I inspected the pipe more thoroughly on Sunday. The elbow actually sits about 5 feet under the surface, looks less deep from the bank due to clear water I guess. Both the vertical pipe and the elbow now seem secure, they're not loose applying normal force. I didn't want to really put my weight behind it twisting for fear of breaking something. I did look down the vertical pipe and saw water in the pipe at the elbow level. It was static, not flowing. Is that normal? Any other thoughts??