[1] Closed to interstate traffic since 1987, the tunnel served as the Center for National Response for military first responders to train for various situations that may arise in such a location without alarming the general public.

In February 2022, an agreement was made between the West Virginia Adjutant General's office and a local farmer to utilize the facility to grow mushrooms.

From 1976 to 1983, the increasingly heavily traveled Turnpike was widened from two lanes to four over its entire length with the exception of the Memorial Tunnel.

[3] This caused bottlenecks where the newly widened divided highway transitioned to the two-lane, two-way tunnel, which also had a lower speed limit.

[4] Between 1992 and 1995, the Department of Transportation entered a deal with the state to utilize the abandoned tunnel for smoke, fire and ventilation experiments.