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The Hidden River
in Oregon Historical Markers
Sign along the interpretive trail to Natural Bridge.
posted by: Volcanoguy
location: Oregon
date approved: 11/24/2009
last visited: 05/06/2023
Out of the Rock
The Cave
How Was the Natural Bridge Formed?
Sign in the interpretive kiosk at trailhead to Natural Bridge.
Lava Tubes
Sign along the interpretive trail at the Rogue River Gorge Viewpoint.
last visited: 03/31/2007
Shaping the Gorge
One of three signs at the Rogue River Gorge Viewpoint trailhead interpretive kiosk.
last visited: 08/28/2009
The Upper Rogue River ... Visits Through Time
Mt. Thielsen
Geologic history sign at the Mt. Thielsen Viewpoint on Ore. Hwy. 230.
date approved: 11/23/2009
When the “Dust” Settled...
One of two geologic history sign at the Crater Rim Viewpoint on Ore. Hwy. 230.
One Violent Moment
Mt. Bailey
The Pinnacles
Geologic history sign at The Pinnacles Overlook.
date approved: 11/11/2009
last visited: 12/12/2011
Phantom Ship
Geologic history sign at the Phantom Ship Overlook.
date approved: 11/10/2009
last visited: 07/13/2013
Pumice Castle
Geologic history sign about the Pumice Castle.
last visited: 07/27/2021
Mount Scott
Geologic history sign about Mount Scott.
last visited: 11/27/2020
The Lake in Legend
History sign at Skell Head about “The Lake in Legend”.
Pumice Desert
Geologic history sign at the Pumice Desert Viewpoint along the North Entrance Road.
date approved: 11/07/2009
Glacial Valleys
Geologic history sign at Glacial Valleys Viewpoint on West Rim Drive.
After The Collapse
Geologic history sign at Wizard Island Overlook on West Rim Drive.
date approved: 11/06/2009
Before The Collapse
Cascade Volcanoes
Geologic history sign on Wet Rim Drive about Cascade Volcanoes visible to the south.
Discovery Point
History sign on West Rim Drive about the discovery of Crater Lake.
date approved: 11/05/2009
Mt. Mazama (2)
One of two identical geologic history signs about Mt. Mazama in the Rim Village area at Crater Lake N.P.
Mt. Mazama (1)
Fossil Fumaroles
Geologic history sign about the formation of fossil fumaroles along Annie Creek.
date approved: 11/04/2009