858
NWUS55 KBOI 271910
LSRBOI

Preliminary Local Storm Report
National Weather Service Boise ID
1210 PM MST Thu Feb 27 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1000 AM     Flood            1 ENE Vale              43.99N 117.22W
02/26/2025                   Malheur            OR   NWS Storm Survey

            Personnel from Boise WFO surveyed flooding
            on the Malheur River on Wednesday, February
            26th. The river reached flood stage (19.5
            feet) at Vale (VALO3) on Monday, February
            24th around 9 pm and continued to rise into
            the major flood category reaching a crest of
            23.55 feet around 12:00 pm MST on February
            25th. The crest of 23.55 feet represents a
            stage above the USGS rating curve but
            estimated to be around 11,300 cfs, which is
            the highest flow since 1982. Observed
            impacts found by the NWS flood survey,
            conducted on February 26th, included some
            houses and outbuildings being impacted by
            flood water, especially in the vicinity of
            the 36th street bridge, in Ontario, Oregon.
            Significant flooding of agricultural land
            was observed near the river, extending as
            far as 1/2 a mile from the main channel on
            both sides of the river. There were several
            irrigation canals where water from the river
            breached head gates over filling the canals
            with flood water. At least one breach of the
            Nevada Irrigation canal side levy was
            observed which was causing additional
            agricultural flooding in an area separated
            from the main river flooding near Vale
            Oregon. U.S Highway 20, west of Vale, Oregon
            was inundated with flood water in several
            sections and remains closed as of 10 am,
            February 26th. It appears that the main levy
            protecting the city of Vale, remained intact
            through the flood. Information from the U.S.
            Army Corps of Engineers, indicated that any
            rise of water above 24 feet would have
            exceeded the safe design of the levee, and
            the observed crest of 23.55 feet remained
            below that critical threshold. There have
            not been any reported fatalities or
            injuries. The river has receded from the
            flood crest and fell below flood stage
            around 10 am, February 26th.


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