Lakes / New York / Rio Reservoir

Rio Reservoir, New York

422 acres

Surface Area

80 ft

Max Depth

31 ft

Average Depth

9.3 mi

Shoreline

811 ft

Surface Elevation

Where It Sits, and How Deep It Goes

Locator - New York

41.51 degrees N, 74.76 degrees W - Sullivan County. State and county outlines drawn from Census boundary data; the lake marker is placed by its New York State DEC coordinates, not by eye. Schematic - not a survey map.

Depth Profile - Rio Reservoir

Schematic cross-section drawn to one shared depth scale - not a survey or bathymetric map.

How Rio Reservoir Stacks Up

Its average depth of 31 ft is more than 3 times a typical shallow New York lake, which averages under 10 ft.
About 94 miles from Albany, as the crow flies.
12 fish species on the DEC list for this lake.

Fish Species

WalleyeSmallmouth BassLargemouth BassBlack CrappieBluegillYellow PerchBrown TroutRock BassBullheadChain PickerelRegion 3Yellow Perch And Walleye Regulations Special Fishing Regulations Apply Important Links Rio Reservoir Contour Map Contact For This Page Bureau Of Fisheries

Species recorded for this lake. Presence only - no abundance ratings.

Facts and Figures

Waterbody ID120022970

CountySullivan

Coordinates41.5114, -74.7590

Deepest Natural Lakes in New York

#	Lake	County	Surface Area	Max Depth
1	Seneca Lake	Ontario, Yates, Seneca, Schuyler	43,343 acres	618 ft
2	Cayuga Lake	Cayuga	42,956 acres	435 ft
3	Skaneateles Lake	Onondaga, Cortland, Cayuga	8,960 acres	300 ft
4	Canandaigua Lake	Ontario, Yates	10,558 acres	276 ft
5	Lake George	Essex, Warren	28,451 acres	187 ft

Largest Lakes in New York

#	Lake	County	Surface Area	Max Depth
1	Lake Erie	Erie	6,360,010 acres	-
2	Lake Ontario	Jefferson	4,656,925 acres	-
3	Lake Champlain	Washington	277,117 acres	-
4	Oneida Lake	Oswego	51,324 acres	-
5	Seneca Lake	Ontario, Yates, Seneca, Schuyler	43,343 acres	618 ft

Sources: New York State DEC lake data (ID 120022970); USGS. Verified October 30, 2026.