ChamberMaster Template Gateway Community Services Mental Health / Counseling Services Gateway Community Services Visit Website 26 4th St N Great Falls, MT 59401 (406) 727-2512 (406) 727-7451 (fax) Hours: Monday - Friday (8am-5pm)After Hours - On Call Emergencies (406) 727-2512 About About Outpatient Addiction Counseling. Non-Profit