A muddy trail winding through green hills is blocked by a small mudslide cutting across it

Alerts and Closures

Know Before You Go

Before visiting the preserves, please check this page for notices, closures and safety advisories.

To report an incident or issue such as obstructions on the trail at an Open Space Authority preserve, please Contact Us and select “Trail/preserve questions.”  

To report a fire, medical emergency or suspicious activity at an Open Space Authority preserve, please call 911 immediately. 

Alert Level Preserves Description
Trail alert
Sierra Vista Aquila Trail one-way

Visitors must travel counterclockwise around Aquila Trail 

Trail alert
Rancho Cañada del Oro Mountain Lion Sighting

2/4/2025: Mountain lion sighting at Longwall Canyon and Mayfair Trail. Click here to learn more about wildlife safety.