Sentence:  With these completed and ice gone from the St. Peter's River ( present-day Minnesota river ) their 250 bushels of wheat , 100 bushels of oats and barley and 30 bushels of peas and some chickens were loaded onto the flat-bottomed boats and rowed up the <WSD>river</WSD> to Big Stone Lake , across into Lake Traverse , and down the Red . 
Meaning of the word marked with <WSD> tags:  a large natural stream of water (larger than a creek)