Popham Beach is a sandy beach in Maine that extends southwest about three miles from Fort Popham, at the mouth of the Kennebec River, toward the mouth of the Morse River. It is near the site of the short-lived Popham Colony, founded in 1607 and abandoned the following year. The beach and the surrounding area are considered part of the town of Phippsb…Popham Beach is a sandy beach in Maine that extends southwest about three miles from Fort Popham, at the mouth of the Kennebec River, toward the mouth of the Morse River. It is near the site of the short-lived Popham Colony, founded in 1607 and abandoned the following year. The beach and the surrounding area are considered part of the town of Phippsburg in Sagadahoc County.