A hidden gem in the heart of Orange County, IRWD’s San Joaquin Marsh purifies urban runoff in the most beautiful way. It is owned and protected by IRWD.
At the San Joaquin Marsh, wildlife rarely fails to put on a show. Birdwatchers and photographers have identified more than 300 species of birds at the marsh, tucked inconspicuously along Riparian View in Irvine. But visitors may be unaware of the Marsh’s true identity: a water quality treatment facility.
San Joaquin Marsh, a wetland of distinction, is a place for everyone to enjoy the beauty of nature. Visitors can walk along the trails, take photographs, or simply relax under a native willow and listen to nature.
HOURS: Open dawn to dusk every day
ADMISSION: Free
ADDRESS: 5 Riparian View, Irvine, California
Map
Please follow these rules to ensure the well-being of the plants and animals that call the Marsh home.
The first and largest of IRWD’s NTS sites, the Marsh was established in 1997.
95% of the dry-weather runoff in San Diego Creek is diverted into the Marsh.
The Marsh has a water residence time of about 21 days.
The wildlife sanctuary encompasses more than 300 acres of coastal freshwater wetlands.
About half has been restored to its natural state. The remaining acres are quality habitat and are not in need of restoration.
With 12 miles of walking trails, the Marsh is a beautiful place to enjoy nature. Trail map
Up to 75% of the nitrogen in urban runoff is removed simply by giving the water time to interact with plants and soils in ponds and wetlands.
Less nitrogen and fewer pollutants entering the San Diego Creek Watershed means fewer algae blooms and a healthier Upper Newport Bay.
Before you stop by, here are a few helpful links.
Marsh Campus is a community gathering place, an educational hub, and a walk through the historic Irvine Ranch.
