Upper Maumee



The Upper Maumee Watershed is delineated by the United States Geological Survey (USGS) as 8-digit hydrologic unit number 04100005. This 250,664 acre (392 square mile) watershed is located in northeastern Indiana in Allen and DeKalb counties in Indiana, and Defiance and Paulding counties in northwestern Ohio. (Figure E-1). The watershed contains approximately 434 miles of tributary perennial streams. The Maumee River originates at Fort Wayne, Indiana flowing to Defiance, Ohio where it merges with the Tiffin,

Auglaize and Blanchard Rivers. It continues on in a northeasterly

direction forming the Lower Maumee River to Toledo, Ohio, where it empties into Lake Erie.


Quick Facts


  • Watershed Area – 392 square miles
  • Empties To – N/A
  • Largest Cities – Fort Wayne, Indiana. Defiance, Ohio
  • Watershed Counties – Indiana – Allen and Dekalb. Ohio – Defiance and Paulding.


Getting Local


Several local organizations play a role in watershed stewardship in the St. Mary’s watershed. Among them is the Maumee River Basin Partnership of Local Governments.





Studies & Reports


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