Sumner Tunnel Closure Schedule 2024 March. The sumner tunnel/route 1a south will be closed on friday, march 1 at 11:00 p.m. The sumner tunnel/route 1a south will be closed on friday september 27 at 11:00 p.m.

The tunnel will be closed for work on friday, july 5 and is expected to be reopened no later than monday, august 5. Periodic weekend closures will resume in.