Editing Middlesex Canal (section)

===Merrimack canals===
A variety of enterprises by all or a few of "the proprietors of the Middlesex Canal"{{efn |"The proprietors of the Middlesex Canal" which were the corporation's stockholders, as titled in the enabling act of 1793. }} which were the corporations' principal stockholders and the board came together with other third parties or acted in a few cases as a combined whole to fund the development of other stretches of the canal up the Merrimack above Chelmsford.<ref name=ROBCh-IX>Roberts, Chapter IX, ''The Merrimack River Canals'', pp. 124–135</ref> By the completion of construction between Medford and Chelmsford, several extensions envisioned all along were also nearing completion. The whole system was complete in 1814,<ref name=ROBCh-IX/> and with just a few exceptions, overall came to operate with prices and regulations as set by the proprietors of the (main) Middlesex Canal. The following extensions opened up the balance of the Merrimack River to the [[New Hampshire]] capital, [[Concord, New Hampshire|Concord]], which acted as a staging point for riverine traffic deep into the river system penetrating the [[White Mountains (New Hampshire)|White]] and [[Green Mountains]] of New Hampshire and [[Vermont]] respectively.

{| cellspacing=1 cellpadding=1 border=3
!colspan=4 | The Merrimack River Canals (Chapter IX title)<ref>{{cite book|last=Roberts
|first=Christopher
|title=The Middlesex Canal 1793–1860
|url=https://archive.org/details/middlesexcanal170000robe
|url-access=registration
|publisher=Harvard University Press, Harvard Economic Studies, Volume LXI, 386 R
|location=Cambridge, Massachusetts
|year=1938
}}</ref>
|-
! Adjunct name
! Year<br />completed
! Length
! Locks
|-
| Wicasee Canal ||1813|| short || one
|-
|Cromwell's Canal ||1813|| short || one
|-
|Union Locks and Canals ||1808|| nine miles|| seven
|-
|Amoskeag's Canal <br />(formerly Blodget's Canal)|| 1807|| short || four to seven <br />at various times
|-
|Hookset Canal||1813||6.25 miles || three
|-
|The Bow Canal <br />(Garven's Falls) ||1813 || 0.75 miles || four
|-
|}

{{see also|List of New Hampshire historical markers (126–150)#132}}