Recent satellite imagery, dated Aug. 13, has revealed increased levels of cyanobacteria coverage across all areas of Indian Lake. (Ohio EPA graphic)
The number of potentially harmful toxins in the waters of Indian Lake have increased dramatically in recent weeks, satellite imagery has shown.
The Logan County Health District has been utilizing experimental satellite imagery provided by the Ohio Department of Health to monitor Indian Lake in recent months.
The efforts are intended to raise awareness about the presence of cyanobacteria, microorganisms capable of producing Harmful Algal Blooms (HABs), which can have detrimental effects on both humans and aquatic ecosystems.
Recent satellite imagery, dated Aug. 13, has revealed concerning levels of cyanobacteria coverage across all areas of Indian Lake. The imagery estimates that more than half of the lake is affected by cyanobacteria, and there has been a noticeable increase in their density.
A previous satellite image taken on June 18, also indicated cyanobacteria coverage, affecting approximately 10 to 50 percent of the lake. In the June satellite image, low-to-medium levels of cyanobacteria were detected in portions of the northwestern edge of the lake.
The August image registers high levels across the entire body of water.
It’s worth noting that satellite imagery previously suggested possible HABs during the summers of 2021 and 2022. However, no instances of animal or human illnesses linked to these blooms were reported to the Logan County Health District.
The Ohio Department of Natural Resources continues to monitor the situation as well, and recently posted an update to its website.
A survey conducted by Restorative Lake Sciences the week of July 17, led by Dr. Jennifer L. Jermalowicz-Jones, highlighted the effectiveness of 2023 herbicide treatments in targeting invasive species like Eurasian Watermilfoil. Ample growth of native plants and favorable Dissolved Oxygen (DO) concentrations were noted.
Based on these findings, Dr. Jones’ recommendations for the remainder of 2023 include abstaining from additional herbicide treatments, preserving growing native plants, closely monitoring harmful algal blooms and considering nutrient removal elements on tributaries.
Acting on these insights, ODNR has decided against further herbicide treatments. Focus will shift to removing deceased plant matter and maintaining navigation lanes within lily pad areas.
Dr. Jones assured that Indian Lake has witnessed substantial improvements since 2022, and as long as toxin concentrations remain low, it stands as a safe destination for all recreational activities.
Harmful Algal Blooms are known to pose significant health risks to both animals and humans. The most common methods of exposure include ingestion, skin contact, and inhalation.
Drinking or swallowing water contaminated by HABs can lead to severe symptoms such as diarrhea, vomiting, liver and kidney toxicity, neurotoxicity, breathing difficulties, and even death. Skin contact can result in rashes, hives, and blisters, especially around the lips and under swimsuits. Inhaling HABs-contaminated water may cause respiratory issues, sore throat, and asthma-like symptoms.
In case of poisoning due to HAB toxins or a medical emergency, seeking immediate medical attention is strongly advised. The Logan County Health District can be reached at (937) 592-9040 or through email at LCHD. HAB illnesses are considered reportable, and anyone suspecting an illness is encouraged to contact the health district.