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The Thunder Knob Trail wanders through the fir forests of the North Cascades on a summer day.
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Colonial and Pyramid Peaks, above Diablo Lake
Colonial Creek is crossed at the start of the Thunder Knob Trail. Colonial Creek's source is Colonial Glacier, high on Colonial Peak.
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Joan Pendleton
Jul 26, 2017 near Diablo, WA
“The Thunder Knob Trail wanders through the fir forests of the North Cascades on a summer day.”  

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The Thunder Knob Trail wanders through the fir forests of the North Cascades on a summer day.
Colonial Creek is crossed at the start of the Thunder Knob Trail. Colonial Creek's source is Colonial Glacier, high on Colonial Peak.
Colonial Peak looking south-southwest from the Thunder Knob Trail
Davis Peak, MacMillan Spires, distant glacier, and nearby shoulder of Sourdough Mountain (left to right) rise above Diablo Lake, looking northwest from Thunder Knob
The rewarding view of Diablo Lake from the top!!!
Diablo Lake below, looking east-northeast from Thunder Knob
Diablo Lake from the Overlook
Colonial and Pyramid Peaks, above Diablo Lake
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Thunder Knob Trail

1.9 mi 3.0 km
 26
Diablo, WA