Upper Holter Lake offers a scenic 6.85 km paddling route near Helena, Montana, featuring calm reservoir waters surrounded by the dramatic limestone cliffs of the Gates of the Mountains region. Kayakers and canoeists can explore protected waters at 1,093 meters elevation, with access to 132 scenic viewpoints along the Lewis & Clark National Historic Trail corridor. This flatwater paddling experience showcases stunning canyon geology, wildlife viewing opportunities, and the historic landscape explored by the Corps of Discovery.