Rearguard Falls, Waterfall in Rearguard Falls Provincial Park, British Columbia, Canada

Rearguard Falls is a waterfall on the Fraser River in Rearguard Falls Provincial Park, British Columbia, about 115 km downstream from Fraser Pass. The river drops roughly 6 m over about 20 m in several steps, with an average width of about 61 m and a maximum of about 73 m. A boardwalk from the Yellowhead Highway rest area leads to a close view.

Rearguard Falls marks the upstream limit of salmon migration on the Fraser River, roughly 1,260 km from the Pacific and 115 km downstream of Fraser Pass. The falls drop about 6 m over a 20 m stretch, a gradient some observers argue salmon could pass, yet they are not found above this point. The site lies in Rearguard Falls Provincial Park, separate from Mount Robson Provincial Park, which contains nearby Overlander Falls about 12 km away.

The falls mark the upstream limit of salmon migration on the Fraser River, roughly 1,260 km from the sea; no salmon pass beyond this point. The viewing boardwalk from the Yellowhead Highway rest area lets visitors watch fish gather below the 6 m drop, and staying on the path protects the surrounding plants.

The location is easily reached by a trail from Highway 16, and safety railings protect viewing areas. The best time to visit is late spring and summer when the water flow is stronger.

The falls drop only about 6 m over roughly 20 m of river, an average gradient near 300 per mille, so some visitors read the spot as a rapid rather than a waterfall. The Fraser here carries an average flow of about 171 m³ per second and does not freeze in winter, though temperatures nearby drop below zero.