Spring has arrived fast this year, perhaps too fast. The Raisin Region Conservation Authority (RRCA) issued a flood warning Wednesday afternoon for Cornwall and surrounding municipalities in Eastern Ontario, as above-zero temperatures combine with heavy rainfall to push local creeks and waterways to their limits.
The warning covers the City of Cornwall and parts of North and South Stormont, North and South Glengarry, a broad swath of Eastern Ontario southeast of Ottawa. Conservation officials say creeks are already approaching "bank full conditions," with flooding described as imminent or already occurring in some areas.
What's Driving the Flooding
The culprit is a classic early-spring double punch: a rapid thaw combined with significant rainfall. An additional 30mm of rain was expected to fall overnight into Thursday, layering on top of the snowmelt already saturating the ground and filling waterways.
Low-lying roads, farm lanes, and driveways near rivers and creeks are at the highest risk. Residents in affected areas are being advised to stay away from flood-prone zones and avoid driving through standing water on roads.
Multiple Conservation Authorities on Alert
The RRCA wasn't the only organization sounding the alarm. Four other Eastern Ontario conservation authorities also issued flood watches Wednesday:
- Rideau Valley Conservation Authority
- Mississippi Valley Conservation Authority
- Cataraqui Region Conservation Authority
- South Nation Conservation Authority
The Rideau Valley CA's alert is particularly relevant for Ottawa residents, as the Rideau watershed covers the southern and eastern edges of the city.
What Ottawa Residents Should Know
If you live near the Rideau River, Jock River, or any of their tributaries, it's worth keeping an eye on water levels over the next 24-48 hours. City of Ottawa and Conservation Authority websites will have updated flood watch information as conditions evolve.
Flooding is a regular feature of Ottawa springs, though the speed and intensity of this year's thaw has caught some off guard. As always: stay off flooded roads, keep children and pets away from swollen waterways, and report any significant local flooding to your municipality or conservation authority.
Source: CBC Ottawa / Raisin Region Conservation Authority
