Hayward Regional Shoreline consists of 1,811 acres of salt, fresh, and brackish water marshes, seasonal wetlands and public trails.

Cogswell Marsh, a 250-acre tidal marsh restoration and enhancement project, was completed in 1980. This area, once restored to tidal action, rapidly became an established saltwater marsh.

Birds: shorebirds, waterfowl, swallows.

Hiking Difficulty: 2

Directions (four options):

Option 1, via 680 South: Take 680 south Take Crow Canyon Exit Take Crow Canyon west to Castro Valley Blvd Take 238 west Take 880 south Take exit 28 onto Winton Ave. Keep right onto Winton Ave. West Go 2.7 miles and turn left Go 70 feet, on your right Option 2, via 680 South: Take 680 south Take 580 west Take 238 west Take 880 south Take exit 28 onto Winton Ave. Keep right onto Winton Ave. West Go 2.7 miles and turn left Go 70 feet, on your right

Option 3, via 280 West: Take hwy 24 west Take 980, which goes directly onto 880 south Take exit 28 onto Winton Ave. Keep right onto Winton Ave. West Go 2.7 miles and turn left Go 70 feet, on your right Option 4, via 24 West: Take hwy 24 west Take hwy 13 south to 580 south Take hwy 238 west to 880 south Take exit 28 onto Winton Ave. Keep right onto Winton Ave. West Go 2.7 miles and turn left Go 70 feet, on your right

Hiking Difficulty codes:
1=Easy, very few hills to climb
2=Moderately Easy, some small hills to climb
3=Challenging, flat land ranging to gentle to some steep slopes
4=Difficult, some very steep hills to climb