Heading into the long weekend, Calgary’s river flood season is now underway. Mid-May through mid-July are the two months each year when river floods are most likely to occur. The City’s annual flood preparations are complete, and we’re now on duty 24/7 to monitor river conditions, weather forecasts and the melting mountain snowpack.
Although there’s been above average snowfall in our mountains this winter, this is not a significant cause of concern from a flood perspective. River Engineering Leader Sandy Davis explains that there are many factors that contribute to river flooding events, by far the most significant is when there is heavy rainfall upstream of Calgary. “Snowmelt typically accounts for less than 20 per cent of the river flow during a flood event. High mountain snowpack is actually a good indicator that the Bow and Elbow Rivers will maintain strong flow this spring and summer, which is good news for Calgary’s water supply.”
Should a large rain system hit our region, Davis reassures that The City is prepared. “We’re ready to respond if we need to, to keep Calgarians safe and to protect critical infrastructure, vital community services, the environment and our economy. The City’s annual flood preparations are complete and we’re on duty, monitoring weather and river conditions closely over the next few months.”
Additionally, as Calgary heads into flood season, the city is more resilient than ever. While last year saw the completion of the Springbank Reservoir, providing additional protection along the Elbow River, this year marks yet another key milestone in Calgary’s flood resilience journey.
The communities of Sunnyside and Hillhurst are now protected from a 1-in-100 flood, thanks to the functional completion of the long-awaited Sunnyside Flood Barrier. The 2.4 km barrier includes a combination of permanent concrete and metal flood walls, with additional temporary barriers to close gaps across roadways and pathways during flood response.
Martin Pritchard, Manager of Linear Infrastructure Delivery notes that in addition to flood protection, the project includes riverfront enhancements. “We’re strengthening flood resiliency along the river while investing in the spaces people use every day through pathway improvements, new seating areas and gathering spaces. This work creates more connected spaces and preserves important memorial features that are part of Calgary’s history.”
While the barrier is operational for this river flood season, some construction activities focused on restoration and public spaces will continue this year, with full project completion anticipated in fall 2026. For the latest information, visit www.calgary.ca/sunnysidebarrier.
The City also reminds Calgarians that flooding can’t be entirely prevented so it’s important to take a few steps to be ready, and always exercise caution around riverbanks in the spring, as the fast-moving water can cause erosion and destabilization. If your property could be at risk of flooding, here are a few steps you can take to be ready for flood season:
Understand. Use our online interactive flood maps to know your home and community’s risk.Prepare. Take steps to reduce flood damage, keep your loved ones safe and be prepared if you need to evacuate quickly.Stay informed. River conditions can change quickly and with little warning. Visit calgary.ca/floodinfo for a quick snapshot of daily river conditions, sign up for alerts to stay informed and pay attention to any boating advisories issued by The City.
To help Calgarians be prepared, The City has flood preparation tools and resources available at calgary.ca/floodinfo.
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