A stretch of the River Walk is drained this week for routine maintenance. The city's Public Works Department says the drainage will continue through next Sunday, weather permitting. The main channel between East Nueva Street and East Josephine Street will be partially drained. The heart of the River Walk, including the river loop, will be completely drained. Go Rio Cruises will not operate downtown or in the Museum Reach area this week. Alamo Street will be closed to both vehicles and pedestrians between Commerce and Market Streets.