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Source in Hillsdale County, Michigan · mouth at St. Joseph / Benton Harbor, Michigan · the bend at South Bend
The St. Joseph River of Lake Michigan (USGS GNIS ID 1624891) rises at Baw Beese Lake in Hillsdale County, Michigan, and ends in Lake Michigan at St. Joseph and Benton Harbor, Michigan. Its course is a great S. From the Hillsdale County headwaters it runs generally west through southern Michigan — Hillsdale, Jonesville, Litchfield, Tekonsha, Union City, Colon, Mendon, Three Rivers, Constantine — then dips south across the state line into northern Indiana through Bristol, Elkhart, Mishawaka, and South Bend; at South Bend it makes the turn that named the city, bending north, re-entering Michigan in southeastern Berrien County, and running through Niles, Buchanan, and Berrien Springs to the lake. The Michigan Department of Natural Resources' Technical Report 75-9 (Shepherd, October 1975) describes the same course in the river's own terms: it "rises in Baw Beese Lake in northern Hillsdale County," flows "in a large arc north (the northbend)," then through the "southbend through Elkhart and St. Joseph counties," and "reenters Michigan in southeastern Berrien County," sweeping "in a large S curve 210 miles long with a fairly uniform drop of 570 feet." The Friends of the St. Joe River Association gives 210 miles, two crossings of the Indiana–Michigan line, 1,631 miles of significant tributaries, about 600 feet of fall, and 1,685 square miles of the watershed in Indiana.
The length conflict in the standard record is printed whole, not reconciled: the river's reference entry gives 210 miles (340 km) in its summary figures and 206 miles (332 km) in its text. The drainage basin is 4,685 square miles (12,130 km²) — the third-largest watershed draining to Lake Michigan — across fifteen counties, eight in Michigan and seven in Indiana, the Indiana seven including St. Joseph, Elkhart, DeKalb, Kosciusko, LaGrange, Noble, and Steuben.
Even the source carries a dispute, and it is printed whole. A November 2026 Project Scroll piece, "Where the River Begins," reports that the old books give four answers for the head of the river: Baw Beese Lake (also called St. Joseph Lake); Lake Pleasant and the chain of lakes above it; Bundy Hill — the 1900 U.S. Geological Survey report's "Bunday Hills, in northern Hillsdale County"; and Wheatland Township. The state fisheries report of 1999 cuts the question operationally: the "headwater section is from Baw Beese Lake to Union City." The gauge below the lake, at Lakeview Road some 300 feet downstream, drained 5.10 square miles in 1977; the Fayette Street bridge gauge in Hillsdale drained 12.4. The working answer — Baw Beese Lake — is the one the fisheries record and the modern references use; the older answers stand in the record beside it.
Two rivers, one name. Indiana holds a second St. Joseph River, and the two are not branches of one stream but entirely separate rivers that happen to share a name and nearly share a birthplace. The other St. Joseph River (GNIS ID 2678706) also rises in Hillsdale County, Michigan — the headwaters of its East Branch lie within about three miles of the Lake Michigan river's headwaters, "within 5 miles" in the Lake Michigan river's own entry — but it flows the other way: south and east, forming at the confluence of its East and West branches in northern Williams County, Ohio (41°38′54″N, 84°33′55″W), and ending at the Maumee River in Fort Wayne, Indiana. Its length is likewise printed in two figures: about 100 miles (160 km) in its summary, 86.1 miles (138.6 km) in its text. The Encyclopaedia Britannica (updated November 12, 2024) states the disambiguation outright: the 210-mile Lake Michigan river is "not to be confused with another Saint Joseph River, which also rises near Hillsdale and flows generally south for 100 miles … to form the Maumee River in Indiana."
The name itself has a sequence, given by Otto M. Knoblock's 1925 navigation history (dug whole at art-74-4): the river was first "The river of the Miamis," later "St. Joseph's river of the Lakes," then shortened to St. Joseph's, and finally St. Joseph. The bend and the confluence that made the city on this ground's border are the South Bend turn itself — where the west-flowing river bends north for the lake — and, just above it, the St. Joseph–Kankakee portage at the head of the Kankakee River, the carry that made the bend a trading place from the seventeenth century (art-74-4).
Granger's share is stated exactly: none of the main stem. No reach of the St. Joseph River touches the CDP in Clay and Harris townships. What Granger holds is the basin frame and two tributaries — Juday Creek, which reaches the river at South Bend, and Willow Creek, on the Mishawaka side (art-74-3). Every main-stem fact in this section is boundary material at the size the audit rows direct; the creeks are Granger's own.