Portland, OR—The National Weather Service has extended flash flood watches for portions of the Cascade foothills, including portions of the following counties, Clackamas, Hood River, Lane, Linn, and Marion, through Friday, September 18, late evening.
Heavy rain can trigger landslides, rock fall, and debris flows in steep terrain, and the risk is higher in burn areas.
Find the latest information here: https://alerts.weather.gov/cap/or.php?x=1
Debris flows are rapidly moving, extremely destructive landslides. They can contain boulders and logs transported in a fast-moving soil and water slurry down steep hillsides and through narrow canyons. They can easily travel a mile or more. A debris flow moves faster than a person can run. People, structures and roads located below steep slopes in canyons and near the mouths of canyons may be at serious risk.
If your home, work, or route is in a watch area:
For more landslide and debris flow information: https://www.oregongeology.org/Landslide/debrisflow.htm and Debris-Flow Hazards in the United States, https://pubs.usgs.gov/fs/fs-176-97/fs-176-97.pdf
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