(Atlantic) The Iowa Department of Natural Resources is conducting a Rock Reef project at Lake Manawa. An excavator is on a barge building 1,140 tons of Class D rip rap.
Iowa Department of Natural Resources biologist John Lorenzen said our reefs are being built along dredged areas, with three of them having a top reef elevation of eight feet below the water’s surface, and one reef in a shallow area having a top reef elevation of four feet below the water’s surface. Lorenzen says this will be valuable habitat that will not conflict with boating.
Lorenzen says once the reef placement is done, the contractors will move to the inlet tube and put an extension on the tube coming into the lake.
Lorenzen says Manawa has a four-foot-diameter tube that runs from a low-head dam on Mosquito Creek, approximately 1.5 miles underground, to feed the lake. The tube runs under the interstate and under the shopping center with PetSmart, in that area.
