What is now Castle Rock Road, then Stage Road, was one of the original stagecoach line routes on the mountain. The dirt road on this side was eight miles long and 12 feet wide and ran along Pine Canyon before heading up into the mountain. The route is now the Stage Road hiking trail in Mount Diablo State Park and still leads to the hotel site.
Hall then purchased 23 acres in December 1873 and built the Mountain House hotel over the next four months. It opened on May 2, 1874, the same year the toll roads opened. For many years there were two stagecoaches every day connecting Walnut Creek and Danville with the hotel.
Although the trip could be done in a day, many tourists stayed overnight, eating a five-star dinner in the evening and then waking up early the next morning to hike to the summit for the sunrise.
Hall installed a large tent with a wooden floor at the summit for people who wanted to spend the night there. According to Rich McDrew, who along with co-author Rachel Haislet wrote the book, “Mountain Lore,” the reason to go was to hike to the summit for the incredible views.
“The hotel had a kind of uniqueness to it and a kind of adventure to it,” McDrew told Patch reporter David Mills in 2012. “Business was quite good for awhile. It was a pretty popular thing.”
In “Mountain Lore” a letter from Hall to his siblings is quoted as saying 2,000 people had come up the roads in the first four months Mountain House was open.
In 1878, Hall ran into financial problems and sold the hotel to Margaret Sloan, who operated the facility for another 14 years with her son, Horace. By 1890, the novelty of the hotel had started to wear off. The platform at the summit burned down in 1891. The hotel was abandoned in 1895 and fell into disrepair. In 1901, it burned to the ground in a fire many believe was set by neighboring ranchers who were tired of people hiking through their land to reach the abandoned structure.
Now you know…
Sources: “On Mount Diablo: The Old Hotel at the Top,” by David Mills, Patch, June 19, 2012, : https://patch.com/california/dublin/on-mount-diablo-the-old-hotel-near-the-top-6ac07d8d; “Mountain Days,” Oakland Tribune: https://www.newspapers.com/article/oakland-tribune-mountain-house-mt-diab/14925154/; “History of Mt Diablo,” Seth Adams, Mount Diablo Review, Fall 2000, https://www.mdia.org/history-of-mount-diablo
(Thank you to Shirley N for bringing this wonderful story to our attention!)
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