Mountain Valley Health Center 38 VT Route 11 Londonderry, VT 05148 Fax: 802-885-1845. Matthew Whitcomb Director, Mountain Valley Health Center mwhitcomb@springfieldmed.org. Clinic Hours: Monday – Friday 8:00 am – 5:00 pm Thursday extended hours until 6:00 pm. Walk-in Hours – No Appointment Necessary: Monday – Friday 8:00 am – 5:00 pm.