What river begins in Lewis and Clark County outside of Missoula, Montana?
Blackfoot River (Montana) The Blackfoot River, sometimes called the Big Blackfoot River to distinguish it from the Little Blackfoot River, is a snow-fed and spring-fed river in western Montana. The Blackfoot River begins in Lewis and Clark County at the Continental Divide, 10 miles (16 km) northeast of the town of Lincoln (4536 feet, 1382 m). The river's headwaters are between Rogers Pass (5610 ft, 1710 m) to the north and Stemple Pass (6376 ft, 1943 m) to the south. It flows westward through the town of Milltown and enters the Clark Fork River approximately five miles (8 km) east of the city of Missoula (3210 ft, 978 m).
Horseshoe Hills The Horseshoe Hills, el. 6673 ft , are a roughly crescent-shaped range of hills north of Manhattan, Montana in Gallatin County, Montana. They lie in the area between the southern Big Belt Mountains and the northern Bridger Range. The hills are bounded on the north by Sixteen Mile Creek (which begins in the Crazy Mountains), the first major tributary of the Missouri River. As they are in the rain shadow of the Boulder, Elkhorn, and Bull Mountains to the west, the Horseshoe Hills are notably dry, receiving 10 - 12 inches of precipitation annually. This is especially true on the southern and southeastern flanks, which are also in the rain shadow of the hills themselves. In the driest areas, Missouri foxtail cacti, plains prickly pear cacti, and yucca abound, as well as prairie rattlesnakes. Much of the hills are private property, but there is also some State, BLM, and National Forest land.