St. Marys River (Indiana and Ohio)

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Saint Marys River
Map of the Maumee River watershed showing St. Marys River
Origin Confluence of the East Branch and Center Branch of St. Marys River near St. Marys, Ohio
40°32′14″N 84°21′46″W / 40.5372222°N 84.3627778°W / 40.5372222; -84.3627778 (Saint Marys River origin)
Mouth Confluence with the St. Joseph River to form the Maumee River at Ft. Wayne, Indiana
41°05′00″N 85°07′56″W / 41.0833333°N 85.1322222°W / 41.0833333; -85.1322222 (Saint Marys River mouth)Coordinates: 41°05′00″N 85°07′56″W / 41.0833333°N 85.1322222°W / 41.0833333; -85.1322222 (Saint Marys River mouth)
Progression St. Marys River → Maumee River → Lake Erie → Great Lakes → St Lawrence River → Gulf of St. Lawrence
Source elevation 854 ft (260 m)
Mouth elevation 745 ft (227 m)
GNIS ID 442706

The St. Marys River (Shawnee: Kokothikithiipi [1]) is a 99-mile-long (159 km)[2] tributary of the Maumee River in western Ohio and eastern Indiana in the United States.[3] Prior to development, it was part of the Great Black Swamp. Today, it drains a primarily rural farming region in the watershed of Lake Erie.

It is formed in southern Auglaize County in western Ohio by the confluence of the short East Branch and Center Branch. It flows briefly west to St. Marys, approaching to within two miles of Grand Lake before turning to the north. In northwestern Auglaize County it turns sharply to the west-northwest, flowing past Rockford and Willshire into Adams County, Indiana. In northeastern Indiana it flows northwest past Decatur, then enters Fort Wayne. It hooks around in its last half mile (0.8 km) to join the St. Joseph River from the west to form the Maumee in downtown Fort Wayne.

The World War II-era US Navy vessel St. Mary's River was named after this river.

See also[edit]


  1. ^ "Shawnees Webpage". Shawnee's Reservation. 1997. Retrieved 2013-04-26. 
  2. ^ U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed May 19, 2011
  3. ^ U.S. Geological Survey Geographic Names Information System: Saint Marys River