Explore Salt Ponds and Marsh at Alviso Marina County Park

Alviso, Ca – Connect with a site that’s a part of one of the largest tidal marsh restoration projects on the west coast. Alviso Marina County Park was formerly an industry-dominated site, but now serves as an amazing entrance to the greater Don Edwards San Francisco Bay National Wildlife Refuge.

About the Park

Alviso, Ca – Santa Clara County Park 

Science Spotlight: Leopard Sharks at Alviso

When I first learned that there were actual sharks around Alviso, I was in total shock. To me, the idea of the perfect habitat for sharks had always been the open ocean. Thus, you can imagine my surprise when I learned that the area is home to leopard sharks.

Leopard sharks are the most common sharks in the San Francisco Bay estuary, with a range that extends from Oregon to Mexico. They can grow to lengths of up to 7 feet, and feed on invertebrates and fish. To feed, they make a daily migration to shallow areas during high tides.

The San Francisco Bay Area lost much of the tidal marsh and shallow areas utilized by the leopard sharks to development for harvesting salt. As these tidal marshes are restored, researchers are finding that the leopard sharks are returning.

Leopard shark; Source: © Nathan Rupert, 2009, Flickr Photo Album, some rights reserved.

Park History

Visiting Alviso truly feels like a blast into the past: on your way to the park, you pass by an old cannery site, the warehouses, and a Victorian-style home. The area that is now Alviso Marina County Park used to be receive drainage rich in mercury from the New Almaden Mining District. The site also used to be a heavily-trafficked port area supplying San Jose and a launching point for steamboat passage to San Francisco. When these operations shut down, the area was transformed into salt ponds for salt harvest, operated by the Cargill Salt Company.

The area is now rich with wildlife, providing a feeding and nesting area for many species of birds. Alviso Marina County Park has become a part of the nearby Don Edwards San Francisco Bay National Wildlife Refuge. Today, the area is part of the South Bay Salt Pond Restoration Project (SBSPRP), one of the largest tidal marsh restoration projects on the west coast. Restoration offers new habitat for California wildlife and offers visitors the chance to see nature reclaiming a formerly industry-dominated area.

For more detailed information on the history of Alviso Marina County Park, check out this article by the Mercury News.

Visit the Park

Please note that there is no entrance fee to enter the park. Dogs are now allowed on trails or walkways. For more detailed information on where dogs are and aren’t allowed, check out the park map.

Alviso Marina County Park serves as the entrance to the greater Don Edwards San Francisco Bay National Wildlife Refuge. We encourage you to explore that area as well, time permitting.

Here are some helpful resources to plan your visit:



Birdwatching Bonanza at Palo Alto Baylands Nature Preserve

Palo Alto, Ca – Some of the best birdwatching in the entire South Bay is right in your backyard. Learn more about bird diversity and plan your visit to the Palo Alto Baylands.

About the Park

Palo Alto, Ca – Nature Preserve

Science Spotlight: Bird Diversity at Baylands

The Palo Alto Baylands Park is a favorite of mine and Dan’s in the area. Considered one of the best places to go birding in the South Bay, the Baylands Nature Preserve offers tremendous bird diversity no matter the month. When visiting, we’ve found that the entrance near San Antonio Road is a great starting point.

As you enter the park, scan the tall vegetation around the creek to your left for a belted kingfisher in flight. As you continue, cliff and barn swallows can be found darting across the skies around the forebay just beyond the bathrooms to the right. In the spring and summer, be sure to look out for their mud nests on the linings of the small building near the San Antonio Road entrance. In the later stages of nesting, small fledglings can be seen waiting outside the nest for parents to swoop in with food.

Just beyond the swallow-dense area, you approach the Charleston Slough to your right. Here, we’ve seen tons of awesome shorebirds: long-billed curlews, American avocets, black-necked stilts, marbled godwits, willets, and many more in large numbers. To your left, scan the browning reeds for unusually-shaped clumps. These “clumps” are most likely black-crowned night herons.

Along your walk, check out the edges of the water for great egrets and snowy egrets. Various species of waterfowl can also be found here, depending on the season. In the distance, you may be lucky to see northern harriers – recognizable by the white patch on their rumps (just above their tail on the top side of the bird).

As if the amazing waterbirds and raptors weren’t enough, peek in the vegetation dotting the sides of the path for smaller songbirds. We’ve seen all kinds of sparrow species, house finches, and the occasional yellow-rumped warbler.

Grab your notebooks and binoculars – there’s a world of discovery at the Palo Alto Baylands!

Park History

At 1,940 acres, the Palo Alto Baylands Nature Preserve is one of the largest protected marshland habitats in the San Francisco Bay Area. The area itself has a history in waste disposal, from landfill to recycling plant. In 2012, these operations were shut down.

Visit the Park

Please note that there is no entrance fee to enter the park. Dogs are allowed on leashes.

When visiting, we recommend starting at the entrance near San Antonio Road.

Here are some helpful resources to help plan your visit: