Castner Falls is one of the recorded waterfalls on Geyser Creek in Cascade County, Montana, in the Northwestern Glaciated Plains region. It lies about 16.1 miles south of Sun Prairie and roughly 16.3 miles southwest of Great Falls as the crow flies.
No height measurement has been recorded for it yet. The water comes down as a plunge, where the water drops vertically and loses contact with the rock face.
The Northwestern Glaciated Plains are rolling grassland and cropland shaped by ice-age glaciers, with prairie potholes and few waterfalls.
There are 8 recorded waterfalls in Cascade County. Black Eagle Falls, a dam waterfall, is about 18.5 miles away. Buffalo Falls, 60 feet high, is about 19.7 miles away. Colter Falls, is about 20.8 miles away.
Castner Falls is located at 47.3048° N, 111.4966° 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 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.