Exploration Day: Agua Chinon and the Sinks
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Please note: Preregistration is required due to limited parking capacity.
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 50 participants. Be sure to cancel your registration if you cannot attend, so that other participants can register. No walk-up registrations will be allowed.
Learn more at register at: https://letsgooutside.org/activities/2026/06/20/exploration-day-agua-chinon-and-the-sinks-3/
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 50 participants. Be sure to cancel your registration if you cannot attend, so that other participants can register. No walk-up registrations will be allowed.
Learn more at register at: https://letsgooutside.org/activities/2026/06/20/exploration-day-agua-chinon-and-the-sinks-3/
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Where is it happening?
Irvine Open Space Preserve, 13951 Esplanade Ave, Santa Ana, CA 92705-2673, United States
Event Location & Nearby Stays:
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Host or PublisherIrvine Ranch Natural Landmarks
