There is a wealth of hydrographic data available on the internet for the ICW. There are many federal and state agencies engaged in hydrographic data gathering and dissemination.
At the Federal Level:
US Coast Guard
US Army Corps of Engineers
US Geodetic Survey
NOAA
The water levels along the ICW are influenced by many factors including tidal flows, wind, and local river and stream flows which are highly influenced by rain in areas remote to the ICW.
Prudent Action
A boater should check the hydrographic data available for or near the section of ICW being transited.
Hydrographic Data from Water Level Gages
Main Sites
USGS Water Level Gage Data
https://waterdata.usgs.gov/nwis
USACOE Water Level Gage Data
http://rivergages.mvr.usace.army.mil/WaterControl/new/layout.cfm
Areas Along the ICW
Map of NOAA water level gages in VA, Norfolk to Coinjock
https://water.weather.gov/ahps/
Map of NOAA water level gages in NC
https://water.weather.gov/ahps2/index.php?wfo=mhx
Map of NOAA water level gages in SC
https://water.weather.gov/ahps2/index.php?wfo=chs
Map of hydrograhs in central Florida
https://water.weather.gov/ahps2/index.php?wfo=mlb
Specific Hydrographs along the ICW
North Landing R Near Creeds
https://water.weather.gov/ahps2/hydrograph.php?wfo=akq&gage=nlrv2
North Landing R @ Chesapeake & Ablemarle Canal
https://water.weather.gov/ahps2/hydrograph.php?wfo=akq&gage=cacv2
NOAA hydrograph on Pungo River near Belhaven
https://water.weather.gov/ahps2/hydrograph.php?wfo=mhx&gage=blhn7
Updated: 29 October 2018