Lost River
Posted by: Groundspeak Regular Member Bernd das Brot Team
N 43° 32.937 W 113° 00.443
12T E 337843 N 4823735
For about 120 miles, a big river simply disappears.
Waymark Code: WMHMA
Location: Idaho, United States
Date Posted: 07/17/2006
Published By:Groundspeak Premium Member muddawber
Views: 77


The end of Lost River
Look at Idaho’s map east of Craters of the Moon National Monument and you will find the Snake River Plains. The plains are there, all right, but no river anywhere. Read the marker to find out what happened.

(Click on the thumnails for larger pictures)

This site is also the location of Marker Nuclear Reactors.


Snake River Plains

Marker Name: Lost River

Marker Type: Roadside

Marker Text:
When its water is not diverted for upstream irrigation, lost river floes past here into a sink 14 miles to the northeast. Lava flows in the Snake River Plains buried old channels of Lost River and Birch Creek. No longer able to reach the Snake on the surface, they went underground. After a 120 mile journey under the lava plains, water from Lost River eventually emerges through numerous large springs below Twin Falls, making up a small part of the flow of Thousand Springs near Hagerman.


County: Butte

Marker Number: 304

City: Not listed

Date Dedicated: Not listed

Group Responsible for Placement: Not listed

Web link(s) for additional information: Not listed

Visit Instructions:
In your log, please say if you learned something new, and if you took any extra time to explore the area once you stopped at the historic marker waymark. If possible please post a photo of you OR your GPS at the marker location. Also if you know of any additional links not already mentioned about this bit of Idaho history please include that in your log.

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Recent Visits/Logs:
Date Logged Log User Rating  
The A-Team visited Lost River 06/12/2024 The A-Team visited it
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Markerman62 visited Lost River 05/30/2008 Markerman62 visited it
Bernd das Brot Team visited Lost River 07/04/2006 Bernd das Brot Team visited it
harrisonha visited Lost River 12/17/1989 harrisonha visited it

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