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Boulder Creek is a creek draining the Rocky Mountains to the west of Boulder, Colorado, as well as the city itself and surrounding plains. The creek begins along the continental divide and flows through the town of Nederland into Barker Meadow Reservoir, a water supply for the city of Boulder. From there it flows down Boulder Canyon and through downtown Boulder. After leaving the city, it flows Northeast into Weld County, where it joins St. Vrain Creek and ultimately flows into the Mississippi River and the Gulf of Mexico.