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THE ST. JOSEPH ALONG PENN'S NORTH EDGE
The St. Joseph River is the township's whole northern boundary, and the town exists because of where the creek meets it: Chapman fixes the river's entry into the county on this township's ground — it enters St. Joseph County on section 9, Township 37 North, Range 4 East (p. 338) — and Howard names the two south-bank streams it receives inside the township, Twin Branch Creek at the downstream end and Baugo Creek at the town (p. 292). Above the township the river comes down from Elkhart, where the Elkhart River joins it; below, at Mishawaka, it drops over the rapids where the Twin Branch dam now stands. No source reached for this section publishes a channel width or a fall figure for the Osceola reach itself; the river's general dimensions in the City of South Bend's 2018 flood-study record — a drainage of about 4,800 square miles, about 200 miles of length, and a slope of about 3 feet per mile from Hillsdale, Michigan, to Lake Michigan — are general river figures and are printed as such, not as measurements of this reach. The frontage's flood record is carried in its own article below, at the strength the record actually reaches.