Thomas Creek: Agate & Jasper Rockhounding in Linn County, Oregon

Updated August 2026

Thomas Creek is a mapped rockhounding spot in Linn County, Oregon. Reported finds include agate, jasper, petrified wood. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Check locally
County: Linn County
State: Oregon
Nearest road: Thomas Creek Drive
Coordinates: 44.71236, -122.60931

Geology at Thomas Creek

This spot sits on surficial deposits; Alluvial deposits, mapped as mixed alluvium that formed within roughly the last 3 million years. Petrified wood typically travels as tough float, and worked gravels like these are exactly where weathered pieces tend to collect.

Mapped unit: surficial deposits; Alluvial deposits
Age: 3 Ma to present (Quaternary)
Rock types: mixed alluvium
Elevation: 740 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 Thomas Creek

Best months: January to November. Typical highs run 80°F in midsummer and 46°F in midwinter, with winter lows near 32°F.

Climate normals: NOAA 1991-2020 monthlies, LACOMB 3 NNE station (8 mi away), adjusted for elevation.

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

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 Thomas 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 Thomas Creek.

Across the state line from Thomas Creek

Thomas Creek is close enough to the Oregon border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Thomas Creek FAQ

Where is Thomas Creek?+

Thomas Creek is in Linn County, Oregon, at 44.71236, -122.60931. Nearest road: Thomas Creek Drive.

What rocks and minerals can you find at Thomas Creek?+

Thomas Creek is reported to produce Agate, Jasper, Petrified Wood.

Is collecting allowed at Thomas Creek?+

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 Thomas Creek?+

A rock hammer, sturdy gloves, and a padded bag cover petrified wood hunting. Most pieces are surface float, so walking slopes and washes beats digging.

When is the best time to visit Thomas Creek?+

The most comfortable months at Thomas Creek are January to November.

How do I get to Thomas Creek?+

Open the directions link to navigate to 44.71236, -122.60931 in Google Maps. The nearest road is Thomas Creek Drive.

More rockhounding in Oregon

See all 177 Oregon spots →

Open Thomas Creek on the map

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