Starting on September 9, 2013 the Boulder, Colorado began receiving record amounts of rainfall over the course of a week. Some areas in the Northern Colorado area received in excess of 15 inches of rain causing widespread and significant flash flooding followed by additional flooding downstream. Now that the clouds have left the area, satellite instruments that supported disaster response activities are beginning to obtain imagery, showing the impact on the area. On Tuesday, September 17, Landsat 8 flew over the area and obtained mostly cloud free imagery. By comparing this imagery to imagery from July 31, 2013 one is able to see the impacts of these historic rains, observed as large changes in creeks and rivers in the areas of Longmont and Boulder, Colorado.