Copper Sulfate will be applied to Kinderhook Lake
for algae control on
Monday morning, June 15, 2026
See the FAQ page for information and warnings
See the FAQ page for information and warnings
Time again to support the many programs that help keep Kinderhook Lake a beautiful community resource by purchasing a KLC membership and making donations to our dedicated funds. At the same time, you pick up your membership poster, launch gate key, and car/trailer sticker; no waiting for them to arrive by snail mail. KLC Directors will be available to answer your questions, plus KLC logo merchandise will be available on both days.
Of primary importance this year is the ProcellaCor Fundraiser for the treatment of invasive Eurasian milfoil. We’ve been almost milfoil-free for five summers since treating the lake with ProcellaCor in 2021 – and it’s time for a new treatment. Thanks to the generosity of our supporters, we’ve already raised over $74,000 and reached ~59% of our $125,000 fundraising goal. But we need approximately $51,000 more for a full treatment – partial treatments are not an effective option. Donations to the Weed Management Fund will help us continue this essential work and ensure a cleaner, healthier lake for everyone to enjoy.
The seasonal lake refill is scheduled to begin on Saturday, April 4, 2026. The flashboards will be added on top of the main spillway and the sluice gate will be closed in accordance with our DEC permit.
With lake levels currently reduced, this is your final opportunity to complete any dock installation, waterfront repairs, or shoreline work before rising water makes access difficult or impossible. Lakefront property owners are encouraged to make full use of this weekend (March 29–30) and the week of March 31–April 3 to finish all necessary work.
Please ensure all equipment, materials, and personnel are off the lakebed before the refill begins on April 4. The rate at which the lake reaches summer level will depend, as always, on rainfall and remaining snowmelt in our watershed.
As the year comes to an end, we invite you to make a lasting impact on our community and enjoy potential tax benefits. Your donation to the Weed Management Fund will directly support our efforts to treat all Eurasian milfoil in the lake with ProcellaCor next summer.
Thanks to the generosity of supporters like you, we’ve already raised over $40,000 and reached ~32% of our fundraising goal. With your help, we can continue this essential work and ensure a cleaner, healthier lake for everyone to enjoy.
Every contribution brings us closer to our target. Please consider making your year-end gift today. Together, we can maintain the beauty and recreational value of our lake.
Click HERE to make your donation now or mail a check to KLC, PO Box 53, Niverville, NY 12130.
Thank you for your continued support! 
This post is an update of two important projects that will significantly impact the immediate future of Kinderhook Lake.
First, the KLC Board of Directors has awarded a $165,000 contract to Keller Construction for essential repair work at the Nivers Dam. Engineering inspections found weather and water related concrete deterioration and joint cracks on the primary and secondary spillways. Repairs are already in progress and will replace deteriorated concrete with new rebar and concrete to reinforce the structure. This project is being funded by the Dam Reserve Fund and General Funds; no additional funding is requested from members at this time to complete the dam repair project. Progress photos can be found on the Gallery Page.
Second — and equally important — the Board has accepted a proposal from Burden Aquatics of Averill Park, NY, to obtain DEC permits and treat approximately 140 acres of Eurasian milfoil with ProcellaCor in 2026. This is a major step forward in protecting our lake’s health. If you’ve been on the lake this summer, you’ve seen it — milfoil breaking the surface in coves, boating channels, and much of the shoreline. Left untreated, it quickly forms dense mats that starve native plants of needed sunlight and oxygen, thus making fishing, boating, swimming, and other recreational activities difficult or impossible – just as we saw in the summers of 2019 and 2020.
Our goal is to raise $125,000 to cover the cost of permitting, preparation, and treatment. We’ve already received over $30,000 in early donations, and we’re now launching our ProcellaCor Fundraising Campaign to raise the remaining $95,000 by next summer. The 2021 ProcellaCor treatment kept the lake clear and healthy for an exceptional five years (longer than the typical estimate of about three years). Unfortunately, the milfoil has returned aggressively, and the most efficient, cost-effective, and environmentally responsible way to prevent it from taking over again is through this next ProcellaCor treatment. See FAQs below for more information.
The Kinderhook Lake Corporation is the only organization responsible for maintaining both the dam and the lake’s ecosystem. We receive no funding from other organizations or town, county, or state agencies — the lake is sustained entirely by your donations and volunteer efforts.
Please help us meet this goal by contributing to the Weed Management Fund today — every donation makes a difference. You can donate securely using the Online Membership and Donation Form, or mail your contribution to Kinderhook Lake Corporation, P.O. Box 53, Niverville, NY 12130. KLC is a 501(c)(3) non-profit organization; your donations may be tax-deductible.
Thank you for helping protect the lake we all enjoy.
With appreciation,
The KLC Board of Directors
Frequently Asked Questions
Q1: Why not just treat partial areas of the lake to save money?
A1: Because milfoil spreads quickly through fragmentation (any small pieces of the plant). Boat propellers and watercraft traveling through remaining milfoil beds create fragments that easily start new growth elsewhere around the lake. Treating isolated patches doesn’t stop the milfoil — it simply regrows and spreads around the lake within a season.
Q2: How long will the ProcellaCor treatment last?
A2: The treatment warranty is for ~90% effective control for up to three years. However, based on our experience from the 2021 treatment, we expect four to five years of effective control, depending on weather, nutrient runoff, and new plant introduction.
Q3: Can the town or state help with funding?
A3: The KLC has approached both the Town and the State in the past for potential support and will continue to do so. We are pursuing avenues for specific grants related to the control of invasive species, a statewide concern. There is no guarantee of our success.
Q4: Do we need a DEC permit to treat the lake with ProcellaCor?
A4: Yes. We operate under strict DEC regulations that control the quantity, location, and methods of how herbicides can be applied, and we work to secure the maximum allowable treatment to ensure the best possible results for the entire lake.
Q5: How does ProcellaCor work to control milfoil?
A5: When applied during milfoil’s active growth phase, ProcellaCor is efficiently absorbed throughout the plant, including roots and shoots, ensuring complete eradication and preventing regrowth from fragments. ProcellaCor’s low dosage and rapid environmental breakdown reduces risks to water quality and non-target plants and organisms.
This is an early reminder that on Wednesday, October 15th, the KLC will begin the annual lake drawdown in accordance with our DEC permit. The purpose of the drawdown is to protect shoreline areas and docks from winter ice damage. We recommend that any shoreline maintenance projects be planned for this fall, as the water level can rise quickly in the spring depending on rain, ice, and snowmelt. Please plan accordingly.
See the FAQ page for information and warnings
This will be the final Copper Sulfate treatment of the 2025 season
See the FAQ page for information and warnings

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