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  • PUBLICATION NOTICE: Spatial Analysis of Precipitation and Snow Water Equivalent Extremes for the Columbia River Basin

    Abstract: Recent advances in the spatial statistics of extremes and model calibration were applied to develop and deliver areal-exceedance estimates for precipitation (PREC), by season and duration, and snow water equivalent (SWE), by cool season month and for the water year, for 758 delineated sub-basins of the Columbia River Basin (CRB), which correspond to a new CRB hydrology model watershed delineation. Understanding that future US Army Corps of Engineers, Northwestern Division, mission requirements may change, project execution also included the development and delivery of an application guidance document to credibly compute areal-exceedance estimates, including uncertainty, for PREC or SWE for any arbitrary area within the CRB. R, a free software environment for statistical computing and graphics (https://www.r-project.org/), and QGIS, a free and open source geographic information system (https://qgis.org/en/site/index.html), were the primary tools used for product development and delivery. The following R software packages were primarily used during project execution: evd, Glmnet, maps, raster, rgdal, SDMTools, sp, and SpatialExtremes.

  • Partnering on Lower Missouri River flood risk management solutions

    The historic nature of the 2019 flood, in addition to severe flooding that has occurred over the past decade, served as a catalyst for the governors of Nebraska, Iowa, Kansas and Missouri to come together to discuss solutions for improving the resiliency of the lower Missouri River Basin.

  • Missouri River basin’s below-normal precipitation leads to lower runoff forecast; reduced Gavins Point releases

    Gavins Point releases will be reduced to 33,000 cubic feet per second (cfs) on Friday, May 8 following a reduction in forecast 2020 upper basin runoff. Since January, precipitation in the upper basin has been well below normal, which has led to a reduction in the runoff forecast. Some areas of the Dakotas received less than half of their normal precipitation during the first four months of 2020.

  • Forecast runoff for upper Missouri River basin lower after warm spring

    Gavins Point releases are forecast to remain near 35,000 cubic feet per second through the month of April. The upper Missouri River basin March runoff fell in line with the March 1 forecast. Runoff above Sioux City, Iowa was 5.5 million acre feet, which is almost two times average. The above average runoff was primarily due to plains snow melting over heavily saturated soils. “The warmer-than-normal temperatures melted most of the plains snow in the eastern and central Dakotas. Along with the steady, but near average, rate of snow accumulation in the mountains, the projected upper Missouri River basin runoff for 2020 has been slightly reduced,” said John Remus, chief of the U.S. Army Corps of Engineers’ (Corps) Missouri River Basin Water Management Division.

  • Water managers passing Harvey runoff through Cheatham, Barkley pools

    NASHVILLE, TENN. (Sept. 1, 2017) – The U.S. Army Corps of Engineers Nashville District Water Management Center is working this morning to manage runoff from last night’s heavy rainfall from remnants of Hurricane Harvey down the Cumberland River through Cheatham Dam in Ashland City, Tenn., and Barkley Dam in Grand Rivers, Ky.

  • NR 17-028: Water managers passing Harvey runoff through Cheatham, Barkley pools

    NASHVILLE, TENN. (Sept. 1, 2017) – The U.S. Army Corps of Engineers Nashville District Water Management Center is working this morning to manage runoff from last night’s heavy rainfall from remnants of Hurricane Harvey down the Cumberland River through Cheatham Dam in Ashland City, Tenn., and Barkley Dam in Grand Rivers, Ky.

  • Good snowpack doesn’t ensure good water levels

    This past winter, Oregon received plenty of precipitation and snowpack was more than 170 percent of its average in some areas, according to the National Resources Conservation Service. Many people may believe this is cause for celebration in a state that has seen drought conditions during much of the past few years. And although it is good news, snowpack doesn’t mean Portland District’s reservoirs will be full throughout the summer.

  • Corps reports above normal May runoff in the Missouri River Basin; drought conditions improve in upper basin

    The U.S. Army Corps of Engineers Missouri River Basin Water Management Division reports May runoff in the Missouri River Basin above Sioux City, Iowa, was 3.7 million acre feet (MAF), 110 percent of normal. The 2015 runoff forecast has increased to 22.5 MAF, 89 percent of normal. Average annual runoff is 25.2 MAF.

  • Corps decreases runoff forecast due to lower than normal mountain snowpack

    The U.S. Army Corps of Engineers Missouri River Basin Water Management Division is decreasing the annual runoff forecast for the Missouri River Basin above Sioux City, Iowa, to 20.3 million acre feet (MAF), which is 80 percent of normal and 4.9 MAF less than average. The decreased forecast is due to below normal mountain snowpack and the lack of plains snow in the basin.

  • February runoff higher, but 2015 Missouri River forecast still slightly below normal

    The U.S. Army Corps of Engineers Missouri River Basin Water Management Division reports runoff in the Missouri River Basin above Sioux City, Iowa was 2 million acre feet (MAF) during February, 186 percent of normal. The increased runoff was caused by above normal temperatures in the upper Missouri Basin that limited river ice build-up, and melted both plains and low elevation mountain snows. However, the 2015 runoff forecast in the same reach is 24.6 MAF, 97 percent of normal, and the March runoff forecast is about 1 MAF less than in February.