"Assmosis is a balanced trad and sport route situated high on Big Ass Slab in the Estes Park Valley. This 100-foot climb mixes solid natural protection with bolts, offering a precise, measured ascent for climbers who appreciate straightforward movement and reliable gear."
Assmosis presents a compelling introduction to mixed trad and sport climbing on the broad expanse of Big Ass Slab, just above the more frequented bolted lines. Situated within the Jurassic Park sector near Lily Lake, this 100-foot route offers a clean, straightforward ascent with a practical layout that suits climbers seeking approachable but engaging terrain. The climb begins with solid natural protection placed within a prominent flake, rewarding careful rack management before transitioning to a series of fixed bolts that ease the way to a reliable two-bolt anchor at the summit. This shift from gear placements to fixed protection strikes a satisfying balance, inviting climbers to test their trad skills without the stress of a fully gear-dependent route.
The rock feels steady underfoot and hand, typical of the granite that dominates the Estes Park Valley, with subtle texture variations that encourage balanced movement rather than forced power. As you move upward, the surrounding spruce and pine forests frame the crag’s edge, with occasional breezes carrying the scent of resin and earth. The soundscape shifts from birdsong to the faint rustle of leaves stirred by afternoon winds, lending a quiet companionship to your climb.
Plan for a 60-meter rope if you want to rappel—though the climb's length doesn’t push the limits, the extra rope ensures a comfortable, safe descent without boundary concerns. For those not bringing full trad rack, this route still offers enjoyment if you opt for minimal gear: a light trad set up to 2 inches combined with quickdraws will cover all the protection needs here. The approach to Jurassic Park is short and manageable, a gentle walk from established parking near CO Hwy 7 that crosses open forests and patches of wildflowers common to late spring and summer.
Whether you are a trad climber refining your anchor placements or looking to dabble in sport protection, Assmosis stands as a solid choice in the Estes Park lineup. The route's approachable rating of 5.9 offers accessible challenges, blending calm slab climbing with manageable technical moves across moderate vertical terrain. It's ideal for morning or afternoon sessions, where sun exposure shifts slowly revealing the wall’s texture and relief with changing light. And once you reach the top, enjoy expansive views stretching across the valley and beyond, a reminder that every climb here ties you to the rugged heart of Colorado’s mountain landscape.
Though the route is well protected, initial gear placement in the flake requires careful inspection. Loose rock is rare but possible near the base. Be mindful of rope drag on the bolts above and confirm rappelling anchors are securely clipped before descent.
Use a 60-meter rope for rappel to avoid tight rope ends.
Place solid gear in the initial flake before clipping bolts mid-route.
Start early to avoid afternoon sun and benefit from cooler morning temperatures.
Expect steady slab friction but watch for occasional loose flakes near the start.
Bring a light trad rack up to 2 inches to protect the lower flake section. About five bolts lead the upper portion, ending at a two-bolt anchor. A 60m rope is recommended for rappel to ensure comfortable descent length.
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