In July 2001 Sweet Arrow Lake (located on the Upper Little Swatara Creek) was drained to assess the condition of the dam and make repairs as required.  It is expected to be "dry" for the next 2 years.   During the draindown, many fish became stranded and were rescued by volunteers.  There were about 30 tiger muskies similar to the ones pictured here.

Bryozoans  (Brozoan) are considered nuisances by some: over 125 species are known to grow on the bottoms of ships, causing drag and reducing the efficiency and maneuverability of the fouled ships. Bryozoans may also foul pilings, piers, and docks. Certain freshwater species occasionally form great jellylike colonies so huge they clog public or industrial water intakes. Yet bryozoans produce a remarkable variety of chemical compounds, some of which may find uses in medicine. One compound produced by a common marine bryozoan, the drug bryostatin 1, is currently under serious testing as an anti-cancer drug.