Beaver Brook Farm - Dracut, MA. Visitors are welcomed by blooming bioretention pollinator gardens that slow, filter, and convey storm water runoff from the parking area. Educational signs help visitors identify wildlife, plants, and interpret the ecological functions of the gardens for storm water management as they enjoy events at the new outdoor amphitheater or meander along walking trails through 10-acres of hay meadow and fruiting hedgerows for grassland birds, songbirds, and pollinators.