Here is a site I like to use in monitoring the River levels. It shows many rivers through out the region. You just have to scroll through to find what your looking for.
Take note of the MN river from Mankato through Savage.
You will watch a swell sweeping through and dropping as it moves from city to city.
Just a word of caution. If you decide to head out in a boat in any of these areas when its on the rise or cresting. Keep a close eye out. You will find the most wood floating through. And don’t get yourself stuck somewhere. ( I know its obvious but I still like to put the word of caution out.)
http://www.crh.noaa.gov/ahps2/area.php?wfo=mpx&view=1%5DNational Weather Service Link<<