↑ Return to Minerva Lake


Map Info:
Colored areas indicate areas of plant growth. Red indicates high density, Pink moderate density, Individual Dots represent individual plants or small clusters.


This year was a big step in reducing efforts on Minerva Lake. Work was performed for a total of four weeks by a two-diver crew. A total of 47 bags (1,175 lbs) were harvested. Yet again we saw a major decrease in milfoil presence on the lake. It is a point of pride for AIM that the lake that formed our company has such minimal milfoil growth. In 2011, we plan to use a two diver crew for only 2 weeks as we continue reducing necessary manpower to control a suppressed infestation.


AIM came back to Minerva again in 2009 with a two diver and one top-water crew for a total of six weeks. The crew found minimal growth in the northern bay and instead encountered heavier growth along the western shore. All known affected areas were covered by the dive team and a total of 146 bags were harvested (3,650 lbs). AIM plans to continue stepping down the size and cost of the effort in 2010. Minerva Lake is now in the maintenance phase where the initial crisis of overgrown milfoil has been averted and now a steady and consistent control program needs to persist to keep the growth from recovering.


AIM returned to Minerva with a four diver crew in 2008 with the goal of covering all affected areas. The crew started in the northern bay where the effectiveness of the 2007 effort became apparent. The growth in what was originally the densest bed in the bay was easily removed. Many new growth areas were located all around the lake, evidence of the success of the plant’s fragmentation strategy. The crew was able to harvest and re-harvest all priority areas while also covering all potential growth locations. In the end, we knew we had reigned in what was going to become a major milfoil infestation if left unchecked. The shallow, fertile lake would have been easily overrun by the plant.


AIM was formed in August of 2007 in order to work on Minerva Lake. The effort consisted of 8 days with four divers and our focus was on the northern bay of the lake. An extremely dense bed of Eurasian milfoil had become established there and was rapidly spreading around the shoreline. Our concern was the fragmentation. Minerva Lake is shallow and extremely nutrient rich, making it a perfect candidate for serious milfoil growth. Any fragment that landed in the sediment there would have little trouble producing a healthy plant.

We placed roughly 20 benthic mats over dense areas of growth and then waded into the hand harvesting phase. We would quickly fill rowboat after rowboat with huge, multi-stemmed plants. In the end we felt that we had made a sizable dent in the existing bed, but we knew there was much more to be done.