Nilan Reservoir Eurasian Watermilfoil Control Project, Draft EA
Oct 29, 2021 10:29 AM
FWP will initiate control of Eurasian watermilfoil (EWM) (Myriophyllum spicatum) with the goal to eradicate this newly discovered population. This is a highly invasive aquatic plant and this is the first detection of EWM in this basin. Montana has limited populations of this species so management of this species and population is prudent to prevent further spread into other nearby waters.
EWM has the potential to outcompete native aquatic plant species, negatively impact recreation access and opportunities, and have negative economic impacts on irrigation and agriculture activities. This is a small population and as such is best to work to control it before it spreads throughout the reservoir and into nearby waters including irrigation ditches. The historic low reservoir levels make it an ideal time to treat since it will reduce the amount of chemical needed, costs, and potential impacts to the physical and human environment.
Application of the herbicide would occur in the small bay between the two FWP boat ramps. The reservoir is at historic low levels so the amount of water that will need to be treated is very limited. It is estimated that 1.15 acres of Eurasian watermilfoil exist with a current average depth of 3 to 4 feet.
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Public Comment Opportunity
Deadline: Written comments will be accepted until 5:00 p.m., November 8, 2021
Email to: FWPfishcomments@mt.gov
Or mail to:
MT Fish, Wildlife, & Parks
Attn: Craig McLane
P.O. Box 200701
Helena, MT 59620-0701