Sea-going vessels were able to sail to Hanovertown in the 18th c and to
Newcastle up until the 1830s.  There is an interesting article with sketch
maps in "The Port Towns of the Pamunkey" by Malcom H. Harris. William and
Mary College Quarterly Historical Magazine, 2nd Ser., Vol. 23, No. 4. (Oct.,
1943), pp. 493-516. I obtained it through JSTOR.

I went up there by john-boat about 8 years ago and it is heavily silted-in.
 Hard to imagine a schooner making it up (much less turning around). 

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