[DOC] [TLE] Missouri River - Wikipedia [PAR] The Missouri River is the longest river in North America. Rising in the Rocky 
Mountains of western Montana, the Missouri flows east ... For over 12,000 years, 
people have depended on the Missouri River and its tributaries as a source of... [DOC] [TLE] List of rivers of the Rocky Mountains - Wikipedia [PAR] This is a partial list of rivers of the Rocky Mountains in Canada and the United 
States. For a full listing of rivers in the Canadian portion of the range, see List of... [DOC] [TLE] Colorado River - Wikipedia [PAR] The Colorado River (Spanish: Ro Colorado) is one of the principal rivers of the 
Southwestern .... After a short run south, the river turns west below Grand Lake, 
the largest natural lake in the state. ..... The river and its tributaries drain most of 
western Colorado and New Mexico, southwestern Wyoming, eastern and 
southern... [DOC] [TLE] Rocky Mountains - Wikipedia [PAR] The Rocky Mountains, commonly known as the Rockies, are a major mountain 
range in ... Other mountain ranges continue beyond those two rivers, including 
the Selwyn ... This runs the length of British Columbia from its beginnings in the 
middle ... Also west of the Rocky Mountain Trench, farther north and facing the... [DOC] [TLE] Colorado River | river, United States-Mexico | Britannica.com [PAR] Major river of North America, rising in the Rocky Mountains of Colorado, U.S., 
and ... Its drainage basin covers 246,000 square miles (637,000 square 
kilometres) .... the largest prehistoric canal irrigation system in the American West 
was built... [DOC] [TLE] Missouri River | river, United States | Britannica.com [PAR] The MissouriRed Rock River system has a total length of some 2,540 miles ... 
The upper Missouri River at Gates of the Mountains, western Montana, north of 
Helena. ... There it makes its final eastward turn, flowing until it joins the 
Mississippi... [DOC] [TLE] US Geography 1 [PAR] RIVERS: 1. Mississippi River: The largest river (according to its volume of water) 
in our country. ... Colorado River: The longest river west of the Rocky Mountains. [DOC] [TLE] Major Rivers & Landforms of the United States | USA Today [PAR] In the eastern United States, the 1,500-mile-long Appalachian Mountains extend 
... west of the Mississippi River, until reaching the edge of the Rocky Mountains. 
... Together with its tributaries, it forms the largest river system on the continent... [DOC] [TLE] Western Physical Geography - DocuShare [PAR] The natural course of the river flows from Grand Lake, Colorado into the Gulf of ... 
of its flow, this river in the northwest is the largest river flowing into the Pacific... [DOC] [TLE] Longest Rivers In The United States - WorldAtlas.com [PAR] Sep 1, 2016 ... The river starts flowing from the Rocky Mountains in Western ... Its source is in the 
Lake Itasca in Minnesota, and its mouth is the Gulf of Mexico. [DOC] [TLE] Rivers in North America - North American Rivers, Major Rivers in ... [PAR] Nov 17, 2015 ... It's the longest river in Canada and dissects the Northwest Territories. ... It begins 
in southern Montana in the Rocky Mountains, first flowing... [DOC] [TLE] United States Geography: Rivers - Ducksters [PAR] The Missouri River is the longest river in the United States at 2,540 miles long. ... 
It begins in Western Montana and flows to the Mississippi River just north of St. 
Louis. ... The Rio Grande flows 1,900 miles from Colorado to the Gulf of Mexico. [DOC] [TLE] Rocky Mountain Waterfalls, Lakes and Rivers [PAR] Colorado is home to over 2,000 natural lakes, reservoirs, and enough rivers to ... 
at least a short hike meaning that it's entirely possible to enjoy a waterfall by 
yourself. ... Grand Lake, CO is located just one mile from the West Entrance of the 
Park. Home to Grand Lake, the largest and deepest natural alpine lake in the 
state. [DOC] [TLE] The Missouri is America's Longest River - VOA Learning English [PAR] Dec 18, 2012 ... The dirt makes the river a brown color for much of its length. The Missouri begins 
in the Rocky Mountains of North America. It

Question: It's the longest river west of the Rocky Mountains
Answer: Colorado