This document summarizes historic flooding that occurred in September 2013 along waterways in Colorado including Lyons, Longmont, and Boulder. It provides an overview of the affected areas and damage details such as washed out bridges and roads. Images show extensive flooding of cities, creeks overflowing, and reservoir water releases due to heavy rainfall. Key locations that experienced flooding include Lyons Junior-Senior High School, US Highway 36, the St. Vrain River, and Left Hand Creek.