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Report: Williston Watershed Impact Assessment Mapping - Use of BEMVRI (Broad Ecosystem Mapping and Vegetation Resource Inventory) to
Compare Current Conditions (2025) to Pre-flood (1968) Conditions (BAPID 6724)
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If you have any questions on the information presented, or require additional report data or attachments, please contact the
Ministry.
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The following report describes the steps completed for the Williston Watershed Impact Assessment Mapping Project. Two standardized Broad Ecosystem Mapping (BEM) coverages based on Vegetation Resource Inventory (VRI) linework (1:20,000 scale) were created to represent current conditions (2025) and pre-flood conditions (1968) for the Williston Reservoir Watershed Area within the Peace Region of British Columbia (BC). FWCP Project ID PEA-F26-W-4368-DCA
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Author: Madrone Environmental Services LTD.; Tania Tripp, R.P.Bio., Claire O'Brien, Anna Jefferies, and Alyssa Etherington
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Old Reference Number: 6724
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Old Reference System: BAPID
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Date Published: May 2026
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Report ID: 64916
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Audience: Government and Public
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The primary project objective was to create two ecosystem coverages representing two points in time to assess impacts as a result of the creation of Williston Reservoir. This included creating current conditions (2025) and pre-flood (1968) standardized BEMVRI products for the project area, and subsequent quantification of ecosystem change.
The first involved creating two standardized Broad Ecosystem Mapping and Vegetation Resource Inventory (BEMVRI) products. A BEMVRI coverage for the entire Williston Watershed Area (the project area) under current conditions (2025) was created. Next, a pre-flood (1968) conditions BEMVRI layer was developed using existing ecosystem mapping based on imagery from 1968 for the reservoir and high-water mark (Timberline 2006), and a VRI back cast product produced by Madrone to approximate age in 1968.
The second component consisted of a comparative assessment between BEMVRI 2025 and BEMVRI 1968 to quantify ecosystem losses resulting from reservoir flooding.
This project aligns with the FWCP Peace Action Plan: "Develop approach to incorporate cumulative effects into actions- P1". These BEMVRI products and the comparative analysis will support FWCP with understanding the species and ecosystem impacts from the flooding of Williston reservoir, assisting the regional board with strategic planning.
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Report Type
Subject
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Region - Omineca |
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Region - Peace |
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Terrestrial Information - Broad Ecosystem Inventory (BEI) |
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Terrestrial Information - Predictive Ecosystem Mapping (PEM) |
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Terrestrial Information - Terrestrial Ecosystem Mapping (TEM) |
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Vegetation - Vegetation (VRI) |
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Watershed Groups - 230 - Peace River |
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Program Specific Area - FWCP |
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