https://www.google.co.uk/maps/@51.0695267,-4.1803198,3691m/data=!3m1!1e3
Hope this comes out
Appledore is to the lower left of the picture with the life boat in the river, Instow and beach across from Appledore to the right, Crow Point is the bit pointing towards Instow
In the pictures you can see behind the Cruiser Instow Oil Jetty, Tankers moor up there
You "could " cross there on the biggest of spring tides, but it would still be fairly deep in the channel, I'm only guessing but probably anywhere up to 3'
The mud in the river is very sticky and deep, as I've found out to my cost, having gone down to my waist, and there's sinking sand in places, (know from experience)
It's the 2nd fastest tide in England, fishing further upriver, I have been on the sand, the tide turned and a mini wave came upriver, I had to grab my rods and run to the bank, it can be quite scary at times