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Eddyville: Agate & Chalcedony Rockhounding in Lyon County, Kentucky

Public accessBest spot3 mineralsLyon County, KentuckyUpdated July 2026
Minerals reported
3
Elevation
390 ft
Best months
September to June

Lyon County, set between Lake Barkley and Kentucky Lake on the lower Cumberland River, is known for agate, chalcedony and jasper that collect in gravels and along the reservoir shorelines. The hard silica pebbles here are reworked from older Continental gravels, a different source than the geodes of central Kentucky. Eddyville sits between the two lakes, with river and shoreline access to the material. Reported finds include agate, chalcedony, jasper. Below: coordinates, access notes, nearby spots, and trip-planning links.

Plan your visit

Generally open to casual rockhounding

Nearest road
Port Authority Road
Postcode
42038
Get directionsView on Google Maps

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

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.

Access note: Shoreline and gravel-bar collecting is possible along the public Cumberland River and the TVA-managed lakes. Surface-collect small amounts and confirm current TVA and Land Between the Lakes rules before collecting. Avoid marina and private-lot frontage, and do not dig developed shoreline.

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.

Best time to visit Eddyville

Comfortable months (45 to 90°F highs)

Best months: September to June. Typical highs run 91°F in midsummer and 48°F in midwinter, with winter lows near 30°F.

Climate normals: NOAA 1991-2020 monthlies, EDDYVILLE 5S station (2 mi away).

Geology at Eddyville

This spot sits on Alluvium, mapped as clay | silt | some sand | gravel that formed within roughly the last 3 million years. Gravels like these concentrate whatever survives the river: agate, jasper, and other tough silica typically show up as rounded, waxy stones.

Mapped unit
Alluvium
Age
3 Ma to present (Quaternary)
Rock types
clay | silt | some sand | gravel
Elevation
390 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.

Today's weather

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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.

Found at Eddyville

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

Nearby rockhounding spots

Other rockhounding spots within driving distance of Eddyville.

Across the state line from Eddyville

Eddyville is close enough to the Kentucky border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Eddyville FAQ

Where is Eddyville?+
Eddyville is in Lyon County, Kentucky, at 37.07251, -88.05743. Nearest road: Port Authority Road.
What rocks and minerals can you find at Eddyville?+
Eddyville is reported to produce Agate, Chalcedony, Jasper.
Is collecting allowed at Eddyville?+
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 Eddyville?+
Most agate and jasper is surface float: bring a spray bottle, a pick or small shovel, and a sturdy bag. Wet stones show their banding and translucence.
When is the best time to visit Eddyville?+
The most comfortable months at Eddyville are September to June.
How do I get to Eddyville?+
Open the directions link to navigate to 37.07251, -88.05743 in Google Maps. The nearest road is Port Authority Road.

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