Northeast Oregon streams and rivers have been running high, but there has been no reported serious damage. A flood warning remained in effect through mid-month for the Imnaha River in Wallowa County because of warm temperatures melting the deep snow pack. Thunderstorm-related precipitation late in the month also helped to maintain the higher river levels. The Grande Ronde River also experienced minor flood conditions during the month. Wet-season snowpack accumulation and precipitation are still expected to provide ample streamflows this summer in all basins.
Most basins are still in the moderately moist category.
The Harney and Umatilla basins have the lowest values in the interior and they are in the slightly moist category. Coastal areas are also in the slightly moist category. May temperatures were well above average statewide. Monthly temperatures were generally four to six degrees above average. This was the 2nd warmest May on record at Portland.