Bridge Over Troubled Waters offers a home for young mothers and a transitional housing program for youth 18 to 24 years old. Other services include emergency shelter, substance abuse counseling, and GED preparation classes. Bridge operates a medical van with staff to provide counseling, certain medical services, and referrals. On weeknights the van arrives at the Park Street T stop between 6:00 and 7:00 p.m. It then proceeds to Harvard Square.