• 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: Thunder Knob

Monitoring team on Thunder Knob. Image Credit: NPS/NOCA
Monitoring team on Thunder Knob.
NPS/NOCA
 

June 2010
Located near a popular day hiking trail, this site was a mix of front country and backcountry. The highway is just a mile below, and vehicle traffic is frequently audible. However, this site is not without natural sounds as well. The sound of a nighthawk performing his dive was audible here.

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

 
 
 
 

Did You Know?

Cascading stream

The North Cascades are well known for the abundant waterfalls that lace the mountains. Two of the best known waterfalls are Gorge Falls between Newhalem and Diablo along State Route 20 and Rainbow Falls in the Stehekin Valley.