International Osoyoos Lake Board of Control



Public Meeting of the International Osoyoos Lake Board of Control
October 17, 2017
Sonora Centre, Osoyoos, BC
6:00-8:15 pm

The 2017 public meeting of the International (IJC) Osoyoos Lake Board of Control has been scheduled for the evening of October 17, 2017 at the Sonora Centre, 8505 68 Avenue, Osoyoos BC, from 6:00-8:15pm. This meeting will feature a screening of a new film on transboundary water management in the Okanagan River Basin.  Attendance is free and all are welcome.  For more information, see the agenda

Call for Scenic Photos of Osoyoos Lake and surrounding area!

The International Osoyoos Lake Board of Control is seeking digital photo submissions from members of the public for posting to this website.  Specifically, we are accepting submissions of high quality scenic photos for use as home page sliders.  Please see the attached submission criteria and considerations here and send us your best Osoyoos Lake pics!


Past Activities:


Temporary Variance approved for summer 2015 Osoyoos Lake levels.

On July 28, 2015, the International Joint Commission (IJC) approved a temporary variance from the standard, non-drought rule curve for Osoyoos Lake (specified in Condition 7 of the Order) that had been in effect up to this date. As a result, the Washington State Department of Ecology (Ecology) is allowed to operate Zosel Dam according to the drought-condition rule curve specified in Condition 8 of the Order until November 1, 2015, even though the drought criteria specified in Condition 8 have not all been met. The IJC approved the variance under Condition 10 in recognition of the need for more flexibility in the operation of Zosel Dam during this year’s extreme hydrologic conditions that have led both Washington State and British Columbia to declare drought emergencies.

Washington State Department of Ecology's press release about the operational implications of this variance for Zosel Dam (and water levels on Osoyoos Lake) can be accessed at:


Plan of Study reports - The IOLBC contracted various technical and scientific studies to provide necessary information to the IJC in the period leading up to renewal of the IJC Order for Osoyoos Lake in 2013.  These studies helped to inform changes brought about in the form of the IJC's Supplementary Order of Approval for Osoyoos Lake in January, 2013.  The studies are identified as follows (click link to see the reports):

Plan of Study Report (overall summary)

Study 1 (Assessment of Water Level Conditions)

Study 2 (Evaluation of Drought Criteria) and Study 3 (Review of Summer & Winter Operations)

Study 4 (Osoyoos Lake Water Quality and Zosel Dam Operations)

Study 5 (Methods for Including Ecosystem Function)

Study 6 (Climate Change Implications)

Study 7 -1 (Factors Affecting High Lake Levels)

Study 7 -2 (Public Consultation and Stakeholder Engagement)

Study 8 (Methods to Monitoring Channel Capacity in the Okanagan River)