Drainage District #3 (DD3) is responsible for maintaining and operating a system of drainage facilities which provide conveyance for stormwater and limited agricultural drainage. Portions of the system are connected to the drainage system operated by the Ada County Highway District.
Ada County Drainage District No. 3 was established in the early 1920's through the statutory process including obtaining a court order. The District is comprised of 3 Commissioners, a part-time water supervisor, and engineer, and counsel for the District. The District’s function is to operate and maintain six drains serving the southeast Boise area and portions of the First Bench. These six drains now provide drainage for the remaining irrigated lands, including discharge from several irrigation canals and storm water (as well as sprinkler drainage) from the commercial and residential developments throughout southeast Boise. The six drains inter tie with several ACHD facilities and Boise City facilities. The District also maintains 2 pumps in the Apple Street/Bergeson Street area.