The Upper St. Anthony Falls Lock and Dam opens to the public for the 2021 summer season on Memorial Day Weekend. The lock wall will be open Tuesday-Sunday, 10 am-5:30 pm, from Memorial Day weekend through Labor Day weekend. Last entry will be at 5:15 pm. Free ranger-led tours of the lock and dam are offered daily at 11 am and 2 pm. Learn about the the lock and dam, St. Anthony Falls, and milling. Tours are limited to 10…