• 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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  • Lone Mountain Fire - Trail Closures

    The Lone Mountain Fire in North Cascades National Park is approximately 5 mi NW of Stehekin in the Boulder Creek drainage. Boulder Creek and War Creek Trails are closed. Rainbow Loop Trail is in-use as a staging area and closed to public use. More »

  • USFS closes Easy Pass Trail from State Route 20

    Due to fire activity near the trail, the US Forest Service has closed the Easy Pass trail and trailhead on State Route 20. This area has been receiving precipitation. The highway remains open.

Results

The four charts (Figures 10-13) summarize data collected over the past 18 years for each glacier. The vertical axis is the amount of water gained (winter balance), lost (summer balance), and retained (net balance) in meters of water equivalent (m.w.e.) averaged across the glacier. We use water equivalent as a measure because of the varying density of snow, ice and firn. This system allows us to summarize the melting of all three as one value. The horizontal axis lists the year of measurement on each glacier. Winter balance is always positive, while the summer balance is always negative. The net balance varies depending on whether or not the snowfall from the previous winter exceeded melting the following summer. Melt is greatest at the lowest elevations, often exceeding eight vertical meters. In addition, the data show a tendency for cool summers following wet winters, along with hot summers following dry winters. When these seasonal factors are coupled, the glaciers respond by positive balance and extreme negative balance, respectfully.
 
Figure 10
Figure 10 - Noisy Glacier Mass Balance
 
Figure 11
Figure 11 - Silver Glacer Mass Balance
 
Figure 12
Figure 12 - North Klawatti Glacier Mass Balance
 
Figure 13
Figure 13 - Sandalee Glacier Mass Balance

Did You Know?

Junior Ranger Totem: Raven

Anyone can become a North Cascades Junior Ranger! Pick up one of the four FREE activity booklets at any of the visitor or information centers. Complete the activities and earn your official junior ranger badge! Download the booklet here. More...