Invasive Species Action Center, Portage Lake Watershed Forever

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MONTHLY REPORTS 2011:
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MONTHLY REPORTS 2010: August | September | October | November | December

Portage Lake was treated for eurasian watermilfoil (ewm) on September 15th 2009 and for phragmites australis on September 25th, 2009. In a little over a year, the Onekama Community passed an Invasive Species Resolution, a Phragmites Ordinance, formed a Special Assessment District and applied for and received a small grant. A 5 year management plan was developed for treating invasives and protecting our environment. Surveys of invasives and baseline water quality monitoring data for the lake, streams and storm drains were collected in preparation for these treatments. 162 acres of ewm were treated by Professional Lake Management and 83 acres of phragmites were treated by Aquatic Services Inc. in 2009 with much success.

In the spring of 2010, 22 acres of ewm were found and they were treated on June 29th. 64 acres were discovered later in the season. These were treated on September 27th. Less than 10 acres of Phragmites were treated in the fall of 2010. Other areas in Onekama Township where phragmites was found were also treated and this included areas on the Lake Michigan shoreline.

The results of the aquatic vegetative surveys in 2011 presented us with new challenges. Although only 22 acres of ewm were treated, we did verify that we have hybrid ewm and it is growing at depths of 20 feet. The hybrid species and the deeper depth will require a new method of application in 2012 and perhaps different chemicals. The Invasives Species Committee is working with the DEQ to design an Evaluation Study for the 2012 treatment. This will require the collection of extensive data prior to treatment.

We treated about 6 acres of phragmites in 2011 and expect to be able to spot treat any newly identified stands each year. We have also identified purple loosestrife, japanese knotweed, blue lyme grass, thin leaf cattails and other invasives that may need to be treated before they become a threat to our lake.

Phragmites Video courtesy of Beaver Island, Peaine Township

A demonstration project behind Farr Center was done in the Fall of 2008 to spray and subsequently burn a large stand of phragmites. It showed that we can pretty much wipe out phragmites if we have a sustained program and remain constantly alert to what is happening in and around our lake.

The invasive species committee recently addressed questions on how the aquatic herbicide treatments might affect the Portage Lake Fishery.

The invasive species committee recently addressed questions on how the aquatic herbicide treatments might affect the Portage Lake Fishery.

Treating Lake Portage

Newsletters

Timelines

Safety

Resolutions & Ordinances

  • On file in the Township Office
   
 

Related Links:

USDA Invasive Aquatic Species

Phragmites.Org - Harsens Island Project

Charlevoix Conservation District Phragmites Page










   

Marigolds are blooming on the lakeside!

Marsh marigolds are blooming on the lake side of the Farr Center! How exciting that without the phragmites they are coming back! This picture of a beautiful native plant, the marsh marigold, supports that the chemicals used did not kill the native plants, but instead made room for them to grow again.

 

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OTHER RESOURCES:

Phragmites Brochure


Portage Lake
Invasive Species FAQ #1

Portage Lake Invasive Species FAQ #2

Portage Lake Invasive Species FAQ #3 (includes Special Assessment District)

Portage Lake Management Plan Report 2012

Portage Lake Management Plan Report 2010

Portage Lake Management Plan Report 2009

Appendix to Report

Website Developed by the Portage Lake Association