


Lake Mohansic
A planned 6,000-patient asylum was blocked here in 1918; the lake became parkland instead.
- 6 ft · first step
- 12 ft
- 18 ft
- 24 ft
- 30 ft
- 36 ft · bottom
About Lake Mohansic
In 1909 the New York State Commission in Lunacy paid $135,000 for 550 acres around Lake Mohansic, planning an asylum for as many as 6,000 patients. Senator Robert F. Wagner and others objected that the facility's sewage would threaten the nearby Croton reservoir system, which supplies New York City's drinking water. Governor Charles S. Whitman halted construction, and in 1918 the state legislature abandoned the hospital and created the Mohansic Lake Reservation instead, open to the public rather than fenced off as a hospital campus.
The reservation became a park in 1922 on the former hospital land, and today includes both Mohansic Lake and the adjoining Crom Pond. It sits in the town of Yorktown Heights in Westchester County, about 40 miles north of Manhattan, along the corridor the Taconic State Parkway follows through the county. New York renamed the grounds Franklin D. Roosevelt State Park in 1982. The lake draws anglers, families in canoes and rowboats, and golfers on the public course the park added within its boundaries.
- 4 roads engraved around the shore, 1 of them labeled
- 6 depth layers, each step engraved with its depth in feet
- Compass rose, title block with coordinates, max depth and area; keyhole hanger on the back
Turn it in your hands
Live 3D of the actual cut files — drag to orbit, pinch to zoom. Every road you see is engraved on the real thing.
Viewer not showing? Open it full screen.
Lake Mohansic depth chart, in wood
This is a Lake Mohansic depth chart you can hang: 6 stacked layers of birch, each one a depth contour — 6 ft, 12 ft, 18 ft, 24 ft, 30 ft and deeper, down to the deepest hole at about 36 ft. The lake covers about 0.1 square miles, and 4 shore roads are engraved around it. The shape of the bottom is the real one from published soundings, so anglers recognise their drop-offs and points.
A Lake Mohansic map for the wall — or a gift
Most of these go to a cabin wall, a lake house entry, or a home office; a lot are gifts — the family that has been on Lake Mohansic for three generations, the retirement move, the first boat. The 12-inch is the desk-and-shelf size; the 24- and 30-inch boards read across a room. Add a line under the title and star your place on the shore, and it becomes the map of your Lake Mohansic.
Lake Mohansic map — the details
How big is the map?
Four sizes: 12, 17, 24 and 30 inches on the long side, from $149. Every size is cut from the same depth data of Lake Mohansic; the bigger boards carry more shoreline roads and place names.
Is it made from real depth data?
Yes. Lake Mohansic is cut layer by layer from published bathymetric soundings — each layer of birch is a depth contour, so the shape of the bottom is the real one, not decorative.
Can I add my own place on it?
Yes. At checkout you can add a line under the title (a family name, a cabin name, a year) and star the spot on the shore that matters to you.
How long does it take?
Made to order in Waterford, Pennsylvania and shipped in 7–10 days; shipping is free in the lower 48.
Can you make a lake that isn't listed?
Any lake in the United States — we hold depth data for 104,419 of them. Search for yours; if it isn't built yet we build it when you order.
- 6 depth layers down to 36 ft
- 0.1 square miles of water
- 4 shore roads engraved, 1 named
- Title block, compass rose and depth markers
- Birch plywood, keyhole hanger, made in Waterford, PA



