GT Bay Watershed

Grand Traverse Bay Watershed

The Grand Traverse Bay watershed is definedwatershed map as the area of land that captures rainfall and other precipitation and funnels it to Grand Traverse Bay. The watershed covers major portions of Grand Traverse, Leelanau, Antrim and Kalkaska counties.

Watershed Statistics:

  • Watershed Area: 976 square miles
  • Volume of Bay: 8.97 cubic miles
  • Surface Area of Bay: 277 square miles
  • Miles of Shoreline: 132 miles
  • Deepest Point in Bay: 590 feet
  • Max Length = 32 miles; Max Width = 10 miles
  • Average Depth: 180 feet
  • Amount of Water Entering the Bay Per Year: 220 billion gallons
  • Sources of Water to Bay: Tributaries – 60%, Precipitation falling
    directly on the Bay – 35%, Groundwater – 5%

The Grand Traverse Bay watershed is made up of nine subwatersheds:

  • Elk River Chain of Lakes (503 square miles)
  • Boardman River (284 square miles)
  • Mitchell Creek (16 square miles)
  • Acme Creek (13 square miles)
  • Ptobego Creek (14 square miles)
  • Yuba Creek (8 square miles)
  • East Bay shoreline and tributaries (39 square miles)
  • West Bay shoreline and tributaries (68 square miles)
  • Old Mission Peninsula (31 square miles)

 

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