The trail was historically an unofficial, dangerous route that was formally adopted and improved by the U.S. Forest Service in 2015 to manage erosion and safety.
The descent involves navigating a rugged section known as 'The Slide,' which requires physical maneuvering over rock faces.
Emergency rescues are frequent at this location due to hikers suffering from heat exhaustion or dehydration during the return uphill climb.
The waterfalls are situated along Boulder Creek, which drains a portion of the Cuyamaca Mountains.
Three Sisters Falls Trailhead serves as the primary entry point for a strenuous 4.5-mile round-trip hike leading to a series of three tiered waterfalls cascading into swimming holes. Located within the Cleveland National Forest, the trail features a steep elevation change of approximately 1,000 feet from the trailhead to the base of the falls. The terrain is rocky and exposed, involving significant scrambling over boulders and loose scree. During the spring runoff, the water flow is at its peak, while the pools become stagnant or dry during late summer months. A federal Adventure Pass or National Forest parking permit is required for vehicles parked at the trailhead. The area is prone to extreme heat, and the canyon floor lacks significant shade along the path.
The base of the middle waterfall, providing a view of the tiered drop and the surrounding granite canyon walls.
Carry at least three liters of water per person, as there is no reliable potable water available on the trail.
Begin the hike at sunrise to avoid the midday heat, which can exceed 100°F (38°C) in the canyon.
Wear high-traction hiking boots with ankle support to navigate the steep, loose sections.
Do not attempt this hike during peak summer heat, as the steep uphill return is physically exhausting and potentially dangerous.
The trail is frequently closed during periods of extreme fire danger; check U.S. Forest Service alerts before departure.
Pack out all trash, stay on the marked path to prevent erosion, and yield to uphill hikers.
