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Evermann was the first to conduct limnological studies of Montana's streams and lakes. He provides an excellent summary of physical and natural history features of streams and lakes in western Montana. His surveys covered the Clark Fork and Snake Rivers west of the Divide and the Jefferson, Madison, Gallatin, upper Missouri, and upper Yellowstone Rivers east of the Divide. His 1891 paper has photos and maps of the areas covered by the survey.

Evermann, B.W.  1891.  A reconnaissance of the streams and lakes of 
     western Montana and northwestern Wyoming.  Bull. U.S. Fish Comm.

Evermann, B.W.  1892.  Description of a new sucker Pantosteus 
     jordani from the upper Missouri Basin.  Bull. U.S. Fish Comm.
     12:51-56.

Evermann, B.W. and U.O. Cox.  1896.  A report upon the fishes of the 
     Missouri River basin.  U.S. Comm. of Fish and Fisheries,(1894) Part 
     XX, p. 325-429.

Gilbert, C.H. and B.W. Evermann.  1895.  A report upon investigations in 
     the Columbia River Basin with descriptions of four new species of 
     fishes.  Bull. U.S. Fish Comm. (1894), 14:169-208.