Colter Falls is part of the Great Falls of the Missouri River where the Lewis and Clark Expedition was known to discover a freshwater fish of what order?
Colter Falls Colter Falls, also Coulter Falls, (4.3m) waterfall, nearly 0.5 mi in width, part of the Great Falls of the Missouri, on the Missouri River in north-central Montana. Downstream of Colter Falls lies Rainbow Falls, and upstream is Black Eagle Falls. The Lewis and Clark Expedition was known to discover Westslope cutthroat trout at the base of the falls. The falls is now flooded in the impoundment behind Rainbow Dam. As Rainbow Dam's reservoir is a run-of-the-river reservoir, it rarely is emptied, so the falls is rarely seen even in extreme drought. The falls was named by Paris Gibson, founder of the city of Great Falls, Montana, while they were not named by Lewis and Clark, who measured it at "6 feet 7 inches".
Fringed darter The fringed darter ("Etheostoma crossopterum") is a species of darter endemic to the eastern United States, where it occurs in the drainage of the Cumberland River, the Duck River system, the Shoal Creek system, and the tributaries of the Reelfoot Lakes of Kentucky, Tennessee, and Alabama. It is an inhabitant of small streams and rocky pool and nearby riffles where they prey on insect larvae and nymphs, as well as small crustaceans. This species can reach a length of 10 cm .