Sturgeon Bay Beach: Rockhounding in Emmet County, Michigan

Quick details

Access

Check locally

County

Emmet County

State

Michigan

Coordinates

45.70267, -84.95309

Geology at Sturgeon Bay Beach

This spot sits on Detroit River Group, mapped as dolostone that formed roughly 395 to 385 million years ago. Carbonate rock like this dissolves and weathers readily, so fresh road cuts, quarries, and creek exposures are typically the most productive ground.

Mapped unit

Detroit River Group

Age

395–385 Ma (Middle Devonian)

Rock types

dolostone

Elevation

590 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 Sturgeon Bay Beach

Best months: April to October. Typical highs run 75°F in midsummer and 27°F in midwinter, with winter lows near 14°F.

Climate normals: NOAA 1991-2020 monthlies, CROSS VILLAGE 1E station (5 mi away).

Land & collecting status

Confirm rules before collecting

Land status here is not confirmed. Verify with the managing agency before collecting — federal, state, and tribal rules differ.

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.

State guidance last verified: April 1, 2026

• Michigan DNR — Rockhounding rules
• Michigan Geological Survey
• Isle Royale National Park — Rules
• Community submissions reviewed against published agency rules