This stretch of creek is a Class V kayak course, meaning dangerous or deadly rapids exist. Wading above waterfalls, constrictions, or kayak portages is exceptionally dangerous. A few wide sections offer crossings when flows are below 150 cfs.
Hiking the tailwater below Gross Reservoir gets one ...
From Boulder drive West on Baseline Road, which becomes Flagstaff Mountain Road. Turn Left onto a dirt road at the Gross Reservoir North Shore parking area (Gross Dam Road). Public parking is in a small lot on the North side of South Boulder Creek. For a longer hike in, parking is available at the Walker Ranch Trailhead, off of Flagstaff Mountain Road.
Eldorado Canyon State Park:
From Boulder drive South on Hwy 93 toward Eldorado Springs and turn West onto Rd 170 (Eldorado Springs Drive). State Park entry fee or park pass is required.