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As of November 1, 2023, the Rule Curve for maximum and minimum Osoyoos Lake levels has changed for the winter period, allowing lake levels to be maintained between 909.0 feet and 911.5 feet until March 1, 2024 (Figure 1). Figure 1: 2023 Osoyoos Lake Levels (bright green) and allowable range under...
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The spring freshet in the Okanagan/Okanogan and Similkameen basins has commenced as snowpacks have begun to melt due to above normal temperatures in the last week. The snow pillow gauge at Mission Creek (elevation 1,780 meters or 5,840 feet) in the Okanagan basin was above normal for this time of...
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Climatological conditions within the Okanagan/Okanogan and Similkameen River basins varied during 2022, with the greatest impacts related to a cool spring leading to delayed snowmelt and a delayed freshest peak at Osoyoos Lake. While near-normal temperatures prevailed at the start of 2022...
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The spring freshet in the Okanagan/Okanogan and Similkameen basins has started, but unseasonably cold temperatures this spring have limited snowmelt and runoff. High-elevation snow pillow gauges at Blackwall Peak in the Similkameen Basin (at an elevation of 1,940 meters or 6,365 feet) and Mission...
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After slowly declining since late July following a dry summer, Osoyoos Lake level reached the targeted winter operational elevation of between 909.45 to 909.55 feet in early December according to the Washington State Department of Ecology, which owns and operates Zosel Dam. Lake level is anticipated...
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On November 15th, discharge of the Similkameen River began to increase rapidly. This was due in part to the landfall of a Category 5 atmospheric river causing heavy, sustained rainfall and rising temperatures resulting in additional runoff from snowmelt. A flood warning for the Similkameen River was...
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The International Osoyoos Lake Board of Control is holding its annual public meeting regarding the regulation of Osoyoos Lake water levels and the related operations of Zosel Dam by the State of Washington under the International Joint Commission’s Orders of Approval.
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Osoyoos Lake level reached the summer target elevation of 911.70 feet in late May, then crested to 911.82 feet (277.923 m) on June 15, below the maximum allowable International Joint Commission (IJC) Order of Approval rule curve of 912.0 feet.
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The spring freshet in the Okanagan/Okanogan and Similkameen basins has begun as temperatures increase. The snow pillow gauges at Blackwall Peak in the Similkameen Basin (elevation 1,940 m) and Mission Creek in the Okanagan Basin (elevation 1,780 m) are near their annual peak and are both currently...
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The International Osoyoos Lake Board of Control is holding its annual public meeting regarding the regulation of Osoyoos Lake water levels and the related operations of Zosel Dam by the State of Washington under the International Joint Commission’s Orders of Approval.
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During the spring freshet, the level of Osoyoos Lake crested at 913.65 ft (278.481 m) on June 2 and decreased below the maximum level of the IJC (International Joint Commission) Order of Approval rule curve (912.0 ft) on Saturday July 18.
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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. (278.481 m)...
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In compliance with the terms of the International Joint Commission (IJC) water management Order for Osoyoos Lake implemented by the International Osoyoos Lake Board of Control (https://www.ijc.org/en/olbc), the gates at Zosel Dam have been fully open since May 11 to allow for maximum outflow from...
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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 Applicant to the IJC Orders of Approval for Osoyoos Lake that operates Zosel Dam...
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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 board implements an Order from the International Joint Commission (IJC) that mandates a range of allowable...
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