The flow of the Chicago River was changed so waste dumped into the river would flow into the Mississippi River instead of into Lake Michigan where most of the Chicago area gets its drinking water.
Actually it was to end pollution in Lake Michigan but also to connect it with the Mississippi River.
lake michigan
Lake Michigan
A sandbar had built up at the original mouth of the Chicago River, where it flowed into Lake Michigan, causing the river to bend southward for about a quarter of a mile before flowing into the lake. In the 1830s, soldiers from Fort Dearborn dug out a straightened channel to allow lake boats better navigation into the river. South of downtown, the river curved eastward almost to Clark Street. This complicated the approach into downtown stations for railroads running alongside the river, and prevented the extension of downtown streets southward. The 1909 Plan of Chicago suggested straightening this bend, and this was done between 1927-1929. A new channel was dug, new bridges were built, and then the old channel was filled in.
Normally a lake does not flow: that is what distinguishes a lake from a stream or river.
The river with its source at the confluence of the Bois de Sioux River and Otter Tail River does flow into to Lake Winnipeg
Into Lake Thun.
Lake Oconee
It flows into Lake Huron via the Straits of Mackinac.
Usually another river or the sea or a lake
Usually another river or the sea or a lake