Skunk River gravels near Mount Pleasant: Agate Rockhounding in Henry County, Iowa

Updated June 2026

Skunk River gravels near Mount Pleasant is a mapped rockhounding spot in Henry County, Iowa. Reported finds include agate. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Henry County
State: Iowa
Nearest road: Oakland Mills Road
Postcode: 52641
Coordinates: 40.94735, -91.57190

Geology at Skunk River gravels near Mount Pleasant

This spot sits on ground mapped as Augusta Group that formed roughly 355 to 330 million years ago. Tough silica like agate and jasper typically survives weathering and collects as float in drainages and gravel.

Mapped unit: Augusta Group
Age: 355–330 Ma (Mississippian)
Elevation: 610 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 Skunk River gravels near Mount Pleasant

Best months: March to November. Typical highs run 85°F in midsummer and 32°F in midwinter, with winter lows near 13°F.

Climate normals: NOAA 1991-2020 monthlies, MT PLEASANT 1 SW station (1 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 Skunk River gravels near Mount Pleasant

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

Agate Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Skunk River gravels near Mount Pleasant.

Across the state line from Skunk River gravels near Mount Pleasant

Skunk River gravels near Mount Pleasant is close enough to the Iowa border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Skunk River gravels near Mount Pleasant FAQ

Where is Skunk River gravels near Mount Pleasant?+

Skunk River gravels near Mount Pleasant is in Henry County, Iowa, at 40.94735, -91.57190. Nearest road: Oakland Mills Road.

What rocks and minerals can you find at Skunk River gravels near Mount Pleasant?+

Skunk River gravels near Mount Pleasant is reported to produce Agate.

Is collecting allowed at Skunk River gravels near Mount Pleasant?+

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 Skunk River gravels near Mount Pleasant?+

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 Skunk River gravels near Mount Pleasant?+

The most comfortable months at Skunk River gravels near Mount Pleasant are March to November.

How do I get to Skunk River gravels near Mount Pleasant?+

Open the directions link to navigate to 40.94735, -91.57190 in Google Maps. The nearest road is Oakland Mills Road.

More rockhounding in Iowa

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Open Skunk River gravels near Mount Pleasant on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.