While these dates are always subject to change, CSX announced on Friday
that it expects to reopen 4th Street just south of the freeway by Wednesday, Nov. 23, as it completes the demolition of the Phase 1 temporary bridge deck over the new tunnel that is being built, and construction of the new Phase 2 deck over the existing tunnel that will now be rebuilt and expanded.
Once the 4th Street intersection opens, the next big closure will be prepped, with the expectation that 3rd Street SE will close at Virginia Avenue for up to eight weeks, beginning perhaps on Monday, Nov. 28, to do the same demolition of the Phase 1 deck and construction of the Phase 2 deck.
Note that, unlike when the Phase 1 deck was built over 3rd Street earlier this year in a way that allowed northbound traffic to continue to flow, this is a full closure. (Though pedestrian access will remain in place, as will access to the Capitol Quarter driveway entrance on 3rd.)
This does not affect access to I-695 from the 3rd Street ramp.
If you want to see recent photos of the new tunnel and all the related construction, the Coffee with Chuck slides from Nov. 16
have a pile of them. (The slides also note that this is month #18 of the expected 42 months of total construction.)