We were at DCA at park opening on Tuesday. TSMM was temporarily closed (along with KTC, SSS, JJ, LM, LRR, and MI - seriously, with the planned closures - less than half the park was open). I watched the app, and we headed over when it opened about a half hour in. We stopped at the restroom over there before getting in line and noticed that they closed the line off again after we were in line. The ride wasn't broken down. When we got off, I noticed the carousel was not running and when we left the area, they had CMs blocking off access to the pier again. We speculated that they were closing off the pier not due to TSMM being down, but due to something that was going on with construction that may have been hazardous to guests in the area.