The Harrison River is a short but rich in water right tributary of the Fraser River, whose mouth is located near Chehalis.
The Harrison River dewatered Lake Harrison Lake and is thus the continuation of the Lillooet River, which flows to the lake. Measured from the source of the Lillooet River, he reached a total length of 177 km.
The Harrison River is navigable, although it was necessary in the days of the Fraser Canyon Gold Rush to dredge sand banks at its mouth, which are known as "the riffles ." There is also easy rapids and difficult places in the portion below the effluent from the Harrison Lake.
Below the confluence with the Chehalis River at the bridge (British Columbia Highway 7) between Chehalis and the location of Kent, the river widened to the so-called Harrison Bay, and finally empties into the Fraser River. In addition, the Harrison River is crossed by the main line of the Canadian Pacific Railway.
The course of the Harrison River was a part during the Fraser Canyon Gold Rush of Water and coach route to the British Columbia Interior, the so-called Douglas Road.