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PORTLAND Rising rivers have become danger zones as debris starts to build up following the latest storm surge.

Emergency crews were warning boaters to stay out of rivers and streams moving especially fast due to rainfall and snowmelt.

In the Willamette River, tree limbs and logs have started to collect along docks, but even more concerning was all the debris just under the surface of the water.

You know, we see it every winter, but the last time we've seen this much debris coming down was 1996, said Paul Corah with Portland Fire & Rescue.

KGW took a tour with emergency crews on the David Campbell Fire Boat Monday. Firefighters even pointed out a huge dock that had broken free in flooded waters.

Crews have been trying to clear the debris from bridges and other structures, but more just keeps coming.

It becomes a navigational hazard because that debris kind of gets out into the river and tugboats can't see it, especially logs, if they get pushed under the water. A tugboat can hit it and put a hole in the side of the tugboat.

The heavy rain and runoff also created a great deal of turbidity in the Bull Run watershed. As a result, the Portland Water Bureau had to turn off that water supply and switch to a backup.

More: Debris forces Portland water supply switch

The Willamette River has risen much higher than normal for this time of year in Oregon City, transformed Willamette Falls into a murky mess.

(KGWreporter Kyle Iboshi contributed to this report.)

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