DCHP-1 Online
Grand River Hist. 
an early name of the Ottawa River, taken over from the French-Canadian explorers.
- 1792 (1911) [We] saw the junction of the Ottawa or Grand River which divided Upper and Lower Canada with the St. Lawrence. . . .
- 1883 It is quite a common thing when you are speaking to these backwoods river-men about the Ottawa, for them to ask "is it the Grand River you mean?" for by this and no other name will they recognize and designate it.
- 1933 How long since they had left behind the huge rafts of square timber . . . on the smooth bosom of "the grand river," as it was often called. . . .
- 1792 (1911) [We] saw the junction of the Ottawa or Grand River which divided Upper and Lower Canada with the St. Lawrence. . . .