Iowa Admin. Code r. 571-45.5
A motorboat equipped with any power unit mounted or carried aboard the vessel may be operated on the following listed artificial marshes under the jurisdiction of the department of natural resources at a speed not greater than 5 miles per hour between January 1 and August 31 and with no speed restrictions between September 1 and December 31.
Bays Branch, Guthrie County
Big Marsh, Butler County
Brown's Slough, Lucas County
Cardinal Marsh, Winneshiek County
Dudgeon Lake, Benton County
Elk Creek Marsh, Worth County
Green Island, Jackson County
Hendrickson Marsh, Story County
Hooper Pond, Warren County
North Colyn, Lucas County
Otter Creek Marsh, Tama County
Princeton Area, Scott County
Riverton, Fremont County
Round Pond, Johnson County
South Colyn, Lucas County
Sweet Marsh, Bremer County
Walnut Creek Marsh, Ringgold County
Willow Slough, Mills County
Woodpecker Marsh, Wayne County
Iowa Admin. Code r. 571-45.5