Here are maps in three different scales. A general overview map, the official park map, which has some detail, and river section maps. You can select which map best serves your needs.
Overview map of Riverway and area .pdf (142 KB) It shows the Riverway, the states, towns and major roads.
Detailed park map-(this is a large (5.9 MB) .pdf file and takes some time to load up. The map, when printed at 50%, will fit on 8 1/2 x 11" paper or print to fit paper.).
River Section Maps: These Black and white maps (.pdf files) provide the most current information on landings, campsite locations and the availability of water, for the ten sections that the rivers have been divided into. On the backside of each map is information which includes safety and regulations. A color version is also included following each map which may be easier to look at online.
The MN DNR publishes "Metro Area Rivers Guide" which includes the area below the Boomsite, which is in the state zone of the Riverway(pg 41). An online pdf version of this guide is available here