Hydrologic Outlook
None

ESFSEW Another moderately strong atmospheric river will impact western Washington starting as early as Saturday night and extending into Wednesday. Rain, heavy at times, is likely. The snow level will be 5000 feet rising to 8000 ft during the heaviest rainfall on Monday before dropping to 3000 to 4000 feet Monday night into Tuesday. In addition, soils will still be nearly saturated and rivers elevated or still above flood stage. Expect rising rivers with the potential for flooding. Urban flooding, landslides, and debris flows are also possible throughout this period. Please monitor the latest river forecasts from the National Weather Service for additional information.

Colonial Peak Mountain Peaks

Mountain Peaks

Pacific Ranges

Cascade Range

Last Updated: December 12, 2025

Colonial Peak, located in the Pacific Ranges mountain range in Washington State, is a prominent peak that attracts mountaineers and outdoor enthusiasts alike.

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Summary

Standing at an impressive elevation of 7,168 feet (2,185 meters), Colonial Peak offers a challenging and rewarding climbing experience.

During the winter season, the snowpack on Colonial Peak can vary significantly. The mountain receives abundant snowfall, with snowpack depths reaching several meters. This makes it an ideal destination for winter sports enthusiasts, such as backcountry skiers and snowshoers, who can enjoy the pristine snow-covered slopes.

The melting snow on Colonial Peak feeds into several creeks and rivers in the surrounding area. Notable among these is Thunder Creek, which originates from the south side of the mountain. The runoff from Colonial Peak contributes to the flow of Thunder Creek, ultimately joining the Skagit River, a key waterway in the region.

In terms of history and folklore, the name "Colonial" was given to the peak by the US Geological Survey in 1910, possibly inspired by the colonial architecture of nearby Diablo Dam. While no specific legends or lore are associated with Colonial Peak, its challenging terrain and breathtaking views continue to captivate those who venture to its summit.

Sources:
- Washington Trails Association: www.wta.org/go-hiking/hikes/colonial-peak
- SummitPost: www.summitpost.org/colonial-peak/150568

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Hydrologic Outlook
Until 2025-12-13T06:30:00-08:00 • National Weather Service
ESFSEW Another moderately strong atmospheric river will impact western Washington starting as early as Saturday night and extending into Wednesday. Rain, heavy at times, is likely. The snow level will be 5000 feet rising to 8000 ft during the heaviest rainfall on Monday before dropping to 3000 to 4000 feet Monday night into Tuesday. In addition, soils will still be nearly saturated and rivers elevated or still above flood stage. Expect rising rivers with the potential for flooding. Urban flooding, landslides, and debris flows are also possible throughout this period. Please monitor the latest river forecasts from the National Weather Service for additional information.