Understand Flooding - Flood maps and river flows

November 2025 update

In May 2025, the Government of Alberta released updated Flood Hazard Area maps for communities across the province, including Calgary, that reflect the latest understanding of flood risk. The maps include a new approach for flood hazard area mapping, dividing the flood hazard area into four categories that reflect the level of risk of overland flooding.

The City recently completed a groundwater study to deepen our understanding of Calgary’s river flood-related groundwater risk. The study mapped groundwater levels during a 1 in 100-year flood event. We are proposing to incorporate this into Calgary’s regulatory flood map as a new Groundwater Flood Fringe. We have also been working to update Calgary’s Land Use Bylaw to reflect updated floodplain mapping and regulations.

We are now ready to share the draft updated regulations along with our new understanding of Calgary’s river flood-related groundwater risk. From November 24 to December 12, 2025, all Calgarians are welcome to participate in public engagement. Opportunities include an online survey, community drop-in events and a virtual information session. To learn more and get involved, visit engage.calgary.ca/rivervalleys.

Until Calgary’s Flood Hazard Area maps are finalized and City of Calgary policies and bylaws have been updated, development applications will continue to be assessed under the current Land Use Bylaw. However, we will continue to share the best available flood risk information with development applicants and others to provide advisory comments for further resilience, or to permit relaxations as appropriate, as we have since 2013.

We can’t prevent flooding entirely, but we can be prepared for when it happens. One of the best ways to be flood-ready is to know your flood risk.

Find out if you are at risk for flooding

Search for your property on our flood and river flow maps

Learn more about how flooding happens in Calgary, including types of flooding, highest risk seasons, causes and impacts to our city.

Current flood status

Is it flooding?

Alberta's current river flow

Stay informed

Flood alerts and notices

Calgary Flood Maps and River Flows

View our flood maps and river flow data to see if your property is at risk of flooding.

Our maps portal also includes access to other flood data including:

  • Flood hazard maps for land use planning
  • Inundation maps for various sized floods
  • Hydraulic models and hydrology assessments

View Calgary Flood Maps
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