Beginning in the middle of the main channel of the Mississippi River, opposite the mouth of the river Cuivre; thence up said river Cuivre, in the middle of the main channel thereof, to the mouth of Eagle Fork (Big Creek); thence up Eagle Fork (Big Creek), in the middle of the main channel thereof, to the line of the fifth principal meridian; thence with said meridian line to the township line between townships forty-seven and forty-eight; thence west with said township line to the southwest corner of section thirty-five, township forty-eight, range two, west; thence north with the subdivisional lines to the northwest corner of section fourteen, township forty-eight, range two, west; thence west with subdivisional lines to the southwest corner of section seven, township forty-eight, range two, west; thence north with the range line between ranges two and three, west, to the southeast corner of section twenty-four, township forty-nine, range three, west; thence west with the subdivisional lines to the southwest corner of section twenty-one, township forty-nine, range three, west; thence north with the subdivisional lines to the northwest corner of section four, township fifty, range three, west; thence east with the township line between townships fifty and fifty-one to the northeast corner of township fifty, range three, west; thence north with the range line between ranges two and three, west, to the northwest corner of township fifty-one, range two, west; thence east with the township line between townships fifty-one and fifty-two to the middle of the main channel of the Mississippi River; thence down said river, in the middle of the main channel thereof, to the place of beginning.