Many thanks to the Door County Invasive Species Team (DCIST) and their coordinator for supporting all of our invasive species prevention efforts. DCIST coordinator is Jason Miller, he can be reached by leaving a message at 920-746-5955 or using the DCIST e-mail dcist1@gmail.com
Samantha has her office at Door County Soil and Water at 421 Nebraska St. Sturgeon Bay 920-746-2214.
Phragmites : 2023 update. The 2023 map below now also includes photos of each site.
Phragmites has been treated on Clark Lake for many years. Clark Lake Advancement Association (CLAA) volunteers treated the shore and contiguous land as part of our routine programs. Beginning in 2022 the county received grant and will treat all areas. We will still do a survey and map phragmites locations that will be shared with the county for their contracted agent to treat.
Treatment should be done when the herbicide will be translocated from the leaves and stalk into the roots. Therefore treatment should occur from the end of August to the middle of September.
A DNR permit is required for treatment near the shore and wetlands. The permit requires the GPS location and estimated area of each treatment site. Since the permit processing can take a few weeks, the survey and mapping are done later in July.
Owners should be notified by the permit holder or their agent about planned treatments. Warning signs are posted at treated sites for 24 hours which is when the herbicide should have been dissipated.
2023 Survey identified 11 sites on 10 properties.
Of the 6 2022 treated sites, 3 were cleared
6 of the untreated sites were unchanged but 1 site which had 1 or 2 plants in 2022 did not have any this year.
2 new sites were identified.
Additional sites inland NE of the lake are identified on the DCIST map. These are on properties not included in the routine CLAA survey.
One new site is dense but confined to a single patch on a property prior treated on other areas.
The other new CLAA site is inland on an area not previously checked but near other inland areas identified and already partially treated by the county.
There continue to be areas near shore that are difficult to access and their status is unknown.
In 2022 plants along the shore are still sporadic. Two new inland patches were identified, one along North Cave Point Drive and the other at the north end of Trails End Court. The large patch off Clark Lake Court continue to improve both in area and density of plants but still requires alot of attention.
2019 identified several new near shore patches. Most were along N Cave Point Drive and by 2022 only a few sporadic plants remain. Another patch adjoining the swimming beach is shrinking but in 2022 still needs attention to the original site and surrounding locations.
eIn 2018 we did find a new, moderately dense, patch along the southeast shore that involved three properties. In 2019 only a single plant was left. Three plants on one property were again found here in 2022.
h2015 a large , dense patch was found on the shore and extending inland to Clark Lake Court. Efforts near the shore were quite successful and now, 2022, the inland plants are reduced in both area and density but wills till require alot of treatment.
TThe moderately dense patch in the marsh/ bog on the north east portion of the lake is now reduced to scattered sporadic plants. This area was treated by the Ridges grant in 2015-2018 . In 2021 three of these areas were now replaced by native phragmites that do not need treatment.
You can explore the maps below and see the distribution and density of phragmites over the last several years.