Water-Up and Impoundment


Reservoir Impoundment at Keeyask is completed. Reservoir Impoundment at Keeyask started in late afternoon on August 31, 2020 and was completed in five days, reaching a peak water level on Gull Lake of about 158.92 metres (521.4 feet) late Saturday afternoon, September 5, 2020.

Water level data show that there has been no changes in water levels on Split Lake and Clark Lake due to the impoundment of the Keeyask Generating Station reservoir.

The rise of water levels upstream – within the expected area – averaged 0.5 metres (about two feet) per day. The water level in the Keeyask forebay (Gull Lake) is within the normal operating range of 158-159 metres (518.4 to 521.7 feet). It is expected that the forebay water level will fluctuate within this range going forward.

Daily updates

Water-up completed

The process of watering-up the Keeyask Project is complete.

Water-up is the process of filling enclosed work areas kept dry during construction. Water levels in these work areas were raised until they matched the current water level of Gull Lake at the Keeyask site. Cofferdams enclosing these work areas were removed or lowered to improve water flow and allow safe travel for boats after impoundment.

Weekly updates

More information

Water-up and Impoundment Info Sheet