Contra Loma Regional Park

Until further notice, expect intermittent trail closures on the West Shore Trail near the Northwest Fishing Dock, due to a construction project, replacing the fishing docks. 

Water Quality Notice
Cyanobacteria (blue-green algae) is present in the reservoir, and a Danger advisory is posted at the reservoir. See Cyanobacteria (Blue-Green Algae) Updates for more information.
Notice to Watercraft Owners
Please help keep Invasive Mussels out of our waters. Read more about the Boat Inspections and the Invasive Mussel.
Note: The fees for quagga inspection can be paid with a credit card at the Ventek machine located at the kiosk.

Park Info

Address - Main Entrance:
1200 Frederickson Lane,
Antioch, CA 94509

Park Entrances:
> Main Entrance
> Swim Lagoon
> Boat Launch
> ADA Fishing Dock

Phone Number:
(510) 544-3154
Toll Free: 888-EBPARKS (888-327-2757), option 3, extension 4518

> Trail Map
> PDF Map
> Wayside Panels - Anza

Park Gate Hours
Jan.: 7am-5:30pm
Feb.: 7am-6pm
Mar.: 7am-7pm
Apr.: 6am-8pm
May-Aug.: 6am-8:30pm
Sep.: 6am-8pm
Oct. 1-Nov. 3: 7am-7pm
Nov. 4-Dec. 31: 7am-5:30pm

Parking Fee:
$5 per vehicle; $4 per trailered vehicle. Buses: $25/per bus.
Dog Fee: $2 per dog. Guide/service dogs free
Boating: Boating, kayaking & sailing fees

Swim Hours & Fees
Closed for the 2021 season

Contra Loma Regional Park

About The Park

Contra Loma's 775 acres include an 80-acre reservoir for year-round fishing and a lifeguarded swim lagoon for summertime swimming. Enjoy these attractions along with year-round hiking, biking, and nature study at this Contra Costa County oasis. Alcohol is not permitted.

Boondoggies Beach Cafe at the Contra Loma Swim Lagoon
Open 7 days per week through Labor Day, 11 am to 6 pm.

Wildflower Photo Guide

Park Gate Hours

  • January:  7:00am - 5:30pm
  • February:  7:00am - 6:00pm
  • March:  7:00am - 7:00pm
  • April:  6:00am - 8:00pm
  • May to August:  6:00am - 8:30pm
  • September:  6:00am - 8:00pm
  • Oct 1 - Nov 3:  7:00am - 7:00pm
  • Nov 4 - Dec 31:  7:00am - 5:30pm

Swim Lagoon Public Swim Hours

NOTICE: For hours of operation and lifeguard service schedule, visit the Swim Facilities page.

Park Activities

Contra Loma

The lake's swim lagoon has a sandy beach with restrooms and a concession stand. Shady picnic areas on a green lawn are accessible to people with disabilities. Alcohol is not permitted anywhere in the park. Swimming is permitted in the lagoon only, in the summer when lifeguards are on duty. There is a beach access fee. For fee information and lifeguard schedule, visit the Swim Facilities page. Swim lessons and the Jr. Guard program is held at the lagoon in the summertime. For information, see Aquatic Programs at the Park District's program registration page. Visitors to Contra Loma may launch their own boats. For boat launch information and a schedule of fees, see our Boating and Sailing page. Persons using float tubes must have with them life jackets.

Swim Facilities Capacity Notice
Due to the popularity of swimming at Contra Loma, the swim facility reaches capacity very early on weekends and Holidays. For the safety of the public, once the swim facility capacity is reached (by reservation or first come, first serve basis), there will be no new entries allowed for the remainder of the day. Please take this into consideration when you are planning your visit.

The reservoir contains catfish, black and striped bass, bluegill, trout, and red-eared sunfish for fishing. A Daily Fishing Access Permit is required and can be purchased at the park entry kiosk. Other information on fishing can be found in the Fishing section of this site.

From Contra Loma, there are trail connections to Black Diamond Mines Regional Preserve.

Note: The Contra Costa Water District, which owns the reservoir, requires that all windsurfers and paddle boarders shower a minimum of 2 minutes prior to entering the reservoir and wear at least a short wetsuit. Showers are located outside the restrooms and next to the beach used by windsurfers. Persons using float tubes must wear waders or other wetsuit material to eliminate body contact with the water in the reservoir. People using sea kayaks that self-bail must shower prior to entering the reservoir and wear at least a short wetsuit. Other dry-type kayaks are permissible with the only restriction being no rollovers or other activities that cause body contact with the water.

ADA accessibility iconPark Accessibility

Contra Loma has wheelchair accessible restrooms, drinking fountains, and parking. The south fishing dock is wheelchair accessible and may be reached by paved trail. The shady picnic areas near the lake's swim lagoon are wheelchair accessible. The swim lagoon has an accessible pool lift.

A beach wheelchair, intended to provide a means for wheelchair users to travel around the swimming lagoon, is available for free on a first-come, first-served basis. It requires an assistant to push and may enter the water. For information about the use of the beach wheelchair or pool lift, please contact the park office at 1-888-327-2757, option 3, ext. 4518.

Trail Accessibility Report

West Shore Trail: Download PDF | Download MS Word

To Reach The Park

To reach Contra Loma from Highway 4 in Antioch, exit on Lone Tree Way, go right on Golf Course Road and right on Frederickson Lane to the park.

Trail Map

Click the map image below to see an enlarged version.

Contra Loma Trail Map

Interpretive Panels

CL Butterflies in the Garden


Sunday, December 12, 2021

10:00 AM  -  12:00 PM

Saturday, December 18, 2021

8:00 AM  -  11:00 AM
Winter Bird Count