HORSESHOE LAKE IMPROVEMENT ASSOCIATION: Horseshoe Lake Improvement Assoc., Rapid Response Program

Purpose

Horseshoe Lake Improvement Association is sponsoring an Aquatic Invasive Species Rapid Response grant which will focus on physical removal of hybrid Eurasian Water Milfoil plants from Horseshoe Lake by scuba divers (professional and resident) and may include some small-scale chemical treatment (subject to DNR approval and permits) in fall 2007, 2008, and early season 2009. A full lake point-intercept plant survey will be completed in 2008. Project activities include: 1) physical removal by scuba divers, 2007-2009 2) pre- and post- treatment surveying 3) small-scale chemical application (currently set at 3.5 acres or less in 2008, with the potential for a small-scale application in Fall of 2007) 4) full lake point-intercept aquatic plant survey 5) marker buoys and improved public access signage to education lake users about the hybrid EWM and to designate problem locations in the lake to minimize spread Project deliverables include: 1) all current and future reports related to surveying completed, diving results, point-intercept plant survey, chemical application, and a final report describing overall findings, work completed, results, and guidance for continued control actions; all in digital format. Special conditions for this project: - all chemical application must be permitted and approved by DNR; - final report needs department review and approval

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Aquatic Invasives Grant
Aquatic Invasives Early Detection and Response
AIRR-029-08
2007
Complete
 
Reports and Documents
In 2006, the Wisconsin Department of Natural Resources identified the presence of Hybrid water milfoil (HWM) – a cross between Northern and Eurasian water milfoils (Myriophyllum sibiricum X Myriophyllum spicatum) in the lake. Because of this finding, the Horseshoe Lake Improvement Association commissioned an exotic species rapid assessment point intercept survey in June 2007 to determine the distribution and density of HWM. In 2008, two full point/intercept surveys and a fall bed mapping survey of HWM were requested to provide the baseline data needed to develop an Aquatic Plant Management Plan (APMP) for the lake. This survey is a follow up to the 2008 Bed Mapping Survey. The goals of the survey were to provide an estimate of total HWM acreage on the lake, to determine the effectiveness of 2009 control methods and to assist in developing control strategies for 2010.
In 2008, the WDNR and the Horseshoe Lake Improvement Association commissioned a cold-water exotic species survey, systematic point/intercept macrophyte survey, and fall Hybrid water milfoil bed mapping survey in preparation for developing an Aquatic Plant Management Plan for the lake. The full point intercept survey found macrophytes at 325 of the 515 total survey sites. We identified a total of 51 native plant species including five Wisconsin Special Concern Species (Spiny hornwort, Robbins spikerush, Farwell’s water milfoil, Filament-leaf pondweed, and Vasey’s pondweed) in and directly adjacent to the lake.
Horseshoe Lake (WBIC 2630100) is a 398 acre, mesotrophic, stratified, seepage lake located on the border of Polk and Barron Counties in northwest Wisconsin. In 2006, the Wisconsin Department of Natural Resources identified the presence of Hybrid water milfoil – a cross between Northern and Eurasian water milfoils (Myriophyllum sibiricum X Myriophyllum spicatum) in the lake. Because of this finding, the Horseshoe Lake Improvement Association commissioned an exotic species point intercept survey to determine the extent of infestation in the lake in preparation for the possibility of applying for a rapid response grant.
 
Activities & Recommendations
APM Chemical Permit Request
Grant Awarded
AIRR-029-08
Grant Awarded
AIRR-029-08Horseshoe Lake Improvement Assoc., Rapid Response Program
Educate and engage residents
19294306
Control Invasive Species
Monitor Pre and Post Treatment
 
Watershed
 
Waters