West Branch Green River Preserve Location Old Mill Rd.WilliamstownMA01267 Next Event Community Science: Hemlock Monitoring Group Meet-up - 07/21/2024 - 1:00 pm - 3:00 pm Loading Map.... West Branch Green River PreserveOld Mill Rd. - Williamstown 42.65282 -73.25185 Upcoming Events Community Science: Hemlock Monitoring Group Meet-up - 07/21/2024 - 1:00 pm - 3:00 pm