Alerts and Closures

Temescal East Shore Trail Closure

Temescal's East Shore Trail will be closed from July 17, 2025 - July 23, 2025 due to trail work/paving repairs taking place in the Beach House area.

Lake Temescal Upper Trail Closure
The Temescal Upper Trail has been temporarily closed due to a yellowjacket nest.   Updated July 12, 2025.

Delays and Caution Advised
Trail work using heavy equipment is active on Brandon Trail between the Day Use Area on Marciel Road and the Redwood Canyon Public Golf Course. Expect delays and use caution in the area.   Updated July 12, 2025.

Mission Peak Trail Closure

Some trails will be closed at Mission Peak Regional Preserve from July - October 2025 for gas system upgrades. See map for more information

Trail Closure

Iron Horse Regional Trail in Walnut Creek from Ygnacio Valley Road to Walden Road will be closed July 21, 2025 - August 7, 2025 for trail repaving.

Isherwood Staging Area

Isherwood staging area will be closed Saturday, August 2, 2025 & Sunday August 3, 2025 ALL DAY.  Parking is available at Quarry Lakes Regional Park for $5 per vehicle.

Trail Closure - Contra Costa Canal Trail
The Contra Costa Canal Trail connection at Heather Farms Park in Walnut Creek to the Ygnacio Canal Trail will be closed by the City of Walnut Creek as of July 7, 2025 for trail repair. This closure will be from N. San Carlos Dr to Marchbanks Dr. If you would like more information on this project please reach out to Mike Vickers at vickers@walnutcreekca.gov.  Updated July 12, 2025.

Carquinez Strait Area Closures

Due to paving and parking area improvements Bull Valley staging area will be closed July 8 - 25, 2025.

The access road to Eckley Pier will be closed Monday - Friday with vehicle access available on Saturdays and Sundays. Please pardon our mess while we make these improvements.

Intermittent Trail Closure

Grizzly Peak Trail will be intermittently closed between the Redwood Fire Trail (west side) and Tower Trail (east side) for fuels reduction tree work beginning June 23 through August 29, Monday through Friday 7 a.m. - 4 p.m.

Grizzly Peak Blvd. will experience intermittent traffic delays during that same time period.

More information: Fuels Treatment Overview - Grizzly Peak Strategic Fuel Break Collaboration (PDF)

Trail Closure
Selby Trail from Wildcat Canyon Road to Central Park Drive is closed due to storm damage. Updated July 12, 2025.

Trail Closure Notice

A section of the Marsh Creek Trail (from Cypress trail head to where it meets Big Break Trail) will be expected to be closed for erosion repairs from July 1, 2025 to October 1, 2025.

See attached map for more details. The closed trail area is highlighted in yellow.

Trail Width Restrictions
Pacific Gas and Electric will be conducting vegetation management along the Lafayette Moraga Trail, in select areas from Oliveira Lane to the Lafayette Community Center in Lafayette. Trail width will be restricted during periods of brush removal. Updated July 12, 2025.

Delays and Restricted Trail Access
The Town of Lafayette will be installing crosswalk safety improvements at South Lucille Lane and across from the Lafayette Community Center on St. Mary's Road during late May and mid June. There will be delays and restricted Trail access at these locations during construction. Updated July 12, 2025.

Construction Notice - Intermittent Closures
Construction is starting for the Uplands Facilities Improvements Project and North Dock Repair. Impacted areas include: West Shore Picnic Areas, East Shore Parking Area, and intermittent trail closures on the West Shore Trail near Channel Point and the north fishing dock. Updated July 12, 2025.

Feeding Animals

Feeding animals at Little Farm is allowed only as part of a staff-led program.

Trail Closure - Contra Costa Canal Trail
The pavement replacement work has begun on the Contra Costa Canal Trail from Lusherm Court to Cherry Lane in Walnut Creek. While the replacement is being performed, this section of Trail will be closed. The approximate completion will by mid-July. Updated July 12, 2025.

Boil Water Advisory
NOTICE TO VISITORS OF PIEDMONT STABLES: The drinking water system serving Piedmont Stables is currently under a Boil Water Advisory. For more information please refer to: Piedmont Stables Water System Boil Water Notice (PDF).   Updated July 12, 2025.

 Tassajara Ridge Closure

The trail between Charbray Street and the Tassajara Ridge is closed to protect natural resources. It will be closed until Sept. 1, 2025.

ATTENTION: Water Quality Improvement Project At Lake Temescal Underway In Spring Of 2025
More information (PDF) Updated July 12, 2025.

Partial South Parking Lot Closure
The South Parking Lot of Temescal will be partially closed off starting July 1, 2025 and access will be restricted due to annual weed abatement/park maintenance.  Updated July 12, 2025.

Point Pinole - Trail Closure
The Bay Trail east of the Atlas Bridge entrance is closed due to a large sinkhole developing between the Union Pacific Railroad tracks and the San Francisco Bay Trail corridor. There is no timeline for reopening. Updated July 12, 2025.

Introduction of a New Invasive Species: Golden Mussels

NOTICE: Upcoming changes to watercraft inspections starting May 7, 2025 due the invasive Golden Mussel, which has recently been identified in North America. KNOW BEFORE YOU GO, visit the Invasive Mussels Page for more information on current inspection procedures.

Del Valle Regional Park is open with limited amenities

• The Marina Store is open between 6 a.m. and 8 p.m. daily to purchase bait, tackle, fishing licenses, snacks, and drinks.
• The Camp Store is open 4 p.m. to 8 p.m. on Fridays; 8 a.m. to 8 p.m. on Saturdays; and 8 a.m. to 12 p.m. on Sundays.
• Boat rentals (motorboats, patio boats) are on a first-come, first-served basis, weather permitting. 
  • Monday through Friday: Sunrise and 3:45 p.m.; boats must be returned by 6 p.m. 
  • Saturday, Sunday, and holidays: Sunrise and 4:45 p.m. with boats due back by 7 p.m.
• Use caution on storm-damaged trails. Signs are posted.
• Construction equipment/noise may be present during normal working hours.
• The Visitor Center is open. See hours below.

The following amenities remain closed:

• The Swim Beach Food Concession remains closed until further notice.
• Entire Campground is opened with the exception of a few sites located in Lower Phase 2. These sites are under repair. Please contact Reservations if you have questions about cancellations. 
  Call 1-888-327-2757, option 2. *For Canadian residents, please use 510-544-2707.

Shoreline Center

**MLK SHORELINE CENTER TEMPORARY CLOSURE**
The Shoreline Center is temporarily closed for NEW RESERVATIONS AND TOURS.
We look forward to sharing a reopening date with you once that has been determined.
Please check back here for updates in Fall 2025.

Del Valle WEST Swim Beach Water Quality Conditions

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

No Water

Due to a Contra Costa Water District (CCWD) line break, there is currently no water available at Eckley Pier. CCWD does not have an estimate for when water service will be restored.

Del Valle EAST Swim Beach Water Quality Conditions

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

Dry Creek Garden Closures
Due to storm damage Dry Creek Garden is closed until further notice.  Updated July 12, 2025.

Brazilian Room Open House

Due to the fully booked event schedule, tours of the Brazilian Room will not be available outside of Open House. For a full schedule of Open House dates and attending Approved Caterers please see the Brazilian Room Open House Schedule linked below.

• Brazilian Room Open House Schedule

Rainbow Lake Water Quality Conditions

• A Caution Advisory is posted at Rainbow Lake for blue-green algae. See Blue-Green Algae Information for additional details 

Storm Damaged Trails

• Brandon Trail: between Horseshoe Trail and Stone Bridge 300 feet is inaccessible to equestrians. Please plan alternative routes.
• Willowview Trail is closed.
• Redtail Trail is closed between Brandon Trail and Grass Valley Trail.

Area Closure
The Greathouse Visitor Center and mines are Temporarily Closed. Please check back for updates on reopening dates. Mine tours are unavailable until further notice. Weather permitting, staff is available by the upper parking lot with park information and educational activities Fridays, Saturdays and Sundays 10am-2pm. Programs and walks are still being offered, please click VIEW EVENTS button in the Black Diamond Mines Naturalist Programs box below for details. Updated July 12, 2025.

Emergency Storm Repairs

Please expect delays along the SF Bay Trail at Robert W. Crown Memorial State Beach due to substantial shoreline erosion on the corner of Shoreline Dr. and Westline Dr. Crews are working to prevent further damage, and work will continue on an as-needed basis.

Crown Beach Regional Shoreline Water Quality Conditions

• Swim Beach Conditions [PDF]
• Monitoring Program 

Bathroom Construction Delay

Construction of replacement bathroom facilities at Crown Beach along Shoreline Drive at Grand Street has been delayed. The Park District is working with the City of Alameda to restart construction as soon as possible.

No Open Fires or Barbecues

No open fires or barbecues of any type. Gas-fueled stoves are permitted at Alameda Grove and School Camp only.

Drinking Fountain Unavailable - Riverwalk Staging Area

The drinking fountain at Riverwalk just downstream of the BART tracks is not available. Drinking fountains are available upstream at Niles Staging Area and downstream at Beard Staging Area.

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.

Trail Closure Notice

Sections of the following trails are temporarily closed to safeguard critical habitat in the area:

• Back Ranch Loop Trail - Closed south of the intersection of Chorus Frog Trail
• Goldfinch Trail - Closed south of intersection of Chorus Frog Trail
• Chorus Frog Trail - Closed east of intersection with Tree Frog Trail

Closure is in effect until August 31, 2025.

Lake Anza at Tilden Park Water Quality Conditions

• Swimming is open every day.
• There is a Caution Advisory posted for blue-green algae. See Blue-Green Algae Information for additional details.
• Swim Beach Conditions [PDF]
• Monitoring Program 

Shadow Cliffs Arroyo Water Quality Conditions

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

Trail Partial Closure

Wildcat Creek Trail at the Richmond Parkway undercrossing is currently experiencing seasonal flooding. This trail will be impassable until flood waters recede sometime during the summer of 2025.

Shady Glen Trail Closure
The Shady Glen Trail is currently closed. Updated July 12, 2025.

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. 

Swim Lagoon Closed Until Further Notice

Due to ongoing renovations, the Contra Loma swim lagoon is closed until further notice.

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 - No Water available (use Stromer Springs)
• Stromer Springs - Water available
• Stewart's Camp - Water available

Trail Closure
Stone Corral Trail between Coyote Trail and the junction of Highland Ridge Trail is closed due to storm damage. Updated July 12, 2025.

Trail Closure
Hardy Canyon Trail (Round Valley Regional Preserve) is closed until further notice due to storm damage.  Updated July 12, 2025.

Skyline Trail Partial Closure

Skyline Trail is closed between Fish Ranch Road and Old Tunnel Road Staging Area due to a mudslide. View Map. 

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.

Storm Damaged Trail Closures
Garin Woods Trail, Ziele Creek Trail, and South Fork Trail are currently closed due to storm damage. Other trails have also sustained some storm damage. Use caution while accessing all open trails in Garin and Dry Creek Pioneer. View Map.  Updated July 12, 2025.

Lake View Trail Partially Closed
The Lake View Trail is closed at the cattle pond due to storm damage. View Map.  Updated July 12, 2025.

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 July 12, 2025.

Lake Temescal Water Quality Conditions

• Swimming is open and lifeguards on duty every day from 11am to 6 pm.
• There is a Caution Advisory for blue-green algae posted. See Blue-Green Algae Information for additional details.
• Swim Beach Conditions [PDF]
• Monitoring Program 

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 Spring/Summer 2025 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.

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 Spring/Summer 2025. More information. 

Contra Loma Reservoir Water Quality Conditions

• A Caution Advisory is posted  for blue-green algae. See Blue-Green Algae Information for additional details 

Lake Chabot Water Quality Conditions

• A Danger 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
Right Dock (south side - Doolittle fishing pier) is closed. Pilings are in need of replacement Updated July 12, 2025.

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 Danger 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.

Trail Closure Notice
Lake Trail is closed due to terrain damage.
The section of Lake View Trail below Stanley Blvd is now open. The lower connector trail from the bridge at North Beach that extends up to Lake View Trail will remain closed until storm damage is repaired. Updated July 12, 2025.

Shadow Cliffs Lake Water Quality Conditions

• There is a Caution Advisory posted for blue-green algae is posted at Shadow Cliffs. See the Blue-Green Algae Information page for additional details.
• Swim Beach Conditions [PDF]
• Monitoring Program 

Shinn Pond at Alameda County Trails Water Quality Conditions

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

Horseshoe Lake / Niles Swim Beach Water Quality Conditions

• Niles Swim Beach is closed due to a Danger Advisory for blue-green algae posted at Horseshoe Lake. See Blue-Green Algae Information for additional details.  
• 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.

Big Break Regional Shoreline Water Quality Conditions

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