The strength of ice on retention ponds and rivers is questionable because of several factors, including constant water level changes, daily temperature changes, and water flowing under ice. Agitation pumps placed in ponds can weaken the ice above as well. Snow on top of these bodies of water will cover up any obvious signs of weak ice and create a false sense of security. The recommendation is that any ice less than 4 inches thick should not be walked on.
An unkept retention pond is designed to fail, so regular inspections and removal of debris or sediment is a must. These bodies of water also bring liability concerns such as drowning, require continuous maintenance and planning, and can be very expensive to maintain. Swimming, fishing, skating or other activities on or in the pond should not be allowed under any circumstances.
Prevent severe accidents by reminding citizens and workers of these hazards. Posting signage that warns everyone to stay off the body of water due to unsafe ice and including reminders of who to contact in emergency could potentially save a life. In November, a nine-year-old boy in Illinois fell through the ice while retrieving a football. A woman who saw the accident entered the pond in attempt to save him, and they both almost drowned before police were able to rescue them. If it weren’t for a witness who called police, there easily could have been a different outcome to this story.
Other References:
Valley News Live - Residents reminded to stay off iced over retention ponds and Sheyenne River
Spectrum Association Management - What is a retention pond?
City of Jacksonville, FL - Retention Pond Safety
Submitted by: Michael Neff, Loss Control Consultant
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