Beavers are one of Maine’s most frequently recorded mammals, with 839 mapped sightings and reports reaching nearly every corner of the state. That volume reflects how easy a dam or a lodge is to spot, not a count of how many beavers are actually out there.
Dams that outlast the builder
Records cluster most heavily around Acadia National Park, where beaver dams have flooded stretches of the historic carriage-road system for generations, sometimes closely enough that the park has to manage water levels to keep the roads passable. Baxter State Park’s slower streams and bog country around Katahdin offer the same setup: standing water, a mix of hardwood and softwood for building material, and enough distance from people to den undisturbed. A beaver doesn’t need a pond already there; it makes one, damming a stream to keep its lodge entrance safely underwater and its winter food cache, a pile of cut branches, within easy reach under the ice.
Spring records track ice-out
Sightings jump sharply in April and May, right around when Maine’s ponds and streams shed their ice. Beavers spend winter mostly out of view, swimming beneath a frozen pond between the lodge and a stash of submerged branches rather than surfacing. Once the ice breaks up, they’re back out repairing winter damage to the dam and feeding on fresh green growth along the bank, which is exactly when most people get a clear look.
Status in Maine
NatureServe ranks the beaver S5, secure, and it’s native to Maine. Its dam-building keeps ponds, wetlands, and slow-water features in place across the state’s parks and forests long after the animals that built them have moved on.
Full species profile
