A limnological survey was conducted during 17-18 September, 1998 to characterize the trophic state of Russell Pond, a 15.8 Ha natural Lake located in Woodstock, Grafton County, New Hampshire. Physical, biological and chemical parameters were measured to assess the health of the lake and changes from previous studies. Russell Pond is oligotrophic with high Secchi disk depths (13.8 m), low phosphorus levels (3.8 µg L1) and low Chlorophyll a concentration (0.5 µg L-1). Peridinium (Dinophyceae) dominated (64%) the net phytoplankton. Calanoid copepods (Diaptomidae) constituted 87.5% of the crustacean zooplankton. The lake is at risk for acidification because of low acid neutralizing capacity (1.2 mg CaCO3 L-1) and low pH (5.6) in the deep water. Russell Pond has exceptionally high water clarity due to the low phytoplankton density and low water color (6.9 CPU). Water quality of the lake has been stable over the past few years. Compared to data from four other New Hampshire lakes, Russell Pond is the most oligotrophic of the lakes, followed by Pleasant Lake and Stonehouse Pond. Great Pond and Townhouse Pond were the most mesotrophic of the lakes.

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UNH Center for Freshwater Biology Research

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