On the night of October 18, 2015, heavy rains pounded Grapevine Canyon, and floodwaters roared out of the canyon mouth and down the valley behind the ranger station. After nearby Mesquite Springs Campground was evacuated, rangers and 20 others were trapped overnight in this area as power poles and dumpsters floated by. By morning, heavy equipment was needed to clear the road and evacuate the group. Although this area averages only four inches of rain per year, more than three inches of rain and hail fell in a five-hour period, and floodwaters ran at 3,000 cubic feet per second, cutting deep channels, destroying roads, and depositing mud up to four feet deep in and around buildings at Scotty's Castle, three miles away in Grapevine Canyon. The 2015 flood was exceptional, unlike anything else in the hundred-year history of the site. Scotty's Castle itself sustained little damage, but floodwaters pushed open doors in some buildings, broke windows, damaged walls, left behind a foot of mud and a four-foot-high water line, ripped out all water, power, telephone, and sewage utilities, and destroyed huge sections of roads. By the end of 2015, most mud and debris had been cleared, the power line had been replaced, and utilities were being repaired, but the park sustained $50 million in damages and repairs could take several years. Other than roof leaks, the castle escaped damage from the downpour, though the picnic area, visitor center, and offices were heavily damaged. Chicago millionaire Albert Johnson built the Spanish-style villa as a personal retreat, and its nickname, Scotty's Castle, grew from the myth that a secret goldmine discovered by Walter E. Scott, known as Death Valley Scotty, funded its construction; both men enjoyed the story and allowed it to flourish.