Oxford Tree-Ring Laboratory - New Jersey

New Jersey

Ackerman-Dewsnap (Bishop) House

Ackerman-Dewsnap (Bishop) House and Barn, Saddle River, New Jersey (41.033382, -74.099480))

Primary House Felling Dates: Spring 1833, Winter 1832/3

Secondary BarnWinter 1890/1


Site Master 1721-1832 (white oak) BHNJx1 (t = 5.27 SRNJx1; 5.27 HOLL2016; 4.99 PHNJx2). Individual Sample 1729-1890 (yellow pine) bhnj11 (t = 10.93 PA013; 6.37 NY045; 6.08 PA004).

The Ackerman-Dewsnap (Bishop) House is one of 25 historic structures in the Borough of Saddle River listed on both the New Jersey and National Registers of Historic Places. The house was originally built circa 1835 on the farm of Garret Ackerman, whose homestead is two-tenths of a mile north at 199 East Saddle River Road. The house was sold in 1864 to James Dewsnap, who built an addition in 1870. Further renovations were made by the Bishop family after World War II. The house was purchased by the borough in 1980, and it briefly served as the municipal building when Borough Hall had a fire in 1981. Bishop House was added to the National Register of Historic Places in 1986. (Building description courtesy of Barton Ross.)

Dendrochronological analysis has shown that the house was constructed from timbers felled in the winter of 1832/3 and the spring of 1833, while the secondary phase of the barn was constructed using a timber felled in the winter of 1890/1.

Worthington and Seiter 2021 "The Tree-Ring Dating of the Ackerman-Dewsnap (Bishop) House and Barn, Saddle River, New Jersey," Oxford Tree-Ring Laboratory 2021/29.




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Contact Information

Oxford Tree-Ring Laboratory

Michael Worthington
Jane Seiter, Ph.D

25 E. Montgomery St.
Baltimore, MD 21230