A nice little canon, it looks to have about a 3 inch bore (~75 MM). Its age is indeterminate, as is its history. It could have been designed as a ceremonial cannon or a signal cannon.
Arbor Crest Estate Winery is a
National Historic Site, situated high atop a hill on the northern outskirts of Spokane Valley, on North Fruit Hill Road. The estate was built in 1924 by
Royal Newton Riblet. It was purchased in 1984 by
Arbor Crest to serve as their headquarters.
The winery is open for touring and wine tasting from noon to 5:00 PM daily. Situated as it is atop a basalt bluff, it has an excellent view of the valley below.