Site Search

Agua Chignon and the Sinks Exploration ***Must register on

Loading Hikes
  • This hike has passed.

Agua Chignon and the Sinks Exploration ***Must register on

**Must also register here:

We will be hiking around 8.3 miles with about 1,100 ft. of elevation gain. This is an out and back.

Start your weekend off by exploring the Agua Chinon wash and the Sinks through this self-guided opportunity. Designated trails will be open for self-guided trail use in OC Parks’ Irvine Ranch Open Space. Trail routes vary in distance and level of difficulty with choices ranging from easy one-hour walks to a strenuous 9.5-mile trek. Whether traveling by feet or on two wheels, this exploration day is a treasure waiting to be discovered by hikers and mountain bikers alike. Visitors to the Open Space during this activity are able to hike or bike to the West and East Sinks viewing areas.

Please review our Trail Tips page and FAQ page to prepare for this challenging hiking and biking opportunity.

All participants are required to check-in and complete their registration at the Portola Staging Area prior to accessing the trail system. Gates will open no earlier than 8 a.m. The West Sinks route is 6 miles round trip with a challenging hill climb while a visit to the east viewing deck is a strenuous 8 miles round trip and may take the majority of the designated activity time. Registration for this event is limited to 70 participants. Be sure to cancel your registration if you cannot attend, so that other participants can register. No walk-up registrations will be allowed.

This is a natural area characterized by certain inherent dangers including: mountain lions, rattlesnakes, poisonous plants and insects, weather extremes, loose rocks and rugged terrain. The Irvine Ranch Open Space contains rare and sensitive habitat and is under strict protection. Participants are required to stay on designated trails at all times. OC Parks Rangers may issue citations for visitors found off-trail. For your safety, please stay on the designated paths during your visit to Agua Chinon. To learn more about the staging areas and activity locations, please visit our Staging Areas Playlist page.

Other Important Notes:

OC Parks Rangers require all trails to be cleared for closure by 1:00pm.

No new trail users will be permitted onto the trails beginning one hour prior to closing.

Dogs are prohibited on the Irvine Ranch Open Space. By nature, dogs are predators; their presence and their lingering scent disturb the indigenous wildlife and disrupt vital routines long after a dog has left the area.

Minors, ages 18 and under, should be accompanied by a parent or guardian.

Adult mountain bikers are requested to wear helmets. Minors are required to wear helmets per state law.

Motorized recreation vehicles of any class or type are not permitted for use in the Irvine Ranch Open Space.

Inclement weather or fire danger will cause the program to be cancelled.

March 09 2024


Date: March 9
Time: 8:00 am - 11:45 am
Hiking Group:
RSVP: Visit Meetup Website


Portola Staging Area

Portola Staging Area
Trabuco Canyon,CAUS

+ Google Map


Trail Mix
Website: Visit Organizer Website


Leave a comment

Trail statistics are approximate. For safety purposes always assume they are underestimated. But don’t be disappointed if they are overestimated. Bring more water and snacks than you think you’ll need.

Trail descriptions are based on previous hikes. Current conditions are unknown until arrival. Expect the unexpected and plan accordingly.

The Organizers and members of Hiking With Dean are not professional leaders, guides, or mountaineers. The function of the member or organizer is only to organize the trip. Each person who shows up for a trip/meetup (and their guest or guests) is responsible for his or her own safety. By attending a hike, or any other event organized by this group, you are acknowledging that you and any guests that you bring are aware of the risks, dangers and hazards associated with the activity and freely accept and fully assume all such risks, dangers and hazards, and further agree to release and discharge the Organizers, Members of the Hiking With Dean Meetup Group from and against any and all liability arising from your participation in the group activities per our ASSUMPTION OF RISK AND LIABILITY WAIVER and Section 6.2 of the Terms of Service.