Hoffman/Broghammer concrete drop spillway structure in Delaware County, Iowa. Built in 1959, the reinforced drop spillway structure of "Island Type" serves as the tile outlet for 8" and 12" tiles and as a waterway stabilizer. The waterway was…
If you have natural resource concerns on
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Aerial view of Lake Manawa lake bed 6 months later than picture No. 20, showing dike construction where mud from east portion of the lake will be pumped from hydraulic dredge.
