Gosh didn't know there were still alleys nowadays - haven't heard that term since I lived in Chicago more than 50 years ago.
There are several here. Mostly for utility access. Ours is larger than most as the water diversion culvert used to run behind our house. In 1976 after the dam broke in Estes Park and flooded down the canyon it was redirected elsewhere. There is occasionally (like once every 30 years) water in it from storm drain overflow. It is a good 7' deep in the middle.
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