Due to its close proximity to Canada, during Prohibition liquor was easy to come by and kept the Brush Lake Summer Resort in business. There was also a dance hall! After the Prohibition era, church and scout groups used the lake, but in the years before it became a state park, Brush Lake wasn’t the popular destination it once had been. Today the area where the dance hall once stood on the south side of the lake, is now privately held.

In Eastern Montana, it is not uncommon to see the Aurora Borealis during solar events, especially during the fall and winter. Brush Lake's northern latitude and remote location make it a "stellar" destination for your next stargazing or northern lights viewing adventure. As a dark sky location, Brush Lake is guaranteed to bring some of the best night sky views in the area.

Because of the high alkali content, Brush Lake does not support a significant fish population. But in contrast, it showcases a distinctive aquamarine blue color. The lake attracts many varieties of birds including various species of ducks, gulls, and many others. Brush Lake has become a great location for bird watchers worldwide.