Stonefield Beach State Park (Tenmile Creek): Agate & Jasper Rockhounding in Lane County, Oregon

Updated August 2026

Stonefield Beach State Park (Tenmile Creek) is a mapped rockhounding spot in Lane County, Oregon. Reported finds include agate, jasper. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Lane County
State: Oregon
Nearest road: Oregon Coast Highway
Coordinates: 44.22513, -124.11071

Geology at Stonefield Beach State Park (Tenmile Creek)

This spot sits on surficial deposits; Coastal terrace deposits, mapped as terrace colluvium and organic wood fragments fragments 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: surficial deposits; Coastal terrace deposits
Age: 3 Ma to present (Quaternary)
Rock types: terrace colluvium and organic wood fragments fragments
Elevation: 10 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 Stonefield Beach State Park (Tenmile Creek)

Conditions here are workable year-round, with typical highs from 53°F in winter to 64°F in summer.

Climate normals: NOAA 1991-2020 monthlies, YACHATS station (7 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.

State guidance last verified: April 1, 2026

BLM Oregon/Washington — Rockhounding & mineral material
Oregon Department of Geology and Mineral Industries (DOGAMI)
Oregon Parks and Recreation Department — beach collecting rules
Community submissions reviewed against published agency rules

Found at Stonefield Beach State Park (Tenmile Creek)

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 Stonefield Beach State Park (Tenmile Creek).

Stonefield Beach State Park (Tenmile Creek) FAQ

Where is Stonefield Beach State Park (Tenmile Creek)?+

Stonefield Beach State Park (Tenmile Creek) is in Lane County, Oregon, at 44.22513, -124.11071. Nearest road: Oregon Coast Highway.

What rocks and minerals can you find at Stonefield Beach State Park (Tenmile Creek)?+

Stonefield Beach State Park (Tenmile Creek) is reported to produce Agate, Jasper.

Is collecting allowed at Stonefield Beach State Park (Tenmile Creek)?+

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 Stonefield Beach State Park (Tenmile Creek)?+

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 Stonefield Beach State Park (Tenmile Creek)?+

Stonefield Beach State Park (Tenmile Creek) is workable year-round.

How do I get to Stonefield Beach State Park (Tenmile Creek)?+

Open the directions link to navigate to 44.22513, -124.11071 in Google Maps. The nearest road is Oregon Coast Highway.

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Open Stonefield Beach State Park (Tenmile Creek) on the map

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