Part of the main channel of the San Antonio River Walk will be drained Monday through Thursday of next week for maintenance work. The channel will be emptied between Josephine Street and South Alamo Street, an area that was last drained in 2016. Work crews will be able to inspect walls that are usually under water. The Go Rio River cruises will still be operating, but on a different path. The Go Rio Shuttle to the Museum Reach area of the River Walk will be shut down during the operation.