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 (2.51 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).

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.

Namekagon River:

Namekagon Dam to Hayward Landing (color ND to H)  The well at Cable Wayside and Landing, a WI DOT, facility is currently not operational so no water is available.        
Hayward to Trego  (color H to T)                                                         
Trego to Riverside  (color T to R)

St. Croix River

Gordon Dam to Riverside Landing  (color GD to R)  The well at Riverside is not operational
Riverside Landing to Sand Creek Landing  (color R to SCL)  The well at Riverside is not operational
Sand Creek Landing to Highway 70  (color SCL to H70)The well at Nelsons is not operational
Highway 70 to Highway 8  (color H70 to H8) *The vault toilet at Old Railroad Bridge was destroyed by vandals and will not be replaced during the summer 0f 2011
Highway 8 to Osceola (color H8 to O)
Osceola to the High Bridge (color O to HB)
High Bridge to Boom Site Landing (boaters)  (color HB to BL)

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