263 
FGUS76 KPDT 271646
ESFPDT
ORZ508-271700-

Hydrologic Outlook 
National Weather Service Pendleton OR 
944 AM PDT Thu Mar 27 2025

...RISES EXPECTED ON RIVERS AND STREAMS THURSDAY INTO THIS WEEKEND...

Temperatures in the 60s and 70s Wednesday will increase snow melt of 
the mid and high elevation snow pack. This will be followed by 
mountain rain Wednesday through Friday. Saturated mountain soils 
will allow for efficient runoff and will increase water levels on 
mountain rivers, creeks and streams.

The primary concern is the John Day River at Service Creek which is 
forecast to reach minor flood stage Friday morning through Saturday 
morning, peaking Friday afternoon. The Naches River at Cliffdell is 
currently in action stage and is forecast to peak Thursday night 
before slowly declining to below action stage Tuesday evening. The 
Yakima River at Umtanum is also currently in action stage and is 
forecast to peak Thursday evening before dropping below action stage 
Friday evening. The Grande Ronde River at Troy is forecast to reach 
action stage this evening and peak Thursday night into Friday 
morning before dropping below action stage Sunday morning. The 
Naches River near Naches is forecast to reach action stage Thursday 
morning and peaking Thursday night before dropping below action 
stage Saturday morning. The Yakima River at Kiona is forecast to 
reach action stage Friday morning, peaking Saturday morning before 
dropping below action stage Sunday night. Several other rivers are 
forecast to approach but not quite reach action stage. Smaller 
creeks and streams may also have significant rises but at this time 
they do not appear to reach levels that would cause flooding.

People with activities near creeks and streams should exercise 
caution as flows will be swift and very cold water can quickly lead 
to hypothermia if someone were to fall into the water.

Those with interests along rivers, creeks and streams should 
continue to monitor forecasts as there is some uncertainty in the 
expected water levels. Stay tuned to for the latest forecast updates 
along with any flood warnings or advisories that may be issued.

$$