The Horne Lake dam is part of a system built by DFO beginning circa 1958 solely for the purpose of salmon enhancement in the Qualicum rivers. The system includes flow regulation, and hatchery and spawning channel improvements. The dam created an absence of winter freshets, resulting in impacts in terms of natural stream flushing processes.
The Horne Lake spillway was rebuilt in 2002, utilizing a new rule curve that will increase peak winter flows and freshets, but not above bank-full levels unless a 200-year flood occurs when the spillway is overtopped.
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