Rock Creek is a 52 miles (83.7 km) river in Missoula

Missoula County, Montana

-National protected areas:*Bitterroot National Forest *Flathead National Forest *Lolo National Forest *Rattlesnake National Recreation Area-Demographics:...

 and Granite County, Montana

Granite County, Montana

-National protected areas:*Deerlodge National Forest *Lolo National Forest -Demographics:As of the census of 2000, there were 2,830 people, 1,200 households, and 784 families residing in the county. The population density was 2 people per square mile . There were 2,074 housing units at an average...

. Rock Creek is a tributary of the Clark Fork river

Clark Fork (river)

The Clark Fork is a river in the U.S. states of Montana and Idaho, approximately long. The largest river by volume in Montana, it drains an extensive region of the Rocky Mountains in western Montana and northern Idaho in the watershed of the Columbia River, flowing northwest through a long...

. The river's headwaters are in Lolo National Forest

Lolo National Forest

Lolo National Forest is located in western Montana, United States with the western boundary being the state of Idaho. The forest spans 2 million acres and includes four wilderness areas; the Scapegoat and the Bob Marshall Wilderness are partially within the forest while the Welcome Creek and...

 near Phillipsburg, Montana. The river roughly parallels the Sapphire Mountains

Sapphire Mountains

The Sapphire Mountains are a range of mountains located in southwestern Montana in the northwestern United States. From a point near the Clark Fork River and the city of Missoula, they run in a southerly direction for a distance of approximately 60 miles , making up much of the border between...

 and enters the Clark Fork near Clinton, Montana

Clinton, Montana

Clinton is a census-designated place in Missoula County, Montana, United States. It is part of the 'Missoula, Montana Metropolitan Statistical Area'. The CDP was named for General Sir Henry Clinton...

. Sapphire

Sapphire

Sapphire is a gemstone variety of the mineral corundum, an aluminium oxide , when it is a color other than red or dark pink; in which case the gem would instead be called a ruby, considered to be a different gemstone. Trace amounts of other elements such as iron, titanium, or chromium can give...

s are found along the river.

Angling

Rock Creek is a popular fly fishing

Fly fishing

Fly fishing is an angling method in which an artificial 'fly' is used to catch fish. The fly is cast using a fly rod, reel, and specialized weighted line. Casting a nearly weightless fly or 'lure' requires casting techniques significantly different from other forms of casting...

 river for locals and destination anglers. It contains Rainbow

Rainbow trout

The rainbow trout is a species of salmonid native to tributaries of the Pacific Ocean in Asia and North America. The steelhead is a sea run rainbow trout usually returning to freshwater to spawn after 2 to 3 years at sea. In other words, rainbow trout and steelhead trout are the same species....

, Brown

Brown trout

The brown trout and the sea trout are fish of the same species....

, Cutthroat

Cutthroat trout

The cutthroat trout is a species of freshwater fish in the salmon family of order Salmoniformes. It is one of the many fish species colloquially known as trout...

 and the threatened

Threatened species

Threatened species are any speciesg animals, plants, fungi, etc.) which are vulnerable to endangerment in the near future.The World Conservation Union is the foremost authority on threatened species, and treats threatened species not as a single category, but as a group of three categories,...

 Bull trout

Bull trout

The bull trout, Salvelinus confluentus, is a char of the family Salmonidae native to northwestern North America. Historically, S. confluentus has been known as the "Dolly Varden" , but was re-classified as a separate species in 1980. Bull trout are listed as a threatened species under the U.S....

.