Boundary Dam Spillway Upgrade
Boundary Dam Reservoir serves as a source of cooling water for the Boundary Dam Power Station, SaskPower’s largest generating station. KGS Group was retained to perform a dam safety assessment of the Boundary Dam structures.
The dam safety review identified a number of concerns, the most critical of which were insufficient spillway capacity and deficiencies with the condition of the existing spillway. Our team was then retained to design spillway upgrades to extend the life of the 50+ year old structure and to double the discharge capacity of the spillway. We performed preliminary and final design for complete replacement of the spillway chute and basin, while maintaining the reservoir at full supply level. The work also included the installation of over 400, +30-metre-long anchors.
The team overcame complex foundation issues with bentonite seams, coal layers and high groundwater. Another critical site challenge was to design and complete each year’s construction such that the spillway could potentially pass spring flood flows. Despite many challenges, the project was completed on schedule and near budget.
Project Highlights
- Dam safety assessment, spillway upgrade design, construction support
- Complete replacement of spillway chute and basin while maintaining full supply level
- Discharge capacity doubled to improve flood performance and safety
- Installation of 400+ anchors, each over 30 metres in length
- Foundation treatment addressing bentonite seams, coal layers and high groundwater
Brandon Third Street Dam Replacement
For more than 70 years, the Third Street Dam on the Assiniboine River supported the City of Brandon’s drinking water supply and provided social, environmental and commercial benefits. When the dam was irreparably damaged, KGS Group moved quickly to design temporary emergency measures that limited further habitat impacts and preserved Brandon’s water supply.
We then developed a functional, cost-effective, permanent solution that also removes a 70-year-old barrier to fish passage. The new overflow rockfill weir, with a low flow rock ramp fishway, preserves Brandon’s water supply, restores fish passage, adds spawning habitat, and improves the safety and aesthetics of the river adjacent to Dinsdale Park.
Working with the City of Brandon and regulators, the team demonstrated how preserving vital infrastructure can go hand‑in‑hand with prioritizing and enhancing the environment.
Project Highlights
- Designed and implemented temporary emergency measures to stabilize the river and maintain municipal water supply during dam failure
- Constructed an overflow rockfill weir to replace the damaged dam and secure long‑term water levels for intake reliability
- Constructed a low‑flow rock ramp fishway to restore year‑round fish passage and remove a 70‑year barrier
- Integrated spawning habitat through rock ramp geometry and material gradation, enhancing local fisheries