Lillooet River, Mountain stream in British Columbia, Canada.

The Lillooet River begins at Silt Lake on the edge of the Lillooet Crown Icecap, about 80 km northwest of Pemberton, and runs some 95 km through its upper valley before entering Lillooet Lake 15 km downstream from Pemberton, on the eastern outskirts of the Mount Currie reserve. Below the 30 km length of Lillooet Lake it resumes near Skatin and continues about 55 km to Harrison Lake. Its main tributaries are Meager Creek, the Ryan, Green and Birkenhead rivers.

During the Fraser Canyon Gold Rush in the 1800s, the lower reaches of this river served as a key transportation corridor connecting coastal regions to the interior. This route was essential for prospectors and merchants moving between the settlement areas and mining camps.

The river flows through lands of several Indigenous nations, including the Líl̓wat and St'at'imc peoples, who maintain strong ties to these waters today. For these communities, the waterway remains central to their traditional practices and connection to the territory.

The river runs from Silt Lake on the Lillooet Crown Icecap down the upper valley to Lillooet Lake, then resumes below the lake for about 55 km to Harrison Lake. Access to the upper valley is from Pemberton, roughly 15 km upstream of the lake outlet; the flat bottomlands from Pemberton Meadows to the lake form the Pemberton Valley farming region. Below Harrison Lake the stream is called the Harrison River.

Keyhole Falls was created by a major eruption of Mount Meager roughly 2400 years ago that formed a natural dam of volcanic rock. Over the centuries, flowing water gradually eroded this barrier, eventually carving the waterfall you see today.