The 30 foot tall waterfall, Lewis Falls on the Lewis River is easy to spot when driving south towards the Yellowstone South Entrance. The falls were named after Meriwether Lewis from the famous Lewis and Clark Expedition in 1803-07. The falls are inside the South Entrance before getting to Old Faithful and the Upper Geyser Basin. There is a pull-off and a short trail to get a better view of the falls. You can also see the falls from the Lewis River bridge which is about 9.6 miles north of the Yellowstone South Entrance and a little over 11 miles south of the West Thumb Junction. Upon entering the park from Grand Teton by way of the south gate, Lewis Fall will be the first thing that grabs your attention. Many onlookers stop on the road to enjoy the beautiful falls with water streaming through the rocks.