It rises in the San Bernardino Mountains and flows for most of its length through San Bernardino and Riverside counties, before cutting through the northern Santa Ana Mountains via Santa Ana Canyon and flowing southwest through urban Orange County to drain into the Pacific Ocean.

Flowing nearly 100 miles from its northernmost reaches at the crest of the San Bernardino Mountains out to the coast near Huntington Beach, the river runs through wild lands, agriculture, parks, towns, and cities, touching the lives of millions of Californians.

Apr 28, 2024 · The Santa Ana River is the largest river in Southern California. It traverses an area that is home to nearly 2/3rds the state population. However, for many Southern Californians, the river is surprisingly unseen and unknown.

The Santa Ana River is a major river in southern California, in the United States. It begins in San Bernardino County and flows west about 100 miles (160 km) to the Pacific Ocean, through Riverside and Orange counties.

The Santa Ana River begins in the San Bernardino Mountains, flowing through the urban core of San Bernardino, Riverside, and Orange Counties before reaching the Pacific Ocean at Huntington Beach. After decades of advocacy, the 110-mile Santa Ana …

Feb 27, 2024 · The Santa Ana Sucker (Pantosteus santaanae) and Arroyo Chub (Gila orcuttii) are extant native freshwater fishes in southern California. There are numerous threats hypothesized responsible for the poor condition of both fishes in the Santa Ana River.

Sep 15, 2014 · Southern California’s Santa Ana River is the largest watershed drain­age south of the Sierra and is located largely in a highly urbanized, highly regulated setting. At about 100 miles long and with more than 50 tributaries, the Santa Ana spans parts of San Bernardino, Riverside and Orange counties as it drains 2,840 square miles of land.

Did you know the Santa Ana River is Southern California’s longest waterway? Flowing for 100 miles through San Bernardino, Riverside, and Orange Counties, the upper portions of the River through Riverside and San Bernardino remain uniquely un-channelized.

The Santa Ana River Watershed is our major focus. This watershed covers more than 3,000 square miles of San Bernardino, Riverside and Orange Counties, and a small portion of Los Angeles County. It also encompasses the San Jacinto River Watershed.

The region’s two main rivers are the Santa Ana River and the San Jacinto River. The Santa Ana River originates in the San Bernardino Mountains and flows through San Bernardino, Riverside and Orange counties on its way to the ocean.