Overview
Before heading out to parks, review notices below. Some trails, attraction venues, park areas may be temporarily closed -- due to weather or water/algae conditions, park projects, habitat restoration, or repairs and maintenance.
Alert Level | Location | Description |
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Area Closure Posted | Temescal | Area Closure Notice - Temescal
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Area Closure Posted | Temescal | Area Closure Notice - Temescal Parking Lot
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Area Closure Posted | Tilden, Tilden Nature Area | Area Closure Notice - Tilden Nature Area
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Area Closure Posted | Contra Loma | Area Closure Notice - Contra Loma Swim Lagoon
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Danger Advisory Posted | Del Valle | Water Quality Notice - Del Valle Reservoir Cyanobacteria (blue-green algae) is present in the reservoir and a Danger/Closure Advisory is posted. NO SWIMMING is permitted at this time. Keep dogs away from water. See the Cyanobacteria (Blue-Green Algae) Information page for additional details. Swim Beach Conditions [PDF] | Monitoring Program | |
Trail Closure Posted | Point Pinole, Point Pinole Regional Shoreline | Trail Closure Notice - Pt. Pinole Bay Trail - Posted on 5/18/2022
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No Advisory Posted | Tilden | Water Quality Notice - Lake Anza at TildenCyanobacteria (blue-green algae) is present in lake, but no toxins have been detected recently. There are no advisories posted at the lake. As a precaution, keep dogs away from water. See the Cyanobacteria (Blue-Green Algae) Information page for additional details.No Swimming. The Swim Facility/Area is CLOSED for the 2022 swim season. What is covering Lake Anza? Click here to learn more about Azolla.Swim Beach Conditions [PDF] | Monitoring Program | |
Caution Advisory Posted | Lake Chabot | Water Quality Notice - Lake ChabotCyanobacteria (blue-green algae) is present at the lake and toxins have been detected recently. A Caution Advisory is posted around the lake. See the Cyanobacteria (Blue-Green Algae) Information page for additional details.Swimming is never permitted at Lake Chabot. |
Caution Advisory Posted | Temescal | Water Quality Notice - Lake TemescalCyanobacteria (blue-green algae) is present in the lake, but all toxins detected recently have been below state advisory thresholds. There are no current cyanobacteria advisories. Keep dogs away from water. See the Cyanobacteria (Blue-Green Algae) Information page for additional details. The Swim Facility/Area is OPEN.Swim Beach Conditions [PDF] | Monitoring Program | |
Area Closure Posted | Leona Canyon | Area Closure Notice - Remedial Action at Leona Canyon - Updated on 5/14/2022
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Trail Closure Posted | Point Isabel | Trail Closure Notice - The Point Isabel San Francisco Bay Trail - Posted on 5/11/2022
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Area Closure Posted | Roberts | Area Closure Notice - Redwood Bowmen Archery Club Range - Posted on 5/11/2022
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Area Closure Posted | Tilden | Area Closure Notice - Tilden Environmental Education Center - Posted on 5/3/2022
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Area Closure Posted | Roberts | Area Closure Notice - Roberts Pool - Posted on 4/23/2022
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Trail Closure Posted | Shadow Cliffs | Trail Closure Notice - Lake Trail - Updated on 4/26/2022
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Area Closure Posted | Shadow Cliffs | Area Closure Notice - Shadow Cliffs - Updated on 4/26/2022Swimming
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Danger Advisory Posted | Quarry Lakes | Water Quality Notice - Horseshoe Lake / Niles Swim BeachCyanobacteria (blue-green algae) is present in lake and toxins have been detected recently. A Danger Advisory for cyanobacteria is posted at Horseshoe Lake and Niles Beach. No body contact with water is allowed and Keep dogs away from water. See the Cyanobacteria (Blue-Green Algae) Information page for additional details.Swim Beach Conditions [PDF] | Monitoring Program | |
Trail Closure Posted | Claremont Canyon | Trail Closure Notice - Stonewall-Panoramic Trail - Posted on 4/25/2022Beginning Monday, May 2 through mid July:
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Danger Advisory Posted | Quarry Lakes | Water Quality Notice - Lago Los Osos at Quarry LakesCyanobacteria (blue-green algae) is present and a Danger Advisory is posted at Lago Los Osos. Swimming is never allowed and water contact is not permitted at Lago Los Osos. Keep dogs away from the water. See the Cyanobacteria (Blue-Green Algae) Information page for additional details. Swimming is never allowed and water contact is not permitted at Lago Los Osos. |
No Advisory Posted | Big Break | Water Quality Notice - Big Break Regional ShorelineCyanobacteria (blue-green algae) is present at the shoreline, but toxins detected recently have been below California advisory guidelines. There are no advisories posted at this time. See the Cyanobacteria (Blue-Green Algae) Information page for additional details. |
Park Rule Violations
To report an Emergency or Crime/Suspicious Activity in Progress,
call 911 or (510) 881-1121 from a cell, 24 hours a day.
To report Non-Emergency Park Rule Violations such as reckless bike/skate/scooter riding, failure to properly leash or control pets, and improper trail usage such as eBikes or mountain bikes on restricted trails, please call our Non-Emergency Public Safety Dispatch at (510) 881-1833, 24 hours a day, or submit a Park Watch Report online at the link below.
For Non-Emergency Trail Safety Hazards or Damaged Trails/Facilities, locate a park ranger or call Park Operations at (510) 544-2510 (Mon-Fri, 8:30am-5pm, voicemail available after hours or call the Non-Emergency Dispatch line above).