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101 120 04 060 Ohio's Hydrologic Units 010 040 04100002 050 04100001 020 010 030 010 040 050 050 04100003 020 020 060 040 030 070 030 020 030 010 030 080 010 04110003 04110004 04100006 030 0 030 090 5 050 070 010 0 050 040 3 060 020 010 0 1 050 060 0 060 010 04100009 060 010 2 04100006010 140 010 020 060 04110001070 04100005 050 010 130 120 040 05004110002 020 040 050 020 110 04100012 060 040 050 040 030 060 050 020 020 040 120 05030103 110 030 04100900011 020 100 030 060 030 070 080 100 030 010 030 04100007 080 050 010 020 080 040 04100008 020 050 070 060 020 120 090 060 010 050 050 030 050 030 050 010 070 040 020 090 060 040 070 010 100 030 02005040002 05060040003 060 040 090 090 080 030 04100004020 040 040 080 05030101 020 050 030 070 05040001 100 040 010 010 040 030 070 040 020 120 190 100 080 030 010 110 020 110 180 050 020 010 020 070 05120101 040 130 030 010 210 050 060 050 150 080 3 010 0 030 160 1 010 090 190 340 0 040 180 170 2 010 1 060 070 020 5 100 070 0 150 090 150 130 010 190 05060001 030 05080001 05020040006 05040030106 110 080 050 060 040 140 120 160 080 120 160 030 010 050 130 05040005 210 100 200 140 060 200 170 030 140 180 040 060 070 020 020 110 030 040 010 220 230 170 190 010 05040004 120 010 180 020 05080002 010 010 020 030030 050 070 080 060 010 110 05030201 05030204 110 090 070 040 020 050 040 030 020 080 040 030 070 010 050 020 040 060 090 120 100 050 05060003 070 070 080 100 3 020 05090202 050 090 090 020 0 060 050 0 0 010 040 05060010002 020 010 8 080 080 0 05090203 090 5 080 090 100 100 100 0 070 060 080 030 030 140 060 05030202 130 110 020 020 110 020 090 090 030 130 090 050 040 120 040 120 120 100 05090201 040 05090101 050 030 100 150 160 080 110 040 05090103 010 080 070 050 140 060 090 060 040 020 010 100 010 070 8-digit hydrologic units 11-digit hydrologic units counties Ohio's 8 and 11-Digit Hydrologic Units Unit #, Hydrologic Unit Description 04100001, Lake Erie tributaries (below Detroit River [Michigan] to above Maumee River) 020, Maumee Bay tributaries (above Halfway Cr [Michigan] to above Maumee River) 04100002, Raisin River 030, Bear Creek (headwaters to Ohio/Michigan state line) 04100003, St. Joseph River 010, St. Joseph River (Ohio/Michigan state line to above West Branch) 020, West Branch St Joseph River 030, St. Joseph River (below West Branch to below Bear Creek) 050, Fish Creek 060, St Joseph River (below Bear Creek to Ohio/Indiana state line [except Fish Cr]) 04100004, St Marys River 010, St Marys River (headwaters to below Sixmile Creek) 020, St Marys River (below Sixmile Creek to below Twelve Mile Creek) 030, St Marys River (below Twelve Mile Creek to Ohio/Indiana state line) 040, Twentyseven Mile/Prairie Cr. and Little Blue Cr. (headwaters to Ohio/Indiana state line) 04100005, Maumee River 020, Maumee River (Ohio/Indiana state line to above Tiffin River) 04100006, Tiffin River 020, Bean Creek (Ohio/Michigan state line to below Mill Creek) 030, Tiffin River (below Mill Creek to below Leatherwood Creek) 040, Tiffin River (below Leatherwood Creek to above Lick Creek) 050, Lick Creek 060, Tiffin River (below Lick Creek to Maumee River) 04100007, Auglaize River 010, Auglaize River (headwaters to below Pusheta Creek) 020, Auglaize River (below Pusheta Creek to above Jennings Creek) 030, Ottawa River (headwaters to above Little Ottawa River) 040, Ottawa River (above Little Ottawa River to above Sugar Cr) 050, Ottawa River (above Sugar Cr to Auglaize River) 060, Auglaize River (above Jennings Creek to above Little Auglaize River) 070, Little Auglaize River (headwaters to above Dog Cr) 080, Prairie Creek 090, Little Auglaize River (above Dog Cr to Auglaize River [except Prairie Cr]) 100, Auglaize River (below Little Auglaize River to above Flatrock Creek) 110, Powell Creek 120, Auglaize River (above Flatrock Cr to Maumee River [except Powell Cr]) 04100008, Blanchard River 010, Blanchard River (headwaters to below Potato Run) 020, Blanchard River (below Potato Run to above Eagle Creek) 030, Blanchard River (above Eagle Creek to above Ottawa Creek) 040, Blanchard River (above Ottawa Creek to above Riley Creek) 050, Riley Creek 060, Blanchard River (below Riley Creek to Auglaize River) 04100009, Maumee River 010, Maumee River (below Tiffin R. to above S. Turkeyfoot Cr [except Auglaize R.]) 020, South Turkeyfoot Creek 030, Maumee River (below South Turkeyfoot Creek to above Bad Creek) 040, Bad Creek 050, Maumee River (below Bad Creek to below Beaver Creek) 060, Maumee River (below Beaver Creek to below North Granger Island) 070, Swan Creek (headwaters to above Blue Creek) 080, Swan Creek (above Blue Creek to Maumee River) 090, Maumee River (below North Granger Island to Lake Erie [except Swan Creek]) 04100010, Lake Erie Tributaries and Portage River 010, Wolf Creek, Cedar Creek, Crane Creek and Turtle Creek 020, Toussaint Creek 030, Middle Branch Portage River(headwaters to below Rocky Ford) 040, Middle Branch Portage River(below Rocky Ford to below South Branch) 050, Portage River (below confluence of South and Middle Branches to below North Branch) 060, Portage River (below North Branch to below Sugar Cr) 070, Portage R. (below Sugar Cr to Lake Erie) & Lake Erie Tribs (below Toussaint Cr to Marblehead) 04100011, Sandusky River and Sandusky Bay Tributaries 010, Muddy Creek and north shore of Sandusky Bay 020, Sandusky River (headwaters to above Broken Sword Creek) 030, Broken Sword Creek 040, Sandusky River (below Broken Sword Creek to above Tymochtee Creek) 050, Tymochtee Creek (headwaters to below Warpole Creek) 060, Tymochtee Creek (below Warpole Creek to Sandusky River) 070, Sandusky River (below Tymochtee Creek to above Honey Creek) 080, Honey Creek 090, Sandusky River (below Honey Creek to above Wolf Creek)P 100, Wolf Creek 110, Green Creek 120, Sandusky River (below Wolf Creek to Sandusky Bay) 130, South Shore Sandusky Bay Tribs (below Sandusky River to above Mills Cr) 140, South Shore Sandusky Bay Tribs (above Mills Cr to below Sawmill Cr) 04100012, Huron River and Vermilion River 010, West Branch Huron River (headwaters to above Slate Run) 020, West Branch Huron River (above Slate Run to above East Branch Huron River) 030, Huron R. (above East Br. to Lake Erie) and Lake Erie Tribs (below Sawmill Cr to below Huron R.) 040, Lake Erie tributaries (below Huron R. to above Vermilion R.) 050, Vermilion River (headwaters to above East Branch) 060, Vermilion River (above East Branch to Lake Erie) 04110001, Black River and Rocky River 010, Lake Erie tributaries (below Vermilion R. to above Black R.) 020, West Branch Black River (headwaters to Black River) 030, East Branch Black River (headwaters to below Coon Creek) 040, East Branch Black River (below Coon Creek to Black River) 050, Black R. (below East Br. to Lake Erie and Lake Erie Tribs below Black R. to above Porter Cr) 060, West Branch Rocky River (headwaters to Rocky River) 070, Rocky River (below West Br. to Lake Erie [including East Br.]) and Lake Erie Tribs from above Porter Cr to above Cuyahoga R. 04110002, Cuyahoga River 010, Cuyahoga River (headwaters to below Black Brook) 020, Cuyahoga River (below Black Brook to below Breakneck Creek) 030, Cuyahoga River (below Breakneck Creek to below Little Cuyahoga River) 040, Cuyahoga River (below Little Cuyahoga River to below Brandywine Creek) 050, Cuyahoga River (below Brandywine Creek to below Tinkers Creek) 060, Cuyahoga River (below Tinkers Creek to Lake Erie) 04110003, Chagrin and Ashtabula Rivers and Lake Erie Tribs 010, Lake Erie tributaries (below Cuyahoga R. to above Grand R.) 020, Chagrin River (headwaters to below Aurora Branch) 030, Chagrin River (below Aurora Branch to Lake Erie) 040, Lake Erie tributaries (below Grand R. and above Ashtabula R.) 050, Ashtabula River 04110004, Grand River 010, Grand River (headwaters to above Swine Creek) 020, Grand River (below Swine Creek to above Rock Creek) 030, Rock Creek 040, Grand River (below Rock Creek to above Mill Creek) 050, Mill Creek 060, Grand River (below Mill Creek to Lake Erie) 04120101, Conneaut Creek and Lake Erie tributaries 010, Lake Erie tributaries (below Ashtabula River to below Conneaut Creek) 060, Lake Erie tributaries (below Conneaut Creek to OH/PA stateline) 04120200, Lake Erie Islands 05030101, Little Beaver, Yellow, and Cross Creeks 070, Middle Fork Little Beaver Creek (headwaters to above West Fork Little Beaver Creek) 080, West Fork Little Beaver Creek 090, Little Beaver Creek (below West Fork to OH/PA state line) 100, Ohio River tributaries (below OH/PA state line to above Yellow Cr 180, Yellow Creek (headwaters to above Town Fork) 190, Yellow Creek (above Town Fork to Ohio River) 210, Ohio River tributaries (below Yellow Cr to above Cross Cr 340, Cross Creek 05030102, Shenango River 010, Pymatuning Reservoir (Shenango River) 030, Pymatuning Creek (headwaters to OH/PA stateline) 050, Yankee Run and Little Yankee Run 05030103, Mahoning River 010, Mahoning River (headwaters to below Beech Creek) 020, Mahoning River (below Beech Creek to below Berlin Dam) 030, Mahoning River (below Berlin Dam to below West Branch) 040, Mahoning River (below West Branch to above Duck Creek) 050, Mahoning River (above Duck Creek to above Mosquito Creek) 060, Mosquito Creek 070, Mahoning River (below Mosquito Creek to above Mill Creek) 080, Mahoning River (above Mill Creek to OH/PA state line) 05030106, Ohio River tributaries (Short, Wheeling, and McMahon Creeks) 010, Ohio River tributaries (below Cross Cr to below Short Creek) 040, Ohio River tributaries (below Short Creek to below Wheeling Creek) 100, Ohio River tributaries (below Wheeling Creek to below McMahon Creek) 110, Ohio River tributaries (below McMahon Creek to below Fish Cr W.V.) 05030201, Little Muskingum River 010, Sunfish Creek and Ohio R (below Fish Cr.