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Douglasdale and McKenzie Lake Slope Stability Project

Project update – October 10, 2017

The City continues moving forward on a long-term solution of identified slope movements on the escarpment east of the Bow River adjacent to the communities of Douglasdale and McKenzie Lake. These movements have caused damage to The City’s pathway along a 3.5 km section.

The City is working toward a long-term solution on the most urgent section as part of a priority restoration of the slope and pathway. Currently, one kilometre of pathway is closed in that area as a safety precaution and to facilitate construction.

The City has issued a Request for Proposal (RFP) related to the construction of a retaining wall adjacent to the pathway of this section. The RFP closes in October and a contract is anticipated to be awarded shortly afterwards.

Repair work in 2016 and early 2017 involved using construction equipment to drill piles to provide firm ground on the pathway area at the top of the slope where the pathway has collapsed. Watch a short video of this work.

For safety reasons fencing has been set up to seal off the construction area. For the public’s safety and to maintain the stability of the slopes. The City asks citizens to follow the detour signs and to not access either the closed area or the slope below it.

Monitoring of the pathway is ongoing to ensure detection of any further erosion.

Pathway closure remains in effect

The City closed approximately one kilometre of the pathway for safety reasons in August 2016 and it remains closed and will remain closed until restoration of the slope and reconstruction of the pathway can be completed. The pathway has been detoured along Mt. Alberta View and Mt. Douglas Close S.E.

Long-term solution

The City continues with plans to develop a design to protect the 3.5 km section of the pathway, as identified in the report presented to committee and Council in late fall 2015. The process involves developing detailed design, additional data collection and construction.

Slope stability projects are highly complex and this work will require more data in order to design the best solution. One solution will not fit every section of the pathway – there may be a variety of solutions developed in order to meet the conditions in each section.

About the project

Slope movements on the escarpment east of the Bow River adjacent to the communities of Douglasdale and McKenzie Lake have caused damage to The City’s pathway along a 3.5 km section.

Since 2005, The City has worked with external consultants to monitor, investigate and develop restoration options for The City’s Infrastructure (the slope and the pathway) in accordance with the Slope Stability Management Framework. In August 2015, a geotechnical consultant completed a Feasibility Study with initial recommendations and cost estimates for the long-term stabilization of the slope and reconstruction of the pathway. The City’s responsibility is to stabilize the slope and the pathway to ensure the safety of pathway users.

In 2016 The City began working on the design and construction of a solution to improve the stability of the slope and the pathway that supports the slope. The project will take place in phases and over several years.

Heavy rain during the summer of 2016 caused erosion of the pathway in a section behind Mt. Alberta View. Through an inspection process The City closed the pathway for safety reasons. The City will continue to monitor the slope and the pathway.

Project timeline

September 2016 - Restoration work begins on most urgent section of pathway instability

Late 2017 - Construction of long-term solution anticipated to begin

Communication

The City will continue to provide updates including updates to this webpage.

Please fill out the 311 online form if you require more information.

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