Treasure Cove Home Owner's Association, Inc. consist of 23 Channel front homes and lots connected to Grand Lake St. Mary’s which is located one mile north of Montezuma at the corner of Coldwater Beach Rd and St. Rt. 219 Celina Ohio Mercer Couny. The Greater Grand Lake St. Mary’s Region is bordered by the Cities of Celina and St. Mary’s in Mercer and Auglaize Counties.

September 3, 2010 - Good Friday Evening Everyone, Just a quick update before this GREAT Labor Day weekend. This weeks microcystin toxin results were some of the lowest we have seen in some time with results ranging from 1.5 to 7.5. The issue we are still faced with is the "anatoxin a" which also was the lowest we have seen in some time ranging from 0.1 to 0.3. That being said the advisory will stay the same for the weekend - "NOTICE - An algae bloom has made this area potentially unsafe for water contact. Avoid direct contact with the water."


Removing your boat from HAB-contaminated water:
Please note that the risk from exposure to toxins from removing your boat from HAB-contaminated water is minimal.  However, to reduce any potential exposure to HAB-contaminated waters after removing a boat, ODH suggests the following preventative measures:

  • Wear protective-waterproof gloves.
  • Drain the water in your holding tank.
  • Drain the water from your boat motor.
  • Gently wash/rinse the boat with clean, non-contaminated lake water. 
  • If a high-pressure wash is going to be used, we recommend letting the boat sit in the direct sun for a couple of hours so water can run off and/or evaporate.  As cyanobacteria toxins quickly break down in the air and sunlight, this will allow an opportunity to reduce the toxins potentially being aerosolized. 
  • If people have direct dermal (skin) contact with HAB-contaminated lake water, thoroughly rinse all impacted areas with clean, non-contaminated water.
  • If clothing becomes wet with HAB-contaminated lake water, replace with dry clothing.  Contaminated clothing can be cleaned in a household washer and dryer.

Community Meeting September 7th. Click Here for Details