With flow of the Similkameen River declining since its recent peak on June 1, the backwater effect of the Similkameen River on the Okanogan River is decreasing. This allows for increased outflow from Osoyoos Lake and a corresponding drop in its level. Osoyoos Lake crested at 913.65 ft.
Due to recent snowmelt in the high elevations of the Okanagan and Similkameen watersheds, Osoyoos Lake surpassed the 912.0 feet level (Plot 1) at 03:00 am PDT on May 14, 2020, with lake levels continuing to rise.
The International Osoyoos Lake Board of Control is holding its annual public meeting regarding the regulation of Osoyoos Lake water levels and the related operation of Zosel Dam by the State of Washington under the International Joint Commission’s Orders of Approval.
The International Osoyoos Lake Board of Control (Board) will allow for a broader range of water levels on Osoyoos Lake this summer to help limit the impacts of dry conditions in the basin.
The level of Osoyoos Lake has been rising since late April when increasingly warm temperatures began to melt the Okanagan River basin’s deep snowpack, which exceeded 150 percent of normal.