The Maryland Biological Stream Survey (MBSS) is Maryland's first probability-based or random design stream sampling program intended to provide unbiased estimates of stream conditions with known precision at various spatial scales ranging from large 6-digit river basins and medium-sized 8-digit watersheds to the entire State. The Maryland Biological Stream Survey (MBSS) has sampled over 5,000 stream sites around the State to evaluate the health of our streams since 1995. Stream Wader volunteers have provided valuable supporting information on more than 7,000 other sites. Watersheds are color-coded as red (Poor) for a (Combined Biotic Index) CBI score of 3.0 or less, yellow (Fair) for 3.0-3.9, and green (Good) for 4.0-5.0. A green color indicates a relatively healthy, or good condition, watershed. A yellow color indicates a watershed that is in fair condition. A red color indicates an unhealthy, or poor condition, watershed. The CBI value was calculated by taking the collective average of the fish biotic indices (FIBI) and the benthic indices (BIBI) measured at various survey sites for each watershed between 2014 and 2017. For this dataset, the most recent CIBI values were calculated from samples taken as part of Round 4 of the MBSS (2014-2018) and will be updated accordingly in 2019. Watersheds without recent data have been recorded as having no data.Data source: Maryland Department of Natural ResourcesDate: 2014 - 2017

Dataset Attributes

  • Shape
  • ID
    {"value"=>"05020204", "count"=>1} (), {"value"=>"05020203", "count"=>1} (), {"value"=>"05020202", "count"=>1} (), {"value"=>"05020201", "count"=>1} (), {"value"=>"02141006", "count"=>1} (), {"value"=>"02141005", "count"=>1} (), {"value"=>"02141004", "count"=>1} (), {"value"=>"02141003", "count"=>1} (), {"value"=>"02141002", "count"=>1} (), {"value"=>"02141001", "count"=>1} ()
  • NAME
    {"value"=>"Casselman River", "count"=>1} (), {"value"=>"Deep Creek Lake", "count"=>1} (), {"value"=>"Little Youghiogheny R", "count"=>1} (), {"value"=>"Youghiogheny River", "count"=>1} (), {"value"=>"Savage River", "count"=>1} (), {"value"=>"Potomac River U N Branch", "count"=>1} (), {"value"=>"Georges Creek", "count"=>1} (), {"value"=>"Wills Creek", "count"=>1} (), {"value"=>"Evitts Creek", "count"=>1} (), {"value"=>"Potomac River L N Branch", "count"=>1} ()
  • CBI
    {"value"=>"No Data", "count"=>21, "code"=>-99999} (), {"value"=>4.20833333333, "count"=>2, "code"=>4.20833333333} (), {"value"=>3.12847222222, "count"=>1, "code"=>3.12847222222} (), {"value"=>2.625, "count"=>1, "code"=>2.625} (), {"value"=>3.60869565217, "count"=>1, "code"=>3.60869565217} (), {"value"=>4.25416666667, "count"=>1, "code"=>4.25416666667} (), {"value"=>3.6328125, "count"=>1, "code"=>3.6328125} (), {"value"=>3.58333333333, "count"=>1, "code"=>3.58333333333} (), {"value"=>3.60714285714, "count"=>1, "code"=>3.60714285714} (), {"value"=>2.81944444444, "count"=>1, "code"=>2.81944444444} ()

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