posted Aug 11, 2016, 6:42 PM by Lake Iroquois Association   [ updated Aug 11, 2016, 6:48 PM ]

The boat is in and the milfoil is coming out!

On Monday, August 8, AB Aquatics, the company the Lake Iroquois Association (LIA) has contracted to do this work, began Diver-Assisted Suction Harvesting (DASH) of milfoil on Lake Iroquois.  They are working to clear the channel at the fishing access so that boats entering the lake will not break up the milfoil thereby spreading it further into the lake.  AB Aquatics will be working on the lake for at least two weeks.

If you are out on the lake, wave to the crew but please keep your distance.  The crew asks that you not try to talk with them while they are working.  They can't really hear you very well and for safety reasons they need to stay focused on the work.  Remember also that there is a diver submerged working near the boat so make sure to maintain a 200 foot distance.   However, if you would like to talk with the crew they expect to be unloading at the fishing access around 2:30 or 3 in the afternoon. 

This method will not completely solve the milfoil problem.  Rather it is a part of a many pronged effort to reduce and manage this invasive.  Among the other activities aimed at enhancing and maintaining the health of Lake Iroquois are our Greeter Program in which boats entering and leaving the lake are checked for invasives and cleaned, if necessary; projects to reduce nutrients entering the lake (which feeds the growth of milfoil) by mitigating nutrient-laden runoff;  education of lakeshore property owners and lake users in best management practices; creation of no-mow zones and riparian buffers to prevent nutrient runoff into the lake; and  monitoring and stream remediation to reduce sediment and nutrients carried into the lake via its tributaries.  Most of all, your help and support  (financial and/or volunteering time)  will make a difference in protecting and enhancing this wonderful resource.  

For more information, like us on Facebook,  or email us at 

What is Diver-Assisted Suction Harvesting?

Diver-Assisted Suction Harvesting (DASH) is an effective method of removal of invasives.  A diver physically hand pulls the targeted plant, being careful to remove the entire root system and to minimize fragmentation (milfoil fragments can easily root and spread throughout a waterbody).  They then place the plant into a suction hose that takes the plant to the surface. Once at the surface the plant is discharged into a straining basket (sort of like a colander) set into the deck so that sediment and water flows through and the milfoil is captured. One crew member on the boat then puts the plants into bags while the second crew member on the boat maps the area being cleared with an Ipad and maintains voice communication with the submerged diver.  At the end of the day the bags with the plants are emptied away from the lake where the material can be composted.

DASH boat, milfoil being removed on Lake Iroquois.

AB Aquatics CEO, Bob Patterson, (left) and the DASH boat crew at Lake Iroquois.

Lake Iroquois Association,
Aug 11, 2016, 6:42 PM