There were two sites under that program, iirc. That one guarded Grand Forks, and those missiles were relocated to Malmstrom. Minot still has an active wing.
Are you sure. This is the ABM treaty at a glance:
Negotiated between the United States and the Soviet Union as part of the Strategic Arms Limitation Talks, the now-defunct Anti-Ballistic Missile (ABM) Treaty was signed on May 26, 1972 and entered into force on October 3, 1972. The treaty, from which the United States withdrew on June 13, 2002, barred Washington and Moscow from deploying nationwide defenses against strategic ballistic missiles. In the treaty preamble, the two sides asserted that effective limits on anti-missile systems would be a "substantial factor in curbing the race in strategic offensive arms."
The treaty originally permitted both countries to deploy two fixed, ground-based defense sites of 100 missile interceptors each. One site could protect the national capital, while the second could be used to guard an intercontinental ballistic missile (ICBM) field. In a protocol signed July 3, 1974, the two sides halved the number of permitted defenses. The Soviet Union opted to keep its existing missile defense system around Moscow, while the United States eventually fielded its 100 permitted missile interceptors to protect an ICBM base near Grand Forks, North Dakota. Moscow's defense still exists, but its effectiveness is questionable. The United States shut down its permitted ABM defense only months after activating it in October 1975 because the financial costs of operating it were considered too high for the little protection it offered.
The United States and the Soviet Union negotiated the ABM Treaty as part of an effort to control their arms race in nuclear weapons. The two sides reasoned that limiting defensive systems would reduce the need to build more or new offensive weapons to overcome any defense that the other might deploy. Without effective national defenses, each superpower remained vulnerable, even at reduced or low offensive force holdings, to the other's nuclear weapons, deterring either side from launching an attack first because it faced a potential retaliatory strike that would assure its own destruction.
What the ABM Treaty Permited
-One regional defense of 100 ground-based missile interceptors to protect either the capital or an ICBM field
-A total of 15 missile interceptor launchers at designated missile defense test ranges
-Research, laboratory, and fixed land-based testing of any type of missile defense
-Use of national technical means, such as satellites, to verify compliance. (The ABM Treaty was the first treaty to prohibit a state-party from interfering with another state-party's national technical means of verification.)
-States-parties to raise questions about compliance, as well as any other treaty-related issue, at the Standing Consultative Commission, which was a body established by the treaty that meets at least twice per year
-Theater (nonstrategic) missile defenses of any type to protect against short- and medium-range ballistic missiles. (The ABM Treaty originally did not specifically delineate the point at which a missile defense would be considered strategic or nonstrategic. The United States and Russia negotiated and signed a demarcation agreement on this subject in September 1997. Russia ratified the agreement in May 2000, but it has never been transmitted to the Senate for its advice and consent, and therefore the agreement has not entered into force. The Bush administration's June 13 withdrawal from the ABM Treaty makes the demarcation agreement moot)
-Either state-party to propose amendments
https://www.armscontrol.org/factsheets/abmtreaty
