Multnomah County Drainage District's mission is to enhance community safety and support the region’s vitality. MCDD reduces flood risk by maintaining our levee system, managing drainage, and responding to emergencies. We help protect lives and property from flooding by operating and maintaining flood management systems for nearly 13,000 acres of land along the Columbia Slough and the lower Columbia River. We manage and maintain flood control systems such as levees, pump stations, and flow control structures that reduce flood risk for residential communities and vital public infrastructure such as the Portland International Airport, sections of I-5, I-205, and I-84, and Oregon’s second largest supply of drinking water. TELL ME MORE ABOUT LEVEES.