Everything about San Gabriel River California totally explained
The
San Gabriel River flows 75 miles through southern
Los Angeles County, California. It rises in the
San Gabriel Mountains, flowing southwest into and through the western
San Gabriel Valley before turning southward at the
Whittier Narrows to enter the
Los Angeles Basin. It forms the boundary between Los Angeles and
Orange counties for a brief stretch before it empties into the
Pacific Ocean between
Long Beach and
Seal Beach. It derives its name from the Spanish Mission San Gabriel Arcángel which was originally built in the Whittier Narrows (
1771) before being moved to its present location in San Gabriel.
Like most rivers in
southern California, the San Gabriel River today bears little resemblance to the river it was before the arrival of early
Spanish settlers. It is
dammed five times along its length: once along the West Fork by the Prescott F. Cogswell Dam, then twice more downstream of the forks in the San Gabriel Mountains to create
reservoirs at the San Gabriel Canyon Dam, and at the former naval test site Morris Dam; at the
Santa Fe Dam in the Santa Fe Dam Flood Control Basin in
Irwindale; and with the nearby
Rio Hondo (to which it's also connected by a short channel) at the
Whittier Narrows Dam, between the cities of
South El Monte and
Pico Rivera. Its channel is lined with
concrete for most of its length below the mountains. These alterations were made in response to disastrous
flash floods in the late 19th and early 20th centuries. During periods of heavy
rainfall, the Los Angeles District of the
U.S. Army Corps of Engineers can shift flows between the
Rio Hondo (a tributary of the Los Angeles River) and the San Gabriel River.
The San Gabriel River course is also the site for companion highways. In the lowlands it's adjoined by the
San Gabriel River Freeway (Interstate 605) which replaced an older Rivergrade Road. Into the San Gabriel Canyon it's followed by
State Route 39 to a terminus nearly 30 miles upstream.
As with the similarly modified
Los Angeles River, the San Gabriel is a notorious symbol of environmental depredation, and efforts to restore its ecosystem have had only limited success due to
water pollution and
fertilizer runoff.
Further Information
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