With calm winds, we found blue-green algae in
several isolated near shore areas, particularly along the north shore, and
in open water.  The lake was very turbid due to our Sunday afternoon rain
storm.  This caused a decrease in water clarity of about 4.5 feet.  

Mon. 7/17 Mon. 7/24 Weekly Change
Surface Water Temperature (F): 77.7 77.9 0.2
Water Clarity (Ft): 8.1 3.6 -4.5
Lake Level (Ft): 803.37 803.52 0.149
Lake Level Relative to Weir (Ft): -0.13 0.02 0.149


Monday July 17th:

With calm winds, we found blue-green algae in
several isolated near shore areas and few places on open water.  The surface
water temperature was 77.7 F.  This was an increase of 2.9 F from Monday
July 10th.  This is a very large temperature increase for a one week time
period.  The lake's water level is close to normal.

Honeoye Lake Data
Mon. 7/10 Mon. 7/17 Weekly Change
Surface Water Temperature (F): 74.8 77.7 2.9
Water Clarity (Ft): 8.2 8.1 -0.1
Lake Level (Ft): 803.17 803.37 0.2
Lake Level Relative to Weir (Ft): -0.33 -0.13 0.2


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