LONG LAKE PROT & REHAB DIST: Long Lake Curly Leaf Pond Weed Control - 2 Year Project


Long Lake P&R District is sponsoring a 2-yr project to implement approved activities from the Long Lake Aquatic Plant Management Plan. Project deliverables include GIS data & maps of areas monitored, aquatic plant & turion monitoring results, examples of AIS education & outreach, AIS monitoring & watercraft inspection data in SWIMS, management/treatment summaries. Specific project activities include: 1) Curly-leaf pondweed chemical & manual control; 2) Pre-post treatment aquatic plant monitoring; 3) Turion monitoring; 4) Planting native aquatic plants; 5) Watercraft inspections; 6) AIS education & monitoring. Special Conditions: 1) WDNR\2019s Aquatic Plant Management in Wisconsin guidance shall be followed for aquatic plant monitoring; 2) Sponsor shall contact DNR immediately if a new AIS is found; 3) AIS monitoring and watercraft inspection personnel shall be trained and follow DNR approved protocols. This scope summarizes the project detail provided in the application and does not negate tasks/deliverables described therein. Data, records, and reports, including GIS-based maps, and digital images, must be submitted to the Department in a format specified by the regional Lakes Biologist.

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Reports and Documents
Long Lake (WBIC 2478200) is a 272 acre eutrophic seepage lake located in central Polk County, WI. In 2010, the Long Lake Protection and Rehabilitation District, under the direction of Harmony Environmental, developed an Aquatic Plant Management Plan that authorized chemical treatment of the lake’s Curly-leaf pondweed (Potamogeton crispus) infestation. As a prerequisite to updating this plan in 2017 and to compare how the lake’s vegetation had changed since the last point-intercept surveys in 2012, the LLPRD and the Wisconsin Department of Natural Resources authorized CLP density and bed mapping surveys on June 11th, and a full point-intercept survey for all aquatic macrophytes from July 23-24, 2016.
On 28 May 2013, a number of areas totaling 26.6 acres were treated with a liquid formulation of endothall (Aquathol K) to control curly-leaf pondweed (Potamogeton crispus). The endothall was applied at a target concentration of 2000 ug/L (2.0 mg/L) active ingredient (ai) to treatment area 1, and 2500 ug/L ai (2.5 mg/L ai) to the remaining treatment areas. Endothall application rates are specified as active ingredient (ai) in the product label, while endothall chemical analysis is specified as acid equivalent (ae). A concentration of 2000 ug/L ai is equal to 1420 ug/L ae and 2500 ug/L ai is equal to 1774 ug/L ae
Initial expectations were to treat six beds totaling 49.88 (Table 1). Following the pretreatment survey, it was decided to trim all beds inward and completely eliminate treatment in Bed 7 as these areas had little or no CLP present. This reduction of 23.28 acres represented a nearly 53% decline from initial expectations.Treatment occurred on May 28th, 2013 with Northern Aquatics (Dresser, WI) applying Aquathol K (Endothall) at a rate of 2.0-2.5 ppm (252.4 total gallons). The reported water temperatures at the time of treatment were 58.0°F which was within the recommended treatment temperature range of 50 - 60°F. Wind speeds were reported to be 0-4mph.
Activities & Recommendations
Information and Education
APM Chemical Permit Request
APM Mechanical Permit Request
Grant Awarded
Watercraft Inspections Clean Boats, Clean Waters
Project Deliverable
Aquatic plant and turion monitoring results
Project Deliverable
management and treatment summaries
Map Invasive Species
GIS maps and data of monitored areas
Aquatic Plant Monitoring or Survey
Monitor Pre and Post Treatment