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The Coquitlam River watershed is one of many watersheds found on the north shore of the Lower Mainland Region.  This watershed was shaped by forces of glaciation 10,000 to 14,000 years ago. The Coquitlam River Watershed is a typical example of the watershed in the region.  The Lower Coquitlam River Watershed, below the Coquitlam Lake Reservoir Dam, includes at least 30 watercourses. The two largest tributaries of the Coquitlam River are Or Creek with a catchment area of approximately 22 sq km and the Hoy/Scott/Pinnacle Creek catchment area totalling approximately 17.5 sq km.  

The Coquitlam River watershed is part of the traditional territory of the Kwikwetlem First Nation.  The Kwikwetlem First Nation members live on the Coquitlam River and are working hard to restore their culture, traditions and livelihood, all of which depend on a healthy Coquitlam River.