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The city of Boulder has the highest risk of flash flooding in Colorado because of its location at the mouth of Boulder Canyon, the number of people who live and work within the Boulder Creek floodplain, and the numerous other drainage basins running through the city, which run at a much higher rate during the summer monsoon season between April and September.
In addition, a lack of vegetation and permeable soil in the Fourmile Canyon burn area creates an increased possibility of rain run-off and flooding from both Boulder Creek and Fourmile Canyon Creek allowing debris and floodwaters to potentially move quickly downhill and into the city.
Even if it is sunny over the city, a flash flood can still happen at a moment’s notice. It is important to understand what a flash flood is, how to prepare ahead of time, and how to act quickly to protect yourself. Click here for more informaiton.