Largemouth Bass and Smallmouth Bass Slot Length Limit Fishing Areas. The following special regulations are in effect in these areas during the open season for largemouth and smallmouth bass: A person may possess five bass (largemouth and smallmouth bass in aggregate) per day while fishing in these areas; A person may not possess any largemouth bass or smallmouth bass from 11 inches up to but not including 15 inches total length while fishing in these areas; A person may possess one largemouth bass or smallmouth bass per day, 15 inches and over, while fishing in these areas. The areas subject to this provision are: St. Mary's Lake, Maryland Route 5, St. Mary's County; Little Seneca Lake, Montgomery County; Johnson Pond, Wicomico County; and Leonard Mill Pond, Wicomico County. Impoundments Limited to Catch-and-Return Fishing. This section applies to the following areas: Lake Hashawha in Carroll County; Upper John Owings Pond in Carroll County; and Waterworks Park in Anne Arundel County. While fishing in the areas set forth in §B(1) of this regulation, a person: Shall immediately return live any fish caught to the water where taken; and May not keep or possess any fish while fishing in these areas. Catch-and-Return Bass Areas. Special provisions in effect for catch-and-return bass areas are that a person: Who catches a largemouth or smallmouth bass shall immediately release that bass in the water where it was caught; and May not possess largemouth or smallmouth bass while within the designated catch-and-return areas. The areas subject to the provisions of this section are the: Potomac River from Dam No. 2 (Seneca Breaks) upstream to the mouth of the Monocacy River; Monocacy River from the Potomac River upstream to Buckeystown Dam; and Patapsco River from Interstate 70 downstream to Maryland Route 144 (Frederick Road).