Sentinel Falls is a waterfall on West Fork Rock Creek in Carbon County, Montana, in the Middle Rockies region. It lies about 13.9 miles west of Red Lodge and roughly 66 miles southwest of Billings as the crow flies.
Its height has not been recorded in the source data. By form it is a tiered waterfall, falling in several distinct steps one after another. It falls in 2 drops.
The Middle Rockies are high, glaciated mountain ranges with alpine peaks, subalpine fir and spruce forest, lodgepole pine and grassy intermontane valleys. Snowmelt streams cascade down glacial valleys and canyon walls. West Fork Rock Creek carries 2 recorded waterfalls along its course.
Carbon County holds 7 recorded waterfalls, and several are close by. Calamity Falls, a cascade waterfall, is under a mile away. Five Mile Falls, an 880-foot tiered waterfall, is about 6.7 miles away. Martin Lake Falls, a 1,054-foot tiered waterfall, is about 9.2 miles away.
Sentinel Falls is located at 45.1564° N, 109.5286° W. The listing is based on the World Waterfall Database, one of the sources compiled by the U.S. Geological Survey in its inventory of waterfalls and rapids of the conterminous United States. The creek name is confirmed against the federal Geographic Names Information System. The exact position has not yet been verified on aerial imagery, so treat the map pin as approximate. Details on trails, parking and access have not been documented for this waterfall yet.