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.

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. It has a watershed of …

The Santa Ana River Mainstem Project is located along a 75-mile reach of the Santa Ana River in Orange, San Bernardino and Riverside counties.

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.

Apr 30, 2023 · The Santa Ana River stretches over a distance of 110 miles before reaching the Pacific Ocean at Huntington Beach. It is the largest river entirely within Southern California. (A historical marker located in Anaheim in Orange County, California.)

Feb 27, 2024 · Native Fish Population and Habitat Study, Santa Ana River, California. The Santa Ana River, the largest river in southern California, flows through diverse landscapes, from the high desert to urban and suburban areas in Orange, Riverside, and San Bernardino Counties, stretching approximately 96 miles (154 kilometers) from its headwaters in the ...

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 …

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. It transports more than 125 million gallons per day of recycled water from Riverside and San

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.