Understand Flooding - Flood maps and river flows

May 2025 update

The Government of Alberta has released new, 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.

Calgary's updated flood hazard map reflects key investments in flood mitigation, which results in lower flood risk for many areas in Calgary. Our map now reflects the protection provided by the new Springbank Off-Stream Reservoir, reducing the flood hazard area along the Elbow River downstream of the Glenmore Reservoir and along the Bow River downstream of the confluence with the Elbow.

The City is now reviewing Calgary’s new flood hazard map along with groundwater mapping and working to update floodplain policies and regulations that will be incorporated in the existing Land Use Bylaw, as well as the new Calgary Plan and Zoning Bylaw. We will present Calgary’s maps and draft regulations during the Calgary River Valleys Project Stage 3 public engagement, anticipated in late 2025. To learn more about the Calgary River Valleys Project and to get involved, visit 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 according to existing flood maps and regulations. 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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