Michigan Watershed Codes
(8-digit hydrologic units)
Code Name Code Name
04010302 Bad-Montreal Rivers 04020101 Black-Presque Isle Rivers 04020102 Ontonagon River 04020103 Keweenaw Peninsula 04020104 Sturgeon River 04020105 Dead-Kelsey Rivers 04020201 Betsy-Chocolay Rivers 04020202 Tahquamenon River 04020203 Waiska River 04030106 Brule River 04030107 Michigamme River 04030108 Menominee River 04030109 Cedar-Ford Rivers 04030110 Escanaba River 04030111 Tacoosh-Whitefish Rivers 04030112 Fishdam-Sturgeon Rivers 04040001 Little Calumet- Galien Rivers 04050001 St. Joseph River 04050002 Black-Macatawa Rivers 04050003 Kalamazoo River 04050004 Upper Grand River 04050005 Maple River 04050006 Lower Grand River 04050007 Thornapple River 04060101 Pere Marquette-White Rivers 04060102 Muskegon River 04060103 Manistee River 04060104 Betsie-Platte Rivers 04060105 Boardman-Charlevoix Rivers
04060106 04060107 04070001 04070002 04070003 04070004 04070005 04070006 04070007 04080101 04080102 04080103 04080104 04080201 04080202 04080203 04080204 04080205 04080206 04090001 04090002 04090003 04090004 04090005 04100001 04100002 04100003 04100006 07120001
Manistique River Brevort-Millecoquins Rivers St. Marys River Carp-Pine Rivers Lone Lake-Oqueoc River Cheboygan River Black River Thunder Bay River Au Sable River Au Gres-Rifle Rivers Kawkawlin-Pine Rivers Pigeon-Wiscoggin Rivers Birch-Willow Rivers Tittabawassee River Pine River Shiawassee River Flint River Cass River Saginaw River St. Clair River Lake St. Clair Clinton River Detroit River Huron River Ottawa River-Stony Creek River Raisin East Branch St. Joseph River Tiffin River Kankakee River