Statistics for occurrence #1 of “Niagara River” in chapter 2, page 164 of George Bancroft, History of the United States from the Discovery of the American Continent, Vol. 3, 15th edition.:

...y on which he traversed its shallow waters; and, after escaping from storms on Lake Huron, and planting a trading-house at Mackinaw, he cast anchor in Green Bay. Here having despatched his brig to Niagara River , with the richest cargo of furs, he himself, with his company in scattered groups, repaired in bark canoes to the head of Lake Michigan; and at the mouth of the St. Joseph's, in that peninsula where ...
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Entity Corpus Doc Corpus Doc  
Niagara River (New York, United States) 166 6 0 0 0 user votes

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