News

Ghost River location selected for new Bow River Reservoir

Alberta is moving forward to expand and relocate the Ghost Reservoir to protect communities on the Bow River.

The Bow River runs through the most populated regions of Alberta, so managing water levels in this river is important to help the province respond to floods, droughts and other extreme weather. Past events like the 2013 floods have shown the importance of protecting communities downstream.

After reviewing multiple options, the Alberta government has determined that the relocated Ghost Dam option is significantly better than the Glenbow East option due to its lower cost, ability to mitigate future droughts and floods, and fewer social and environmental impacts.

Aerial view downstream of the existing Ghost Dam. (Thumbnail)

Aerial view downstream of the existing Ghost Dam (Photo credit: WSP).

“Increasing water storage capacity is critical to protecting Calgary and other communities along the Bow River from future floods and drought. Based on the data collected in the study, one option, the relocated Ghost Dam, is clearly the best choice to move forward with.”

Rebecca Schulz, Minister of Environment and Protected Areas

In 2013, the southern Alberta flood caused more than $5 billion in damage in Calgary and surrounding communities. Creating additional water storage will significantly reduce the impact of severe weather events on Albertans who live and work around the Calgary area.

After extensive study, Alberta’s government is moving forward with exploring the relocated Ghost Dam option because it has a smaller project footprint and fewer overall impacts to the environment, property and infrastructure, while providing comparable water storage to the Glenbow East option.

The Glenbow East option posed higher risks to downstream communities during construction, including Calgary. Its earthfill dam would also be more susceptible to erosion and failure during large flood events compared to the Relocated Ghost Dam, which is a concrete gravity dam.

Alberta will now move to the next phase of the project. Phase 3 is the engineering and regulatory approval phase, and more information on this work will be shared in 2025.

Quick facts

A May 2017 report by the Bow River Working Group included a recommendation to complete conceptual assessments of three major reservoir options on the Bow River, upstream of Calgary.

  • Relocated Ghost Dam: An expansion of the existing Ghost Reservoir.
  • Glenbow East: A new reservoir between Cochrane and the Bearspaw Dam at the western edge of Calgary.
  • Morley: A new reservoir between Seebe and Morley, on Stoney Nakoda Nations reserve land. This option is no longer being pursued.
  • The potential selection and implementation of a reservoir option on the Bow River upstream of Calgary is being approached in four phases
    • Phase 1: Conceptual Assessment
    • Phase 2: Feasibility Study
    • Phase 3: Engineering and Regulatory Approval Process
    • Phase 4: Procurement, Construction and Commissioning
  • In 2021, Alberta began engagement and field studies for Phase 2, the feasibility study. It assessed technical feasibility, while carefully considering a variety of social, environmental, cultural, traditional land use, engineering and economic elements. The final report will be released in early 2025.
  • An alternatives assessment was also conducted to determine if something other than a new reservoir could provide equivalent flood and drought protection. Options were evaluated, but none provided the water storage necessary to mitigate impacts from both floods and drought, without significant issues related to Treaty rights, environmental impacts and regulatory challenges.
  • The project will now transition from Alberta Environment and Protected Areas to Alberta Transportation and Economic Corridors for Phase 3.
  • Along with the Bow River Reservoir, Alberta is also developing the Springbank Off-stream Reservoir to provide protection along the Elbow River in Calgary and other downstream communities as part of an overall flood mitigation system

July 2024 - Update from the Bow River Reservoir Options Study Team

Phase 2: Feasibility Study 

Thank you for your continued interest in the Bow River Reservoir Options (BRRO) initiative. As part of our commitment to provide regular updates on the initiative, we would like to share information on the recent engagement activities and our work assessing alternatives to a dam and reservoir. 

Given the need to move in a timely manner to prevent floods and mitigate drought along the Bow River, Environment and Protected Areas will not advance the Morley option any further at this time. The study continues to assess technical feasibility, while carefully considering a variety of social, environmental, cultural, traditional land use, engineering and economic elements for the remaining Relocated Ghost Dam and Glenbow East options. Accordingly, recent engagement efforts focused on these two options. 

The current stage of the initiative is indicated in the graphic below. For more details on the BRRO initiative, including feasibility study updates and engagement opportunities, please visit: https://www.alberta.ca/ bow-river-reservoir-options.aspx

Engagement on the BRRO is designed to build our understanding of what is important to Albertans when considering a potential new reservoir on the Bow River, upstream of Calgary. 

The objectives of the engagement activities during the Phase 1: Conceptual Assessment was to understand who could be affected by the reservoir options, and to gather general input on the three options being studied. As part of the Phase 2: Feasibility Study, engagement focused on asking the key question “What factors should be considered when evaluating the three reservoir options? Environmental? Social? Economic? Other?”  

The almost 2,300 comments received between September 2019 and March 2023 helped make up a developing list of factors that were grouped into four categories for evaluating the options: 

  • Project implementation and performance objectives 
  • Social 
  • Environmental 
  • Economic 

From April 15 to May 13, 2024, Albertans shared input on these categories and their associated factors through completion of an online questionnaire, which included asking them to rank the factors, identifying what was important to them. 

Almost 1,000 people have accessed the spring 2024 virtual information centre to date, which provides descriptions of the categories and factors, along with updates and other information about the feasibility study. 

Questionnaire responses show the top five factors of importance are: 

  • Park/park-type Crown land (social category), 
  • Wildlife (environmental category), 
  • Recreation (social category), 
  • Wetlands (environmental category), and 
  • Historical sites (social category) 

We continue to review the almost 3,000 questionnaires completed by participants, along with hundreds of emails received. So far there are well over 5,000 comments for the study team to analyze and consider. 

What happens next? 

The study team is currently reviewing the spring 2024 engagement results. At the completion of the feasibility study, the final deliverables will include a report summarizing engagement activities and results. All input received, whether through structured engagement activities or emails and other communications, will help us determine which reservoir option, if any, will proceed to Phase 3: Engineering and Regulatory Approval Process 

The Alberta government is looking at alternatives, what does that mean?  

Although the BRRO is exploring a potential new reservoir on the Bow River upstream of Calgary for water management flexibility, much work has gone into assessing if there is something else, an alternative, that could be done that would provide equivalent flood mitigation and drought protection. The Alberta government is preparing a report that synthesizes the assessments of key alternatives, documenting in one place their benefits, risks and other important considerations. This will help inform a decision on whether to proceed with one of the reservoir options to Phase 3: Engineering and Regulatory Approval Process. 

What alternatives are included? 

Many alternatives were assessed by the Bow River Working Group, as described in their May 2017 report, Advice to Government on Water Management in the Bow River Basin. The BRRO was initiated as a result of the Alberta government accepting a recommendation from this report. 

Other alternatives were assessed during the Phase 1: Conceptual Assessment as documented in the final report, identified as part of a jurisdictional review conducted by the BRRO study team in 2023 or recommended to the Alberta government during BRRO engagement. 

How do we define alternatives?  

After reviewing the alternatives, they were grouped into three categories: 

  • Alternatives to: Alternative strategies instead of a new dam and reservoir on the Bow River, upstream of Calgary, which could potentially provide equivalent flood mitigation and drought protection. 
  • Alternative means: A new but different dam and reservoir option on the Bow River, upstream of Calgary, which could potentially provide equivalent flood mitigation and drought protection. 
  • Complementary alternatives: Complementary actions as secondary measures which may work with a dam and reservoir that is providing the primary flood mitigation and drought protection. 

Posted in: Water & Utilities

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