LHWPG Current Lake Assessments and Reports

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While years ago, Lake Harmony was 31 feet deep in some areas, the depth and volume was decreasing rapidly because storm sewer sediment was draining into the lake, along with accumulating leaf debris, construction waste, vegetative growth and residues from human activity.  Action needed to be taken to save the lake. 

Enabled by your donations and community support, initiatives with 1-Clean-Flo International and 2-Natureworks have helped to slow down this deterioration of the lake in recent years.  The current reports for these initiatives are linked below.

1. Clean-Flo International Oxygenation-Inversion System Program

The Clean-Flo system oxygenates and mixes the entire lake using bubblers to accelerate the decomposition of lake bottom contamination.  The system has been operating since June 2018.

Follow the link below to access the current Lake Harmony Biobase Scan report from Clean-Flo International, published in October 2021.

Clean-Flo Lake Harmony Biobase Scan Oct. 2021

"In summary, Clean-Flo's oxygenation-inversion system and product treatments continue to achieve exemplary results on Lake Harmony.  The maximum depth, average depth, and volume of the lake have increased steadily over time.  The bottom composition has hardened consistently from year to year. The overall increase in volume and corresponding sediment reduction have amounted effectively to tremendous removal of material from the lake that through conventional dredging might have cost millions of dollars.  Clean-Flo's biodredging approach to sediment reduction has been proven effective and the unit cost of the approach has likely been a small fraction of dredging costs.”

Learn more about the Clean-Flo technology on their website: www.clean-flo.com

2. Natureworks Vegetative Treatment Program

Natureworks conducts surveys of vegetative growth all around Lake Harmony and provides reports on lake depth and volume.  These reports are used to develop a strategy for treating the lake in the most effective way to reduce the vegetative growth while improving overall lake health.

The current Natureworks survey data and report from June 2022 is linked below.

Natureworks Lake Harmony Survey 6.21.2022.pdf

The June 21, 2022 Survey summary email report provided by Natureworks stated that “Overall the lake looks good. Water quality testing results as well as clarity are very good.  Plant growth is beginning along the shoreline in the shallow cove areas.”  A map is provided in the survey report and also shown below.  This map shows pondweeds and bladderwort growth in the Split Rock cove and American pondweed toward the shoreline in the middle and end of the lake by Nicks Lake House.

To allow all species of weed growth to be up and ready for treatment, Natureworks stated they would be approximately four weeks out from June 21 to be ready for treatment. Treatment cannot be scheduled weeks or months in advance due to changing conditions within the lake as well as weather. Natureworks posts treatment notices as close to the week prior to treatment as possible.  

Moving forward, discussions regarding additional floating weed management will be conducted and a plan will be discussed. Following previous treatments, floating boggs developed, so methods to address this in the future will be evaluated.  Efforts to keep the upper end (cove) of Split Rock clear were discussed.

We now know treatment occurred on July 13, 2022 from 4-8:00 pm.  We had terrific compliance too, thank you everyone for discontinuing boating and lake activities until the following morning.

Read more about Natureworks on their website:  www.natureworkscwa.com.


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