Appellees, plaintiffs below, under licenses issued by the state of Washington, oj)erate fish traps in the Columbia river, and contend that the locations of the traps are within the territorial jurisdiction of that state. Defendants appellants deny that the traps are located within the jurisdiction of Washington, and allege that they are within the state of Oregon. The District Court held that the traps were located within the jurisdiction of Washington, and issued injunction against interference. Defendants, who are fish commissioners of the state of Oregon, appealed.

Reduced to a short statement, appellants’ position is that about the points of location of the traps the middle of the channel of the Columbia has shifted northward until it is now between Puget Island and the fish traps; that such change has resulted from erosion of the shore of Puget Island, and the formation of shoals or sand bars on the Oregon side; and that the boundary between Washington and Oregon lias correspondingly changed.

In the act of Congress admitting Oregon into the Union (Act Feb. 14, 1859, 11 Stat. 383 ), the boundary was fixed as follows: “Beginning- one marine league at sea due west from the point where the forty-second parallel of north latitude intersects the the same; thence northerly, at the same distance from the line of the coast, lying west and opposite the state, including all islands within the jurisdiction of the United States, to a point due west and opposite the middle of the north ship channel of the Columbia river; thence easterly, to and up the middle channel of said river, and, where it is divided by islands, up the middle of the widest channel thereof, to a point near Port Walla Walla.” Section 1.

The boundary of the state of: Washington was fixed by article 24, § 1, Constitution, of Washington (2 Hill’s Ann. St. & Codes, *70 p. 851), as follows: “Beginning at a point in the Pacific Ocean one marine league due west of and opposite the middle of the mouth of the north ship channel of the Columbia river; thence running easterly to and up the middle channel of said river and where it is divided by islands up the middle of the widest channel thereof to where the forty-sixth parallel of north latitude crosses said river near the mouth of the Walla Walla river.”

We gather from the evidence that the traps are located in a part of the Columbia river where it is divided into two channels by Puget Island which belongs to the State of Washington, the channel south of the island being the wider of the two. The locations are at points which were formerly in the exposed area of Puget Island on the Washington side. After 1887 the southern shore of Puget Island slowly eroded and the shore line moved northward approximately 1,000 feet or more, with the result that the river was widened and the center of the channel "moved north to some extent. For a long time prior to 1894 .the middle of the channel of the Columbia was at a considerable distance south of the point where the fish traps are located, and certainly until about 1894 the only navigable channel in the immediate vicinity of the traps was south of the points where the traps are located.

Years ago, between 1859 and 1874, in the southern shore of Puget Island there was a slough running in a north westerly direction from the Columbia river. The slough, although only used by fishing boats, had a channel that was shallow and more or less filled with snags. So much of the area of Puget Island as was separated from the mainland by this slough was called Coffee Island, which gradually became submerged. Some time before 1894 the water of the river began to bore out and enlarged the slough, and when freshet waters of 1894 came the slough was so enlarged that a channel formed, which after 1894 was used for navigation. After this new channel was created, shoals formed to some extent on the south, or Oregon, side of Coffee Island, and navigation on that side became unsafe for deep draft ships, but there is no evidence of any erosion of the Oregon shore. In 1893 government engineers endeavored to deepen the channel between Coffee Island and Puget Island, but in' 1925 they abandoned their efforts and dredged a new channel close to the Oregon shore.

Our opinion is that the creation of the slough channel was not by erosion, but was avulsion, and therefore did not affect the boundary- of the states. This view is strengthened by the opinion of the court in Nebraska v. Iowa, 143 U. S. 359 , 12 S. Ct. 396 , 36 L. Ed. 186 , where it was said to be well settled that, “where a stream, which is a boundary, - from any cause suddenly abandons its old and seeks a new bed, such change of channel works no change of boundary, and that the boundary remains as it was, in the center of the old channel, although . no water may be flowing therein. This sudden and rapid change of channel is termed, in the law, avulsion. In Gould on Waters, § 159, it is said: ‘But if the change is violent and visible, and arises from a known cause, such as a freshet, or a cut through which a new channel is formed, the original thread of the stream continues to mark the limits of the two estates/” In re Buffalo, 206 N. Y. 319 , 99 N. E. 851 .

Nor does the fact of the shoaling and elevation of the bottom of the river affect the question, for it is laid down in Washington v. Oregon, 211 U. S. 127 , 29 S. Ct. 47 , 53 L. Ed. 118 , that the center line does not mean the deepest channel; nor that the boundary is defined by the widest navigable channel. In that ease the court said:

Again, in an opinion denying a rehearing ( 214 U. S. 205 , 29 S. Ct. 631 , 53 L. Ed. 969 ), the court expressed its agreement with the contention that the term “widest channel” does not mean the broadest expanse of water, and said: “There must be in the first instance a channel — that is, a flow of water— deep enough to be used and in fact used by vessels in passing up and down the river; but it does not mean the deepest channel, but simply the widest expanse of water which can reasonably be called a channel.”

The applicability of these decisions is direct. They lead to the conclusion that, though by erosion of Puget Island the river has widened and the center of the old channel has been changed somewhat, and has become more shallow than it was at the time of the fixing of the boundary of the state of Oregon, such changes are not to he confused with changes made by the creation of the slough channel, -which was caused by sudden and known causes, not by accretion. The demarking line must therefore remain the center of the channel between Puget Island and Oregon before the avulsion.

The deeree of the District Court is affirmed.