Oswegatchie River Area: Serpentine Rockhounding in Saint Lawrence County, New York

Updated June 2026

Oswegatchie River Area is a mapped rockhounding spot in Saint Lawrence County, New York. Reported finds include serpentine. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Saint Lawrence County
State: New York
Nearest road: NY 58
Postcode: 13642
Coordinates: 44.33300, -75.49188

Geology at Oswegatchie River Area

This spot sits on Calcitic and dolomitic marble, mapped as marble that formed roughly 1600 to 1000 million years ago. Metamorphic rock like this weathers into resistant float, and minerals that survive transport typically concentrate in nearby drainages.

Mapped unit: Calcitic and dolomitic marble
Age: 1600–1000 Ma (Mesoproterozoic)
Rock types: marble
Elevation: 410 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Best time to visit Oswegatchie River Area

Best months: April to November. Typical highs run 79°F in midsummer and 27°F in midwinter, with winter lows near 5°F.

Climate normals: NOAA 1991-2020 monthlies, GOUVERNEUR 3 NW station (2 mi away).

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Oswegatchie River Area

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Serpentine Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Oswegatchie River Area.

Oswegatchie River Area FAQ

Where is Oswegatchie River Area?+

Oswegatchie River Area is in Saint Lawrence County, New York, at 44.33300, -75.49188. Nearest road: NY 58.

What rocks and minerals can you find at Oswegatchie River Area?+

Oswegatchie River Area is reported to produce Serpentine.

Is collecting allowed at Oswegatchie River Area?+

Generally open to casual rockhounding. Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Oswegatchie River Area?+

A rock hammer, sturdy gloves, safety glasses, and a collecting bag cover the basics here. Add a spray bottle: wet rock shows color and pattern that dry rock hides.

When is the best time to visit Oswegatchie River Area?+

The most comfortable months at Oswegatchie River Area are April to November.

How do I get to Oswegatchie River Area?+

Open the directions link to navigate to 44.33300, -75.49188 in Google Maps. The nearest road is NY 58.

More rockhounding in New York

See all 74 New York spots →

Open Oswegatchie River Area on the map

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