South Umpqua Bridge: Quartz & Agate Rockhounding in Douglas County, Oregon

Updated August 2026

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

Quick details

Access: Check locally
County: Douglas County
State: Oregon
Nearest road: Tiller Trail Highway
Postcode: 97417
Coordinates: 42.97318, -123.17088

Geology at South Umpqua Bridge

This spot sits on surficial deposits; Terrace deposits, mapped as terrace gravel 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; Terrace deposits
Age: 3 Ma to present (Pleistocene)
Rock types: terrace gravel
Elevation: 790 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 South Umpqua Bridge

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 (10 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

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 South Umpqua Bridge

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 South Umpqua Bridge.

Across the state line from South Umpqua Bridge

South Umpqua Bridge 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 Bridge FAQ

Where is South Umpqua Bridge?+

South Umpqua Bridge is in Douglas County, Oregon, at 42.97318, -123.17088. Nearest road: Tiller Trail Highway.

What rocks and minerals can you find at South Umpqua Bridge?+

South Umpqua Bridge is reported to produce Quartz, Agate, Jasper, Pyrite, Schist.

Is collecting allowed at South Umpqua Bridge?+

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 Bridge?+

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 South Umpqua Bridge?+

South Umpqua Bridge is workable year-round.

How do I get to South Umpqua Bridge?+

Open the directions link to navigate to 42.97318, -123.17088 in Google Maps. The nearest road is Tiller Trail Highway.

More rockhounding in Oregon

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Open South Umpqua Bridge on the map

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