Castle Bluffs Rapids is a stretch of rapids in Fergus County, Montana, in the Northwestern Great Plains region. It lies about 51.2 miles north of Lewistown and roughly 97.9 miles east of Great Falls as the crow flies.
The Northwestern Great Plains are semi-arid rolling grassland with badlands and isolated buttes. Waterfalls are small and found on the few streams that cut through resistant rock.
There are 10 recorded rapids in Fergus County. Castle Bluff Rapids, is under a mile away. Magpie Rapids, is about 1.3 miles away. Lone Pine Rapids, is about 1.3 miles away.
Castle Bluffs Rapids is located at 47.7930° N, 109.2440° W. The listing is based on the USGS Geographic Names Information System, one of the sources compiled by the U.S. Geological Survey in its inventory of waterfalls and rapids of the conterminous United States. 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 rapid yet.