About Otsego Lake
OTSEGO LAKE WATER QUALITY DATA
See The Plan for the Management of the Otsego Lake Watershed
O-TE-SA-GA or Otsego Lake?
Native Americans inhabiting the Otsego Lake watershed called the lake O-TE-SA-GA. It provided them with an abundance of food and water. It is certainly our area's greatest natural resource. Currently, Otsego Lake's 74 square mile watershed is home to more than 5,000 people, enjoying its beauty and bounty. The Lake is also the beginning or “headwaters” of the mighty Susquehanna River, which runs from our Leatherstocking Country via Pennsylvania to the Chesapeake Bay. It is the single largest fresh-water source for that magnificent bay.
Otsego Lake's Geology
Ten thousand years ago Otsego Lake was formed when a tongue of the continental glacier scoured out the Susquehanna River Valley and the Finger Lakes Region. Glacial scouring exposed limestone which has protected the lake by neutralizing the effects of acid rain. The limestone in the watershed and basin of Otsego Lake are dissolved by the waters flowing into it where it settles to the lake bottom as a white marl.
Stratified Lake Sediments (Click Thumbnail to Zoom)
Otsego Lake Water Quality Data
BFS Staff monitor Otsego Lake bi-weekly throughout the year (monthly when it's frozen) for a variety of physical and biological parameters. Some of the results of this routine monitoring will be available here, updated sporadically. Follow the link below to see past water quality monitoring updates. You will need Adobe Acrobat Reader (free download) to view these files.
Description of Monitoring Procedures
Past water quality updates
Conditions in Otsego Lake as of 18 April 2015: The lake is ice-free as of 18 April, ending the winter with a total of 85 days of ice-cover (23 January through 18 April). Average annual duration of ice cover over the last 165 years was 88 days. A report containing the complete dataset of ice on, off, and days of cover was included in the 2013 BFS Annual Report. The graph below illustrates the days of ice cover each year from 1850 to 2015 (gray dots), the mean for each decade (blue circles) and a trendline describing the relationship between ice cover and time - mean decadal ice cover has decreased overall since record-keeping began in 1850.
The long-term nature of this dataset is valuable for assessments of climate change. Otsego Lake's ice dataset has been used by researchers from the US Environmental Protection Agency (see the Lake Ice exerpt here), in an analysis of climate change indicators, as well as by The Carey Institute for Ecosystem Studies and New York City Dept. of Environmental Protection to assess change over time and develop models to aid in the prediction of future ice conditions in the New York City water supply reservoirs.
The “Real” Otsego Bass
William Cooper arrived at the south end of Otsego Lake in 1785 and founded the settlement that was to become Cooperstown. The original 200 families nearly starved one spring. Cooper wrote that, “unusual shoals of fish were seen moving in the clear waters of the Susquehanna... I was surprised to find that they were herrings... In less than two days each family had an ample supply.” Those fish were probably shad, which are like herring and a close relative of the Otsego bass.
Otsego bass are actually whitefish which are native to the lake. However, in the 1900s hundreds of thousands of other whitefish were added to augment native populations. The Otsego bass -- also called greybacks or humpbacks by local anglers -- are a close relative of the cisco which had been introduced inadvertently when whitefish populations were being augmented. The cisco have declined dramatically in recent years because of the illegal introduction of alewives, another herring-like fish. The alewife population exploded and severely reduced the cisco food source; in recent years, predation on alewife by stocked walleye has drastically reduced the alewife population. A shift in the forage base for game fish is underway and the stage may be set for a rebound of Otsego Bass. Lake whitefish successfully spawned in 2014 and multiple size classes were obtained via anglers and NYS DEC netting efforts.
While Otsego bass and cisco are no longer the focus of anglers, the lake supports many game fish. These include lake trout, walleye, brown trout, Atlantic salmon, large and small mouth black bass, rock bass, sunfish, chain pickerel, yellow perch, carp and bullhead.
The Food Web at the Bottom of Otsego Lake
Plankton serve as the basis of the food web for those animals living in the open water of the lake, but an entirely different assemblage of organisms lives on the bottom. In shallow water, many species of rooted aquatic plants and algae live, transforming the sun’s energy and providing food and cover for a whole diversity of small animals which are fed upon by the larger fish. Plant plankton, which form the basis of a lake's food chain, reflect the green color of all plants which fix energy from the sun.
In deep water, dead plankton rain down from above. Their remains are food for the pea clams, midge larvae (bloodworms) and freshwater earthworms that occur by the millions. In turn, these animals serve as food for the Otsego bass, lake trout and other bottom feeding, cold-water fish.
In 2007, zebra mussels (Dreissena polymorpha) were discovered in Otsego Lake and are likely to result in changes to the food web within the lake system. The BFS is monitoring the colonization of substrates (lake bottom, boat hulls, docks, etc.) by zebra mussels in order to provide area residents with timely information that will help them to protect themselves and their personal property (boat engines, plumbing, etc.) from zebra mussel-related impacts. Dr. David Wong, a faculty member in the Biology Department as of fall 2012, is conducting surveys of the benthic community to document the impacts of zebra mussels. Dr. Wong is also overseeing graduate student research related to the prevention of mussell colonization in water supply infrastructure.
Download a hydrographic map of Otsego Lake
Otsego Lake Contour Map with 10' Contours (MS Word)
Otsego Lake Contour Map with 10' Contours (pdf)
Otsego Lake Contour Map with 25' Contours (jpg)
Otsego Lake Contour Map with 25' Contours (MS Word)
This image is based on data from USGS digital elevation models of Otsego Lake and the Cooperstown region.