D & R Canal Map
http://www.imtrails.com/dnrcanalmap/
Invasion of the Japanese Knotweed in the Lamprey River Watershed
http://www.mappler.com/lamprey
Greater Columbia River Water Trail
http://www.mappler.com/gcwt_wenatchee
Mississippi River Trail
http://www.imtrails.com/mrt
See an example MRT interactive map below: