The Rideau Valley Conservation Authority says that warm temperatures and rain could cause water levels to threaten access to lower lying communities.
The warning applies particularly to Hilly Lane, Cedar Beach and Rideau Glen and other that are susceptible to flooding.
The Hilly Lane community could start to have water encroaching on the access road by tomorrow as a result of above zero temperatures melting the remaining snow and a two-day total rainfall of as much as 20 millimetres.
The conservation authority says safety is the priority.
The fluctuating water levels and temperatures will cause ice to weaken on all watercourses. Parents are urged to remind their children about the dangers of playing on or near ice covered surfaces or fast flowing water in ditches and smaller creeks.
All watershed residents are advised to stay off of the ice on rivers and streams and avoid icy or wet streambanks where footing can be treacherous.