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Muscatine (agate): Lake Superior Agate & Moss Agate Rockhounding in Louisa County, Iowa

Updated July 2026

The stream gravels around Muscatine and neighboring Louisa County are named by the Iowa Geological Survey as a reliable source of Lake Superior agate, moss agate, chalcedony, and clear quartz. The material is glacial float, carried south from the Superior basin and concentrated where creeks cut through the drift. Muscatine's Mississippi River terraces add a second gravel source close at hand. Reported finds include lake superior agate, moss agate, chalcedony, quartz. Below: coordinates, access notes, nearby spots, and trip-planning links.

Muscatine (agate) photos

Public image records connected to this spot or its reported material.

1 photo

Aerial view of the Mississippi River at Muscatine, Iowa

Quick details

Access: Public area
County: Louisa County
State: Iowa
Nearest road: County Road G44X
Postcode: 52653
Coordinates: 41.31852, -91.15610

Geology at Muscatine (agate)

This spot sits on ground mapped as Cedar Valley Group that formed roughly 390 to 370 million years ago. Tough silica like agate and jasper typically survives weathering and collects as float in drainages and gravel.

Mapped unit: Cedar Valley Group
Age: 390–370 Ma (Middle Devonian to Late Devonian)
Elevation: 530 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 Muscatine (agate)

Best months: March to November. Typical highs run 85°F in midsummer and 31°F in midwinter, with winter lows near 13°F.

Climate normals: NOAA 1991-2020 monthlies, MUSCATINE station (8 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 Muscatine (agate)

Each chip 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 Muscatine (agate).

Across the state line from Muscatine (agate)

Muscatine (agate) 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.

Muscatine (agate) FAQ

Where is Muscatine (agate)?+

Muscatine (agate) is in Louisa County, Iowa, at 41.31852, -91.15610. Nearest road: County Road G44X.

What rocks and minerals can you find at Muscatine (agate)?+

Muscatine (agate) is reported to produce Lake Superior Agate, Moss Agate, Chalcedony, Quartz.

Is collecting allowed at Muscatine (agate)?+

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 Muscatine (agate)?+

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 Muscatine (agate)?+

The most comfortable months at Muscatine (agate) are March to November.

How do I get to Muscatine (agate)?+

Open the directions link to navigate to 41.31852, -91.15610 in Google Maps. The nearest road is County Road G44X.

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