Harrison Bay is a lake-like expansion of the Harrison River, located west of its main course^[1] adjacent to the communities of Chehalis and Harrison Mills in the Canadian province of British Columbia. Extremely shallow, the bay outlets to the Fraser at Harrison Mills, where in pre-gold rush times there had been a "riffle", which was dredged to enable easier steamer traffic to Harrison Lake and Port Douglas. The bay has been used as a log sort but is primarily recreational in use today, with the Scowlitz Indian Band running a beach and campground at its western end, on Squawkum Creek Indian Reserve No. 3, which is at the southwest corner of Harrison Bay.^[2][3] Between it and the Fraser lies Harrison Hill, known in Upriver Halkomelem as Qithyll, which is an ancient burial ground currently under investigation by the First Nation in a joint effort with Simon Fraser University's archaeology department.. Adjacent to Kilby Provincial Park and the site of Harrison Mills are Williams Indian Reserve No. 2 and Scowlitz Indian Reserve No. 1^[4][5]