Patapsco River within the Park. It was a nearly complete barrier to anadromous fish passage. Although a fish ladder was installed in 1992, it blocked five of six native fish species trying to run upstream to spawn. Impetus to remove Bloede's Dam began in the 1980s when nine drowning deaths occurred, and also to restore fish passage to a large portion of the Patapsco River watershed. Dam demolition began on September 12, 2018, opening the fishery and creating a rocky rapid for kayaking. Two dams upstream of Bloede's Dam, Simkins and Union, were removed in 2010. The removal of Bloede's Dam leaves Daniels Dam, upstream, as the last remaining dam along the mainstem Patapsco River. Tributaries Deep Run (Carroll County) Board Run (Baltimore County) Roaring Run (Carroll County) Liberty Reservoir (Carroll/Baltimore Counties) Piney Run (Carroll County) Keysers Run (Baltimore County) Beaver Run (Carroll County) Norris Run (Baltimore County) Timber Run (Baltimore County) Middle Run (Carroll County) Morgan Run (Carroll County) Locust Run (Baltimore County) Snowdens Run (Carroll County) Falls Run (Baltimore County) South Branch Patapsco River Davis Branch (Howard County) Brice Run (Baltimore County) Bens Run (Baltimore County) Cedar Branch (Baltimore County) Miller Run (Baltimore County) Sucker Branch (Howard County) Tiber River (Howard County) Cooper Branch (Baltimore County) Bonnie Branch (Howard County) Sawmill Branch (Baltimore County) Cascade Falls (Howard County) Soapstone Branch (Baltimore County) Rockburn Branch (Howard County) Deep Run (Howard/Anne Arundel County) Stony Run (Anne Arundel County) Herbert Run (Baltimore County) Holly Creek (Anne Arundel County) Middle Branch to Gwynns Falls (Baltimore City) Northwest Harbor to Jones Falls (Baltimore City) Colgate Creek (Baltimore City) Curtis Creek (Baltimore City) Bear Creek (Baltimore County) Cox Creek (Anne Arundel County) Stoney Creek (Anne Arundel County) Rock Creek (Anne Arundel County) Old Road Bay (Baltimore County) Bodkin Creek (Anne Arundel County) Ecology and conservation Removal of Bloede's Dam in September, 2018 opened up of the Patapsco River watershed, which will potentially restore spawning runs of at least six species of native anadromous fish: alewife (Alosa pseudoharengus), blueback herring (Alosa aestivalis), American shad (Alosa sapidissima), hickory shad (Alosa mediocris), striped bass (Morone saxatilis), sea lamprey (Petromyzon marinus), as only one species, sea lamprey, were found using the Bloede's Dam fish ladder in 2012. One catadromous species would likely also benefit, the American eel (Anguilla rostrata), a fish species that lives in freshwater and migrates to the ocean to breed. The Bloede's Dam removal project