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South Umpqua River Gravel Bars: Agate & Jasper Rockhounding in Douglas County, Oregon

Check locally6 mineralsDouglas County, OregonUpdated August 2026
Minerals reported
6
Elevation
850 ft
Best months
Year-round

South Umpqua River Gravel Bars is a mapped rockhounding spot in Douglas County, Oregon. Reported finds include agate, jasper, carnelian, quartz, schist, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Plan your visit

Confirm rules before collecting

State
Oregon
Nearest road
Tiller Trail Highway
Get directionsView on Google Maps

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

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.

Best time to visit South Umpqua River Gravel Bars

Comfortable months (45 to 90°F highs)

Conditions here are workable year-round, with typical highs from 52°F in winter to 88°F in summer.

Climate normals: NOAA 1991-2020 monthlies, RIDDLE station (13 mi away), adjusted for elevation.

Geology at South Umpqua River Gravel Bars

This spot sits on Western Klamath Terrane; Rogue Valley Subterrane, mapped as greenstone that formed roughly 200 to 145 million years ago. Metamorphic rock like this weathers into resistant float, and minerals that survive transport typically concentrate in nearby drainages.

Mapped unit
Western Klamath Terrane; Rogue Valley Subterrane
Age
200–145 Ma (Jurassic)
Rock types
greenstone
Elevation
850 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.

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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:

Found at South Umpqua River Gravel Bars

Each name 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 South Umpqua River Gravel Bars.

Across the state line from South Umpqua River Gravel Bars

South Umpqua River Gravel Bars 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.

South Umpqua River Gravel Bars FAQ

Where is South Umpqua River Gravel Bars?+
South Umpqua River Gravel Bars is in Douglas County, Oregon, at 42.93941, -123.10886. Nearest road: Tiller Trail Highway.
What rocks and minerals can you find at South Umpqua River Gravel Bars?+
South Umpqua River Gravel Bars is reported to produce Agate, Jasper, Carnelian, Quartz, Schist, Petrified Wood.
Is collecting allowed at South Umpqua River Gravel Bars?+
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 South Umpqua River Gravel Bars?+
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 South Umpqua River Gravel Bars?+
South Umpqua River Gravel Bars is workable year-round.
How do I get to South Umpqua River Gravel Bars?+
Open the directions link to navigate to 42.93941, -123.10886 in Google Maps. The nearest road is Tiller Trail Highway.

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