18627 Cull Canyon Road
Castro Valley, CA 94546
Toll Free: 888-EBPARKS (888-327-2757), option 3, extension 4523
View Trail Map
Download PDF Map
Open between 5 a.m. and 10 p.m. unless otherwise posted or permitted
March - Nov.
8 a.m. - 10 p.m.
Dec. - Feb.
8 a.m. - 8 p.m.
Swim Lagoon Hours
11 a.m. - 6 p.m.
Click HERE for upcoming events
No fee. No dogs allowed inside fenced swim area.
Grazing in the Parks
Beach Access Fee
See the Swim Facilities page
No reservable campgrounds
1-888-EBPARKS or 1-888-327-2757, press option 2
1-888-EBPARKS or 1-888-327-2757
Cull Canyon Regional Recreation Area
During a closure due to full capacity, guests may not be permitted into the lagoon area until deemed safe by Park staff
About The Park
This popular Castro Valley swimming spot is only a short drive north from Interstate 580 on Cull Canyon Road in Castro Valley.
|Submit Your Photos to the EBRPD Photo Pool|
When the swim area was constructed, a secondary dam was built to provide an inner swimming area complete with sandy beach. Never previously tried, this innovation made the swim area water level independent of the reservoir's, unaffected by summer draw-downs.
The lagoon won the 1966 Governor's Design Award for Exceptional Distinction for Recreational Development in the category of landscape.
The swim complex is open during swim season with lifeguard service. For current hours of operation and lifeguard service schedule, visit the Swim Facilities page.
The swim complex includes a bathhouse, vending machines, and the 1.5-acre swim lagoon. It is ideal for families with small children who will enjoy splashing in the shallows and playing on the white sandy beach. Inside the swim complex there are three additional reservable picnic areas. (Beach access fee to enter swim area.)
There are several reservable picnic areas at the park. For information, call 1-888-EBPARKS1-888-EBPARKS or 1-888-327-27571-888-327-2757, press option 2.
The large area inside the swim complex is also available to rent for parties, receptions, weddings, etc. For information, call 1-888-EBPARKS1-888-EBPARKS or 1-888-327-27571-888-327-2757, press option 2.
The reservoir itself contains bass, catfish, and sunfish. The 360-acre park is a fine place to cool off on a hot summer day, fish, or just relax in the outdoors any time of year.
Cull Canyon also is on the Chabot-to-Garin Regional Trail, which is being developed between the two parks. The trail runs along the east side of Cull Canyon Reservoir, then heads north for six miles through East Bay Municipal Utility District property to EBMUD's Chabot Staging Area on Redwood Road (an EBMUD hiking permit is required for this section, phone 287-0459). From here the Willow View Trail leads into Anthony Chabot Regional Park.
- From I-580 eastbound in Castro Valley, take the Grove Way exit. Turn to the north (left) on Grove Way. Turn left onto Cull Canyon Road and continue to the park entrance on the left hand side.
- From I-580 westbound, take the Castro Valley exit and continue west (left) on Castro Valley Blvd. to Crow Canyon Road. Turn right on Crow Canyon, then left on Cull Canyon Road and continue to the park entrance on the left.
Click the map image below to see an enlarged version.
When the enlarged version of the map opens click on the 'Full Expand' icon in the lower right hand corner of the map to see the 'Actual Size' map.
When the 'Actual Size' map is viewable, you can 'Click-Hold and Drag' the mouse button (left on a PC) to reposition the map, as desired.
'Single-Click' on the 'Enlarged' or 'Actual Size' map to return to the park page.