To the north of the mountain is South Boulder Creek, a large creek that starts near the Continental Divide, passes through Gross Reservoir and later joins Boulder Creek about six miles (10 km) downstream. Located along this creek is Eldorado Canyon State Park. Within the Park is the Rattlesnake Gulch Trail that climbs about halfway up the north flank of Eldorado Mountain. Near the top of this trail is the site of the former Crags Hotel, which was in business from 1908 until 1913 when it burned down. The Park has converted the hotel ruins into a historic site for visitors. When it was operating, the hotel also ran a funicular that went down from the hotel to the creek. Still on the north side are three thin cliffs bands lined in a single column—Continental Crag, Upper Peanuts Wall, and Lower Peanuts Wall—from top to bottom. At the very base of the flank is the famous tower-like Bastille. Further down the creek is the unincorporated community of Eldorado Springs.