Opened 1930, closed 1961, it was owned by Butterfield Theaters. [Cinema Treasures]
Source: Kurt Teshka
The Riviera was on Second St about where the SOS office is today. Was next door to the old Wonderland Dept Store. I stopped by there as they were tearing it down. Found some old theater ticket and posters. Have long ago lost them in moving around. I was never there while it was still in operation.