This is due to it being fed from a large reservoir backed up behind a dam from which a constant flow of water is released.

[1] The upper portion of the river and the reservoir are part of the Seymour watershed, controlled by Metro Vancouver.

The Seymour River has been the main water supply for North Vancouver since 1907.

Up to 40,000 fed coho fry are released above the dam each year by the Seymour Salmonid Society.

This article about a river in the Coast of British Columbia, Canada is a stub.