L-85 was one of four Nike Ajax sites placed around Loring AFB, along with L-13 (Caswell), L-31 (Limestone), and L-58 (Caribou), manned by Regular Army units from the 3rd Missile Battalion, 61st Artillery, providing defense for Loring AFB and the northeastern approaches to the United States.
The four Nike sites were constructed during 1956, with L-85 located near Connor Township. Unlike its sister sites L-13 and L-58, L-85 was never converted to Nike Hercules and was deactivated earlier than those two sites, which remained operational until 1966.
Notably, the IFC area of L-85 (designated L-85C) was later repurposed as the Louis Blotner RBSS (Remote Bomb Storage Site), a post-closure Air Force use that was a fairly unique fate among Maine Nike sites.
The "85" designation places L-85 at roughly 306 degrees from north (west-northwest) of the Loring AFB center point, positioning it on the western flank of the defensive ring around the base.