<P> On July 30, 2016, a storm dropped 6 inches (150 mm) of rain in two hours on the community . The resulting flash flood caused severe damage in historic Ellicott City, especially along Main Street . Many homes, roads, businesses, sidewalks, and more were destroyed by the flooding, including the town's landmark clock . A state of emergency was declared, and two people died as a result of the flooding . </P> <P> On the afternoon of May 27, 2018, historic Main Street flooded again, after the region received over eight inches of rain in the span of two hours, just days before the new flood emergency alert system was to become operational . Homes, businesses, and infrastructure, including roads and the town's clock, were again damaged and destroyed . There was one fatality, a National Guard member swept away while trying to save people . </P> <P> Ellicott City is in northeastern Howard County, bordered to the east and north by the Patapsco River, which forms the Baltimore County line . The Ellicott City census - designated place (CDP) extends to the northwest beyond Marriottsville Road and to the southwest beyond Centennial Road . It is bordered to the south by Columbia at Maryland Route 108 and to the southeast by Ilchester at Maryland Route 104 and Bonnie Branch Road . According to the United States Census Bureau, the CDP has a total area of 30.1 square miles (77.9 km), of which 30.0 square miles (77.6 km) are land and 0.1 square miles (0.3 km), or 0.41%, are water . </P> <P> Ellicott City is claimed to be built on seven hills . These hills lie southeast of the Historic District, which is in the Tiber River valley immediately west of the Patapsco River . The Tiber River is a small tributary of the Patapsco that forms the narrow valley followed by Main Street . Several deep stream valleys converge at this location, which increases the risk of flooding, but at the same time creates the town's heights . </P>

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