North Rochester is a community in the city of Rochester, New Hampshire, United States, and is the site of the third leatherboard mill built by Jonas Spaulding. Jonas' sons were Leon C., Huntley N. and Rolland H., of whom Huntley N. and Rolland H. would serve as governors of New Hampshire. Geography North Rochester is located in the northern corner of the city of Rochester. The Salmon Falls River, which forms the border between New Hampshire and Maine, runs along the eastern edge of the community. The town of Milton, New Hampshire, is directly to the north. New Hampshire Route 125 (Milton Road) runs through the center of North Rochester, leading north to the center of Milton and south to downtown Rochester. The Spaulding Turnpike (New Hampshire Route 16) runs along a hillside on the western edge of the community. History Once his Milton New Hampshire Leatherboard Mill was running full, Jonas Spaulding explored for another site on which to expand the business. Ira Jones, a hydraulic engineer native to the area, directed Jonas to the old Cottles Woolen Mill site in North Rochester. At the time of Jonas' investigation the rippling water of the Salmon Falls River at the Cottles mill site was a feature on a pleasant day's buggy ride that followed a loop. Ruth Howland reported that the buggy ride would begin in Rochester with a drive up the Milton Road to North Rochester then a cross over the Salmon Falls River was made into Maine. The rippling water at the Cottles Mill site would be viewed on this crossing. The loop would then continue on the Maine side of the Salmon Falls River to East Rochester, there crossing the river to return to Rochester. Jonas decided this would be a good site and started construction on a second leatherboard mill on the Salmon Falls River. The first phase of the project was the construction of a canal with masonry walls. The canal ran and was wide. The masonry walls were thick. The next phase of construction was building a solid masonry mass square where the mill wheel was placed (see photo). Next, a dam was built on the Salmon Falls River that was long from abutment to abutment. The dam created Spaulding Pond on the river, which extends north for a mile into Milton. The factory building constructed for the mill measured and was four stories