For one-quarter of a mile above its mouth the river maintains an average width of one hundred and fifty yards, and a depth of two and one-half fathoms. It then expands into a shallow sheet of water two miles wide and three miles long, known locally as “The Little Lake.” At the head of this small expansion the river again contracts where it flows out of Grand Lake. This point is known as “The Rapids,” and although there is a strong current, the stream may be ascended in canoes without tracking.
At the foot of “The Rapids” the effect of the spring tides is barely perceptible. Between Grand Lake and the head of Hamilton Inlet, Northwest River flows through a deposit of sand marked by several distinct marine terraces.
Grand Lake is a body of fresh water forty miles long and from two to six miles in width, having a direction N. 75 degrees W. It lies in a deep valley between rocky hills that rise to a height of about four hundred feet above the lake, and was doubtless at one time an extension of Hamilton Inlet. At Cape Corbeau and Berry Head the rocks rise almost perpendicularly from the water; at the former place, to a height of three hundred feet. Except in a few places the hills are covered to their summits by a thick growth of small spruce and fir.
At the head of the lake there are two bays, one extending slightly to the southwest, the other nearly due north. Into the former flow the Susan and Beaver Rivers, while into the latter empties the water of the Nascaupee and Crooked Rivers. Besides these there are two small streams, the Cape Corbeau River on the south, and Watty’s Brook on the north shore.
At the point where the Nascaupee and Crooked Rivers enter the lake there are two low islands of sand, and a great deal of sand is being carried down by the two streams and deposited in the lake, which is very shallow for some distance from the shore.
Three miles above the mouth of the Nascaupee River it is separated from the Crooked River by a plain of stratified sand and gravel, three-quarters of a mile wide, with two well-defined terraces. The first is twenty feet above the river and extends back some three hundred yards to a second terrace, rising seventy-five feet above the first.
Half way between this terrace and the Crooked River is, the old bed of the Nascaupee River, nearly parallel to its present course. A similar abandoned channel curve was found, making a small arc to the south of the Crooked River.
Above Grand Lake the Nascaupee River flows through an ancient valley, which is from a few hundred yards to a mile wide and cut deep into the old Archaean rocks, affording an excellent example of river erosion. The banks are of sand, and in some places clay, extending back to the foot of the precipitous hills. Apparently the ancient river valley has been partly filled with drift, down through which the river has cut its way; the present bed of the stream being of post glacial formation. The general direction of the river is N. 83 degrees W.
Fifteen miles above Grand Lake, the Red River joins the main stream, coming from N. 87 degrees W. Below its junction with the latter stream, the Nascaupee River has a width varying between two and three hundred yards, and an average depth of about ten feet.
The Red River is two hundred feet wide, and its water, unlike that of the main stream, has a red brown color, like that of many of the streams of Ontario which have their source in swamp or Muskeg lands.