Shasta River
From Wikipedia, the free encyclopedia
The Shasta River is a tributary of the Klamath River, approximately 40 mi (64 km) long, in northern California in the United States. It drains a basin called the Shasta Valley on the west and north sides of Mount Shasta in the Cascade Range.
It rises in southern Siskiyou County on the edge of the Shasta-Trinity National Forest, approximately 10 mi (16 km) southwest of Weed. It flows generally northwest through the Shasta Valley, past Weed, through Lake Shastina, and past Montague. It joins the Klamath from the south approximately 8 mi NNE of Yreka.
The Shasta Valley is dominated by nearby Mount Shasta and underlain with volcanic basalt from eruptions of the mountain in recent geologic time. Pluto Caves under the valley floor comprise 50 sq mi (130 km²) of underground tubes formed by trapped air during lava flows. The central valley is covered with small hillocks that are the debris from the liquefication of the ancestral Mount Shasta (on the site of present Black Butte) approximately 300,000 years ago.
