Overview
Know before you go! Review alerts/notices below before heading out to parks. Some trails, park areas, swim facilities, may be temporarily closed -- due to weather or water/algae conditions, park projects, habitat restoration, or repairs and maintenance.
| Alert Level | Location | Description |
|---|---|---|
Extreme Fire Danger Posted | EXTREME Fire Danger in Effect for Parks in SW Region on Sunday, June 26. Follow All Restrictions Below.
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Park Closure Posted | Pleasanton Ridge | Park Closure Notice - Pleasanton Ridge Regional Park
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Area Closure Posted | Carquinez Strait | Area Closure Notice - Carquinez Strait Bull Valley Staging Area and Eckley Pier
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Caution Advisory Posted | Temescal | Lake Temescal Water Quality ConditionsCyanobacteria (blue-green algae) is present in the lake and toxins have been detected recently. There is a Caution Advisory posted for cyanobacteria. 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 | |
Trail Closure Posted | Trail Closure Notice - San Pablo Bay Trail
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Trail Closure Posted | Trail Closure Notice - Delta de Anza
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Water Warnings Posted | Miller/Knox | Keller Beach at Miller/Knox Regional Shoreline Water Quality ConditonsKeller Beach is OPEN for swimming.Swim Beach Conditions [PDF] | Monitoring Program | |
No Advisory Posted | Tilden | Lake Anza at Tilden Park Water Quality ConditionsCyanobacteria (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 | Quarry Lakes | Horseshoe Lake / Niles Swim Beach Water Quality ConditionsCyanobacteria (blue-green algae) is present in lake and low-level toxins have been detected recently. A Caution Advisory for cyanobacteria is posted at Horseshoe Lake and Niles Beach. Swimming is allowed, but Keep dogs away from water. See the Cyanobacteria (Blue-Green Algae) Information page for additional details.Swim Beach Conditions [PDF] | Monitoring Program | |
Caution Advisory Posted | Quarry Lakes | Shinn Pond at Alameda County Trails Water Quality ConditonsCyanobacteria (blue-green algae) is present and a Caution Advisory is posted at Shinn Pond. Due to the presence of toxic algae in the pond, please keep dogs away from the water. See the Cyanobacteria (Blue-Green Algae) Information page for additional details. Swimming is never allowed at Shinn Pond. |
No Advisory Posted | Contra Loma | Contra Loma Reservoir Water Quality Conditions Cyanobacteria (blue-green algae) is present in the reservoir but all toxins detected recently have been below California state advisory thresholds. There are no current cyanobacteria advisories. See the Cyanobacteria (Blue-Green Algae) Information page for additional details.Note: Cyanobacteria issues do NOT affect the Contra Loma Swim Lagoon water quality. |
No Advisory Posted | Shadow Cliffs | Shadow Cliffs Lake Water Quality ConditionsShadow Cliffs swimming is CLOSED for the 2022 season due to low water levels. There are no cyanobacteria advisories at this time. See the Cyanobacteria (Blue-Green Algae) Information page for additional details.Swim Beach Conditions [PDF] | Monitoring Program | |
No Advisory Posted | Big Break | Big Break Regional Shoreline Water Quality ConditionsCyanobacteria (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. |
Caution Advisory Posted | Lake Chabot | Lake Chabot Water Quality ConditionsCyanobacteria (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. |
No Advisory Posted | Crown Beach | Crown Beach Regional Shoreline Water Quality ConditionsCrown Beach is OPEN for swimmingSwim Beach Conditions [PDF] | Monitoring Program | |
Danger Advisory Posted | Quarry Lakes | Lago Los Osos at Quarry Lakes Park Water Quality ConditionsCyanobacteria (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. |
Danger Advisory Posted | Del Valle | Del Valle Reservoir Water Quality ConditionsCyanobacteria (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 | |
Area Closure Posted | Contra Loma | Area Closure Notice - Contra Loma Swim Lagoon / Alternate Swim Access
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Trail Closure Posted | Anthony Chabot | Trail Closure Notice
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Area Closure Posted | Crown Beach | Area Closure Notice - Crown Beach
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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).