Per the RIOC website there is a BRIDGE ADVISORY.
“NYC DOT Bridge Operations Unit will be performing a test opening on the Roosevelt Island Bridge for preventive maintenance. They will be conducting the test opening on Wednesday, August 8th, between 11AM & 2PM. Please be advised that the test opening will take anywhere from 8 to 10 minutes to be completed. Thank you for your cooperation.”
I would expect with the rains and flooding that this would be postponed especially if the subway is still flooded out. Trying to find out now via 311.
UPDATE: 11:30 am
Apparently the tests are continuing but were delayed due to a [DOT policy?] that an EMS unit be on the Island side of the bridge before they commence the tests. Unbelievebale.