• View from Sourdough Mountain Overlook  A view looking down onto Diablo Lake. Photo Credit: NPS/Michael Silverman, 2010.

    North Cascades

    National Park Washington

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  • Ross Dam Haul Road Repair (2014)

    A short segment of the Ross Dam Haul Road between the Diablo Lake trail suspension bridge and the tunnel remains closed to public use due to ongoing repair and rehab work on a portion originally damaged during a March 2010 landslide. More »

  • Notice of Planned Work - Cascade River Road (Fall 2014)

    The Cascade River Road will be closed from September 8 until late October 2014 to all public use (including foot, bicycle, and vehicle traffic) at the Eldorado gate (3 miles from road's terminus) in order to perform permanent road and culvert repairs. More »

Acoustic Monitoring Site: Sourdough Mountain

Sourdough Trail enshrouded in fog. Image Credit: NPS/NOCA/Basil Tsimoyianis
Sourdough Trail enshrouded in fog.
NPS/NOCA/Basil Tsimoyianis
 

July 2010
High above the highway, a grueling hike rewards visitors with breathtaking views of the highway corridor and the surrounding peaks. The site was located about a mile below the lookout tower, yet sounds of the highway were still audible. A thunderstorm roared through this site and echoed off the peaks and valleys.

Click each title to hear a sound recording. Click on "Sound Clips" in the navigation to return to the map.

 
 
 
 
 

Did You Know?

Long horned beetle

There are more insects in the Park than any other group of animals; in fact, 95% of all animal species on earth are insects. Take your time to explore the breathtaking world of butterflies, beetles, and bugs. More...