Delaware Park: Rockhounding in Sanilac County, Michigan

Updated August 2026

Delaware Park is a mapped rockhounding spot in Sanilac County, Michigan. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Check locally
County: Sanilac County
State: Michigan
Coordinates: 43.61494, -82.59815

Geology at Delaware Park

This spot sits on Coldwater Shale, mapped as shale that formed roughly 360 to 325 million years ago. Sedimentary rock like this erodes unevenly, so the most productive collecting is typically along fresh cuts, badland slopes, and active drainages.

Mapped unit: Coldwater Shale
Age: 360–325 Ma (Mississippian)
Rock types: shale
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 Delaware Park

Best months: April to November. Typical highs run 77°F in midsummer and 29°F in midwinter, with winter lows near 16°F.

Climate normals: NOAA 1991-2020 monthlies, HARBOR BEACH 1 SSE station (15 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

Nearby rockhounding spots

Other rockhounding spots within driving distance of Delaware Park.

Delaware Park FAQ

Where is Delaware Park?+

Delaware Park is in Sanilac County, Michigan, at 43.61494, -82.59815.

What rocks and minerals can you find at Delaware Park?+

Delaware Park is on the rockhounding map but no minerals are listed in our reference. Open RockHoundR to see what other rockhounds have logged.

Is collecting allowed at Delaware Park?+

Confirm rules before collecting. Land status here is not confirmed. Verify with the managing agency before collecting — federal, state, and tribal rules differ. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Delaware Park?+

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 Delaware Park?+

The most comfortable months at Delaware Park are April to November.

How do I get to Delaware Park?+

Open the directions link to navigate to 43.61494, -82.59815 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in Michigan

See all 107 Michigan spots →

Open Delaware Park on the map

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