The Lower Columbia River Water Trail Web Site should not be used for navigation purposes. Paddlers should consult and carry the applicable National Oceanic Atmospheric Administration (NOAA) Marine Charts for the lower Columbia River when our paddling the river. Charts show undulations of the coastline in detail, as well as underwater rocks, mud flats, aids to navigation and details like powerlines and bridges. For additional details, paddlers should carry topo maps as well. Maps are better at showing the landscape's elevation, contours such as valleys and mountains, plus the location of town, roads, houses, and other 

The following six NOAA charts cover the 146 miles of the Lower Columbia River Water Trail.

NOAA Marine Chart 18531 - Bonneville to Vancouver (RM 146 - 107)
NOAA Marine Chart 18526 - Port of Portland, Including Vancouver, Multnomah Channel-Southern Part
NOAA Marine Chart 18525 - Vancouver to St. Helens (RM 107 - 87)
NOAA Marine Chart 18524 - St. Helens to Crims Island (RM 107-87)
NOAA Marine Chart 18523 - Crims Island to Harrington Point (RM 56 -24)
NOAA Marine Chart 18521 - Harrington Point to Pacific Ocean (RM 24 - 0)

Paper copies of NOAA Marine charts for the Lower Columbia River are available at many local paddling shops and through a number of on-line sources.