Millbrook Dam Reconstruction

Otonabee Conservation is set to embark upon a major capital  project with the reconstruction of the Millbrook Dam.

The Board of Directors of Otonabee Conservation approved the awarding of a construction contract to Facca Incorporated at it regular meeting, held Thursday, October 19, 2017.

Pictured above is a rendering of the new design for the Millbrook Dam.


The floor of the spillway has been designed to address geo-technical issues of the site; these design features will not be visible to the viewer as they are below ground and underwater.

The weir will be a u-shaped weir with outside wall dimensions of 5 meters by 16 meters by 5 meters.

The spillway will be 12 meters wide.

The size and water level of the mill pond will remain the same as present and the waterfall sights and sounds will be very similar to existing conditions.

A public walkway over the dam will be installed and the area will be landscaped.


Update Posted February 23, 2018:

Onsite construction activity continues as the water level in the pond is being lowered and water is beginning to flow through the diversion channel. Shortly, water will stop flowing through the concrete spillway.

Please be aware that with a lower pond level, the ice on the pond will be extremely unsafe and unpredictable. Please do not go on the pond – stay off the ice!

Update Posted January 19, 2018:
Onsite construction activity including the installation of safety fencing and the arrival of heavy equipment has begun. Residents are reminded to stay out of the fenced in area where construction activity will occur.

Over the next week work will start on the construction of the water diversion channel and coffer dams. This will involve the placing of sheet piling which will generate some noise. The work will occur from Monday to Saturday from 7:00 a.m. to 7:00 p.m. and on Sunday from noon to 8:00 p.m.

Construction of the spillway is scheduled to begin in April, 2018 and will be undertaken in a single phase.

The fourth and final phase of the construction project will involve the removal of the coffer dams and the installation of hardscaping on the earthen embankment of the dam.


The safety of the public ~ residents and visitors to the community ~ is of utmost importance during the construction of the Millbrook Dam. The project will draw the attention and curiosity of the public, and given the inherent dangers of a construction site measures will be taken to keep members of the public away from the site.

The construction site will be fenced, and posted with warning signs, prohibiting public access; only authorized personnel will have access to the site. The security fencing will remain in place throughout the entire construction period.

Please be aware of vehicular activity around the Millbrook Dam and immediate area. Heavy equipment, dump trucks and utility vehicles will be on site and moving within the area throughout the construction period.

Given the nature of the construction activity, the water level in the pond will be lowered by one meter throughout the construction period. The ice will not be safe, so please stay off the ice and away from the water’s edge during the cold weather period.


Otonabee Conservation will provide regular updates throughout the duration of this project, so be sure to check back from time to time.

If you have a question, or an observation to share, you may contact Otonabee Conservation by email at

The chronology of the various phases of this project may be found in the Chronology of the Millbrook Dam section.