A perfect example of rocks put in a river is the Argo Dam bypass on the Huron River.
The project was begun at the end of the
summer and the race re-opened about a week ago.
Some of the construction
crew took kayaks out on the water as soon as the
stones were in place.
The water in the race can be controlled
by increasing or decreasing water going over the Argo Dam.
In the spring an asphalt path along the river
will be put in .
work on the river itself depends on DTE Energy.
The complete article can be seen here -
There is a slot - along with eddy's on the left and right .