Andover Trails Facilitates use of the trail systems in the town of Andover Massachusetts, including recreational use of the Shawsheen River. Website Type of organization: non-profit_organisation Current Events Upcoming Events Past Events There are currently no events. There are currently no events. 18 Apr 18 Apr - 05 Jun Shawsheen River volunteer river herring count 2022-04-18 @ 06:00 (GMT+0000) - 2022-06-05 @ 19:00 (GMT+0000) 15 Stevens Street, Andover, MA, USA Participatory science event