Silver Lake 2023 Annual Report Summary
Project Overview
Silver Lake experienced significantly lower nutrient levels in 2023, largely due to the implementation of TimberChar™ filters in lake drains and on docks and boats. This reduction has led to improved water clarity and aquatic plant regrowth.
Biochar Efficacy
- Installed TimberChar™ filters in key drain areas.
- Reduced total phosphorus (TP) and total suspended solids (TSS).
- Positive impact on nitrogen forms like ammonia across multiple drain sites.
Water Quality Improvements
- Mean TP concentration was 0.021 mg/L, below eutrophic threshold.
- Dissolved oxygen remained favorable (mean ~6.9 mg/L).
- Conductivity and pH stayed within ideal ranges.
- Chlorophyll-a levels (~4.7 µg/L) suggest moderate algal activity.
Aquatic Vegetation
- 8 native aquatic species identified in June 2023.
- Chara and Bulrushes were the most abundant.
- Invasive species like Eurasian Watermilfoil and Curly-leaf Pondweed were present but minimal.
- Overall increase in plant biovolume, supporting better fish habitat.
Management Recommendations (2024)
- Continue aquatic vegetation surveys and annual carp culls.
- Consider native aquatic plantings if clarity continues improving.
- Promote shoreline plant buffers and septic system improvements.
- Host educational workshops focused on non-point source pollution and riparian BMPs.
Key Findings:
1. TimberChar™ Significantly Reduced Nutrient Loads
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Total Phosphorus (TP):
Post-TimberChar™ monitoring showed consistent declines in TP across all measured drain sites.-
At Hunter Creek, TP levels dropped from 0.042 mg/L to 0.014 mg/L.
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In Dunes Vista, the reduction was even greater: from 0.239 mg/L to 0.047 mg/L.
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Total Suspended Solids (TSS):
TSS levels also fell substantially, improving water clarity and reducing sediment-related nutrient cycling.-
State Park drain improved from 69 mg/L to 11.5 mg/L.
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Ammonia and Inorganic Nitrogen:
Ammonia and nitrate concentrations were significantly reduced at all drain sites, limiting fuel for algal blooms and supporting improved ecosystem function.
2. Improved Water Clarity, but Still a Work in Progress
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Mean Secchi transparency readings in 2023 ranged between 3.5 to 3.9 feet, an improvement from 2022, but still below the 7.0-foot target needed to promote widespread aquatic plant germination.
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Continued reductions in suspended solids and nutrients are expected to improve clarity in future seasons.
3. Water Quality Metrics Trending Favorably
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Total Phosphorus (TP):
The lake-wide mean concentration dropped to 0.021 mg/L, a favorable shift that brings TP below the eutrophic threshold. -
Chlorophyll-a:
Concentrations averaged 4.7 µg/L, indicating moderate algae levels. While still somewhat elevated, this represents stability compared to prior years. -
pH and Conductivity:
Both remained within ideal ranges. pH values ranged from 8.2 to 8.6, reflecting a slightly basic and stable aquatic environment.
4. Aquatic Plant Growth on the Rise
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A total of 8 native aquatic species were recorded during the 2023 survey, including Muskgrass (Chara vulgaris) and Bulrushes (Scirpus acutus).
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These species provide essential fish habitat and help stabilize sediments. The increase in vegetation reflects improving lake conditions and reduced algal competition.
5. Invasive Species Present but Controlled
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Eurasian Watermilfoil and Curly-leaf Pondweed were detected at low abundance levels across scattered locations.
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No herbicide treatments were deemed necessary in 2023. Management recommendations follow MDNR guidance to preserve some vegetative cover unless invasive species become ecologically disruptive.
6. Enhanced Monitoring of Drain Flows and Impacts
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Flow rate data (in cubic feet per second) was collected at major inflow sites, including Hunter Creek and State Park.
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These data will be critical for calculating nutrient loading rates in 2024 and targeting future TimberChar™ deployment more effectively.
Conclusion:
The 2023 season marked significant progress in nutrient reduction and lake health. Continued implementation of Biochar, public education, and management practices are key to Silver Lake’s long-term restoration.
FAQ
PrO2 injects dissolved oxygen directly into the water column without disturbing sediment, targeting deep zones where low oxygen contributes to algae and bacteria problems.
Improved oxygen levels reduce internal phosphorus release and slow algae growth, often resulting in visibly clearer water and healthier ecosystems within 1–2 seasons.
Yes. It’s a quiet, chemical-free solution that operates safely in recreational lakes, parks, and residential developments.
Yes. It’s designed for continuous operation and adapts to temperature changes common in Michigan, Indiana, and Ohio.
Yes. Improved oxygen levels prevent fish stress and reduce anaerobic bacteria activity that causes foul smells and poor water quality.
Want to explore how this applies to your lake association?
Let’s talk about sustainable solutions that save money and boost performance.
- Location: Silver Lake, Michigan
- Prepared by: Restorative Lake Sciences (RLS)