Alerts and Closures

Cogswell Bridge Construction

The longer bridge towards the north of Cogswell Marsh will be closed due to construction from September 24 through October 5, 2023, during the following times:

• Sept 24-25: 12am - 8am
• Sept 26: 1am - 9am
• Sept 27: 1am - 9am
• Sept 28: 2am - 10am
• Sept 29; 3am - 11am
• Oct 1-2: 5pm - 1am
• Oct 2-3: 6pm - 2am
• Oct 3-4: 7pm - 3am
• Oct 4-5: 8pm - 4am

The bridge will reopen when construction is completed for the day. Please follow all signage and watch for mowing vehicles on the trail. 

Flood Damage Repairs

Construction to mitigate flood damage at Del Valle Marina will begin on Monday, September 11, and continue through September 30. 
Fishing will be impacted at the Marina and Hobie Point due to equipment. No trails or amenities will be closed.

Fuels Management Project

Deer Canyon Trail will be closed from September 11, through September 25, for tree thinning work along the trail.

Closure for Paving Repairs (Concord)

The Iron Horse Trail will be closed for paving repairs from Monday, September 25 through Wednesday, October 11 between Concord Ave and Marsh Dr in Concord.

Hiking with Dogs

Thinking about coming out for a hike at Black Diamond? Even into the Fall, the days can get quite hot. Please be prepared, especially when hiking with your furry friends. Generally, at temperatures above 89°F, most dogs are at risk of heat stroke, and you should avoid walking your dog when it's above 90°F. For some dogs, outdoor activity at even lower temperatures can be too hot.

• Check the weather - Start early (before 11am) or late (after 4pm)
• Carry enough water for you and your dog - remember, dogs don’t sweat like humans do, so they’re at higher risk of overheating. Check on your dog throughout your hike and take frequent water breaks. Notice signs of overheating—if your dog is excessively panting, drooling, or vomiting, move to a cooler area and give your dog water. 
• Know the signs of Heat-related Illness - see our Heat Safety Tips. View Safety Tips for You and Your Dog.

Trudeau Center Parking Lot Closure

Trudeau Center Parking Lot will be closed from Monday, September 18 through Monday, September 25 due to construction.

Radke Martinez Shoreline Partial Closure

A portion of the Shoreline Park will be closed from Tuesday, September 5 through November 2023, for irrigation replacement work. View Map of Closed Area.
All facilities within the closed area including the parking lot, restrooms, playgrounds and picnic areas will be unavailable during this time. Access to the Pickleweed Trail, Grangers’ Wharf Trail and Killdeer Trail between Grangers’ Wharf and Pickleweed, will remain open during construction.
Alternative parking and restrooms are available at Grangers’ Wharf and Waterfront Park, view Park Map.
The new irrigation system will save water by significantly improving watering efficiency in the park.

Removal of fire damaged trees

The Scenic Fire Restoration and Resiliency project will begin on Wednesday, September 6, 2023. To facilitate the safe removal of fire damaged eucalyptus trees, Carquinez Scenic Overlook Trail will be closed weekdays between 7am-5pm. The trail will be accessible at weekends.

Lake Anza Closed to Swimming
Lake Anza is closed to swimming as of Thursday, August 17, 2023. The lake is experiencing significant aquatic weed coverage that poses swim safety challenges, including reduced water ­­­­­­visibility and possible weed entanglement. To learn more about the aquatic weed covering Lake Anza, view the “What is Covering Lake Anza?” brochure.
Information on other swimming options is available at www.ebparks.org/swimming. Updated September 22, 2023.

Thurgood Marshall Regional Park

Thurgood Marshall Regional Park is closed with no public access, however, there are occasional public tour events. Check for upcoming tours or events at Calendar of Events - Thurgood Marshall.

Iron Horse Trail Overcrossing Construction - San Ramon

The north side of the Iron Horse trail adjacent to Bollinger Canyon Road is closed during the construction of an overcrossing, a pedestrian/bike detour is in place. View Map. (At a later date, closure of the south side of the Iron Horse trail adjacent to Bollinger Canyon Road will also be implemented; a pedestrian/bike detour will be in place.)
The overcrossing project began on July 31, 2023, and is expected to take 18-24 months to complete. View Project information.

Storm Damage Repairs

East Bay Regional Park District is aware of storm damage causing limited emergency vehicle access, we are working to plan and prioritize repairs alongside the park's annual maintenance needs. 
Wildcat Canyon Creek Trail between Bonita Trail and Belgum Trail and Belgum Trail will be closed for road repair work starting Monday, September 25. Repairs are anticipated to take up to three weeks to complete. Park visitors are encouraged to take alternative routes around the work site.

Watercraft Inspections

• Please help keep invasive mussels out of our water.
• Quagga Mussel watercraft inspections are mandatory.
• Read more about mandatory watercraft inspections and the Invasive Mussel.
• Fishing from shore is also allowed.

Parking Notice

Due to high visitation, Castleridge Trailhead parking may be limited. Consider visiting at less busy times or using the now-reopened Foothill Staging Area or new Tyler Ranch Staging Area.

Del Valle Regional Park is open with limited amenities

• Bring your own drinking water. Water at the park may be intermittent.
• The Marina Store is open daily with modified hours for boat rentals, first come first served, rentals for motorboats, patio boats and canoes can be purchased between 8am and 3pm; boats must be returned by 5pm. The store is open between 8am - 6pm to purchase bait, tackle, license sales, and snacks and drinks.
• The Camp Store is open Fridays from 1pm to 9pm and Saturdays from 8am to 9pm.
• Use caution on storm-damaged trails. Signs are posted.
• Construction equipment/noise may be present during normal working hours.
• Kayaks and paddleboards can be rented at the east beach, open Weekends through September. Visit OutbackAdventures.com for rental information.

The following amenities remain closed:

• The Visitor Center is currently closed.
• The Swim Beach Food Concession remains closed until further notice.
• Del Valle Campground remains closed until further notice, due to severe winter storm damage. Extensive repairs are needed. Campsites are being assessed and will be reopened based on safety conditions. A small, upper portion of the campground, convenience cabins, equestrian campsites, and some group campsites have reopened. Please contact Reservations if you have questions about cancellations. 
  Call 1-888-327-2757, option 2. *For Canadian residents, please use 510-544-2707.

Damaged Trail
The intersection of Briones Crest Trail/ Mott Peak Trail and Briones Crest Trail/ Lagoon Trail is currently damaged but passable with care. Barricades and cones have been posted on both ends of the fire trail to warn park users. Please follow all signage and use caution. Updated September 22, 2023.

Trail Closure
Upper Seafoam Trail is closed due to downed trees. Updated September 22, 2023.

Swim Lagoon Closed

Contra Loma Swim Lagoon is CLOSED for the 2023 swim season due to required maintenance and safety repairs. The District is evaluating potential structural repairs and changes to the lagoon, including removing the sand entry, bringing the facility up to code, and cost estimates.

The Park District has partnered with the Ambrose Parks and Recreation District to provide alternative swim access and programs at Ambrose Aquatic Center in Pittsburg. Visit www.ambroserec.org/ambrose-aquatic-center for more information.

Temporary parking closures due to capacity

Due to increased visitation, primarily on Saturday and Sunday, vehicle access to Coyote Hills may close temporarily. Vehicle access to the park typically reopens when capacity is available, but expect very extended wait times to enter. Additional Parking is available at Dumbarton Quarry Campground.

Please submit any questions or comments using our Contact Us Form.

Water Availability Update
All water is non-potable (filter, treat, or boil for human consumption).

• Eagle Springs - Water available
• Backpack Camp - Water available
• Doe Camp - Water available
• Maggie's Half Acre - Water available
• Boyd Camp - Water available
• Stromer Springs - Water available
• Stewart's Camp - Water available

Road Closure
Wildcat Canyon Road is currently closed from Camino Pablo to Inspiration Point. Please use Grizzly Peak Blvd to access the park as it is inaccessible via Wildcat Canyon Road. Updated September 22, 2023.

Tassajara Creek/Ridge Trail Section closed to protect natural resources

An approximate 2/3 mile segment of trail between Charbray Street and the Tassajara Ridge has been closed to protect natural resources. The trail is anticipated to reopen in Fall 2023.

No horse-trailer parking at Proctor Staging Area until further notice.
The exit at Proctor Staging area has collapsed and is closed until further notice. The entrance is now serving as a one-lane, entrance and exit. Unfortunately, the entrance is too narrow to allow horse trailers to exit the staging area.  Updated September 22, 2023.

Trail Closure
Stone Corral Trail (from Coyote Trail to Morgan Territory Road) is closed due to storm damage. Updated September 22, 2023.

Del Valle WEST Swim Beach Water Quality Conditions

• The WEST swim beach has no advisories posted for blue-green algae. See Blue-Green Algae Information for additional details.
• Swim Beach Conditions [PDF] 
• Monitoring Program 

Hardy Canyon Trail Closed
Hardy Canyon Trail is closed until further notice due to storm damage.  Updated September 22, 2023.

Trail and Area Closures
Due to recent storm damage, the Park is not accessible via Redwood Rd from I-580 westbound in Castro Valley. Access via Redwood Rd from Skyline Blvd. The following trails and staging areas remain closed:
Trails Closed:

• Brandon Trail Stone Bridge to Horseshoe Trail - trail impassable due to a failed culvert
• Escondido Trail
• Mirador Trail 
• Redtail Spur Trail
• Willowview Trail

Skyline Trail Partial Closure
Skyline Trail is closed between Fish Ranch Rd and Old Tunnel Road staging area due to a mudslide. View Map.  Updated September 22, 2023.

Storm-damaged Trail
A culvert on Leona Trail near Artemisia Trail has failed and is impassible. The trail is not closed as the park can still be accessed from both sides, but the trail no longer connects and the area should be avoided for further landslide issues. View Map. Updated September 22, 2023.

Storm Damaged Trail Closures
Garin Woods Trail and Ziele Creek Trail are currently closed due to storm damage.
High Ridge Loop Trail has sustained damage but is open to pedestrian use. South Fork Trail is open to hiking only. Meyers Ranch Trail is currently open with temporary repairs. Other trails have also sustained some storm damage. Use caution while accessing all open trails in Garin and Dry Creek Pioneer.  Due to storm damage Dry creek garden is closed until next year.  View Map.  Updated September 22, 2023.

Bay Trail Closed
The Bay Trail is closed at Bayfront and Pinole Shores due to storm damage.  Updated September 22, 2023.

Lake View Trail Partially Closed
The Lake View Trail is closed at the cattle pond due to storm damage. View Map.  Updated September 22, 2023.

Del Valle EAST Swim Beach Water Quality Conditions

• The EAST swim beach has no advisories posted for blue-green algae. See Blue-Green Algae Information for additional details.
• Swim Beach Conditions [PDF] 
• Monitoring Program 

Trail Closure
Sycamore Trail is closed due to a landslide near the halfway point. View Map.  Updated September 22, 2023.

Lafayette Staging Area Closed
Lafayette Ridge Staging Area is closed due to significant landslides. All other park entrances are open. View Map.  Updated September 22, 2023.

Old Moraga Ranch Trail Partially Closed
The Old Moraga Ranch Trail is closed from Sanders Drive to Sanders Ranch Road, due to a landslide.  Updated September 22, 2023.

Trails Closures
The following trails within the park are currently closed:

• West Ridge Trail between Golden Spike and Bridle Trail is closed 
• Toyon Trail is closed

Lake Temescal Water Quality Conditions

• The lake is CLOSED to swimming
• There is a Danger advisory for blue-green algae posted. See Blue-Green Algae Information for additional details.
• Swim Beach Conditions [PDF] 
• Monitoring Program 

Lake Anza at Tilden Park Water Quality Conditions

• Lake Anza has a Danger/Closure Advisory posted for blue-green algae. See Blue-Green Algae Information for additional details.
• Swim Beach Conditions [PDF] 
• Monitoring Program 

Trail Closures - Tilden

Selby Trail will be closed for a fuels reduction project Mon-Friday in late August-early September between Shasta Drive and Ajax Place. Trail will be open weekends. Large equipment and trucks will be operating in the area. Please consider alternative trails, exercise caution and follow all signage in the area. Visit the Fuels Management page, under entry TI011-012, for more information.

Quarry Trailhead and picnic site will be closed for a fuels reduction project Mon-Friday in mid-September. Trailhead will be open weekends during the project. Estimated dates are September 11-18 and 21-25 but closure may be earlier or later. Large equipment and trucks will be operating in the area. Please consider alternative trailheads, exercise caution and follow all signage in the area.

The upper 0.43 miles of Laurel Canyon Trail is closed until further notice due to storm damage. Detour Map. View Map. 
Grizzly Peak Trail is closed to equestrian traffic due to storm damage.
Selby Trail is closed at the connector trail to the Merry-Go-Round.  Updated September 22, 2023.

Coyote Hills Parking Lot Project

The gravel parking lot located at Paseo Padre Parkway and Patterson Ranch Road is closed. View Map.
The existing lot will be replaced by a paved 100-car lot with shade, flush toilets, landscaping, EV charging, bus parking, picnic tables, and wildlife overlooks. The new parking lot is due to open in late 2023/early 2024 and will be located further up Patterson Ranch Road and will have better pedestrian and vehicle circulation. 
To accommodate early park users, Coyote Hills staff will open the gates to the park at 7am.

Ferry Point Pier Removal Project - Miller Knox

The East Bay Regional Park District owns and operates Miller/Knox Regional Shoreline, including the historic Ferry Point Pier which extends into the San Francisco Bay. The wooden pier is over 100 years old and damaged and must be removed for safety.
Ferry Point Pier Project Description and FAQs (PDF) | Ferry Point Pier Project Description and FAQs (Spanish) (PDF)

Construction Notice - Coyote Hills Restoration and Public Access Project
Trails may be re-routed periodically as needed. There will be a traffic lane shift along Patterson Ranch Road - please use caution. The project is expected to open in late 2023/early 2024. More information.  Updated September 22, 2023.

Trail Closure Notice - Tuibun Trail

The Tuibun Trail, between Paseo Padre Parkway and the kiosk, has been re-routed due to construction work taking place through Fall 2023. View Map.

Contra Loma Reservoir Water Quality Conditions

• There is a Danger Advisory for blue-green algae posted at the reservoir at this time. See Blue-Green Algae Information for additional details.
• Note: The Swim Lagoon is closed for the 2023 season due to ongoing maintenance. Blue-Green Algae issues do NOT affect the Contra Loma Swim Lagoon water quality.

Lake Chabot Water Quality Conditions

• A Caution Advisory for blue-green algae is posted. See Blue-Green Algae Information for additional details.
• Swimming is never permitted at Lake Chabot.

Area Closure Notice - Martin Luther King Jr. Regional Shoreline

• Shoreline Center is closed
• Right Dock (south side) is closed. Pilings are in need of replacement

Keller Beach at Miller/Knox Regional Shoreline Water Quality Conditions

• Swim Beach Conditions [PDF]
• Monitoring Program

Area Closure Notice - On-Going Soil Delivery and Grading Work

This project is part of the Park District’s ongoing efforts to build up the topography of the park to meet the standards of the District’s Oyster Bay Land Use Plan Amendment adopted in 2013. More information.

Lago Los Osos at Quarry Lakes Park Water Quality Conditions

• A Caution Advisory is posted at Lago Los Osos. See Blue-Green Algae Information for additional details.
• Swimming is never allowed and water contact is not permitted at Lago Los Osos.

Area Closure Notice - Soil Testing
Recent soil testing of the entire landfill detected lead in specific, localized areas around the perimeter of the north side of the park (the portion of the park located across the Hoffman Channel bridge). For your continued safety, the areas are fenced off from all public/pet access. The Park District, under oversight of the San Francisco Bay Regional Water Board, is developing a plan to restore these areas.  Updated September 22, 2023.

Trail Closure Notice - Lake Trail
Lake Trail is closed due to terrain damage. Updated September 22, 2023.

Shadow Cliffs Lake Water Quality Conditions

• There are no current advisories for blue-green algae posted. See the Blue-Green Algae Information page for additional details.
• Swim Beach Conditions [PDF]
• Monitoring Program 

Trail Closure Notice - Trail & Staging Area
The Wilcox Station Staging Area and McCosker Loop Trail will be closed for construction, from June 2020 to Winter 2023, for creek restoration and public access enhancements. The project restores over 3,000 feet of creek habitat, including daylighting 2,800 feet, previously culverted underground.  Updated September 22, 2023.

Shinn Pond at Alameda County Trails Water Quality Conditions

• A Caution Advisory for blue-green algae is posted. See Blue-Green Algae Information for additional details.
• Swimming is never allowed at Shinn Pond.

Horseshoe Lake / Niles Swim Beach Water Quality Conditions

• There are no current advisories posted for blue-green algae. See Blue-Green Algae Information for additional details.
• Swim Beach Conditions [PDF] 
• Monitoring Program

Trail Closure Notice - Lafayette-Moraga Regional Trail
Until further notice, the Valle Vista to Westchester section of the Lafayette Moraga Trail is closed.  This closure only affects the last half-mile on the Moraga end. The remaining 7 miles from Lafayette into Moraga is open for normal trail activity. Updated September 22, 2023.

Reporting Swimmer's Itch

To report cases of Swimmer's Itch please call Alameda County Environmental Health (510) 567-6700 or East Bay Park's Water Management 510-544-2328

Trail Closure Notice - Carquinez Overlook Trail
The northern spur of the Carquinez Overlook Trail that runs through the Eucalyptus grove is closed due to hazardous trees and unsafe trail conditions.
The Access road from the end of Prospect Ave is closed due to hazardous trees and unsafe trail conditions.
Map of trail closures.  Updated September 22, 2023.

Crown Beach Regional Shoreline Water Quality Conditions

• Swim Beach Conditions [PDF]
• Monitoring Program 

Trail Closure - Briones to Las Trampas Trail
The Briones to Las Trampas Trail from Golden Gate Way to Moraga Blvd. in downtown Lafayette is closed until further notice. Updated September 22, 2023.

Big Break Regional Shoreline Water Quality Conditions

• There are no current advisories posted for blue-green algae at Big Break. See Blue-Green Algae Information for additional details.

Community Showcase of Newly Renovated Pool

Please join us for a special community showcase at the newly renovated Roberts Pool on Saturday, September 30 and Sunday, October 1. More info.