News Stories

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  • April

    Memphis District Hurley: Thawed out and ready to dredge

    During most off seasons, maintaining the Hurley takes a few months and a couple of crews to get everything done. This off-season was a bit different, as unexpected weather posed more obstacles than usual. Much of the south, including Memphis, Tennessee, was hit hard with frigid temperatures in mid-February this year. The last time Memphians experienced weather like this was in 1994.  From frozen pipes to no electricity, many people and structures were impacted by the icy weather, including the district’s Dredge Hurley.
  • May

    Ice Jams Trigger Operation of the Moose Creek Dam on Chena River

    For the first time since operation of the Moose Creek Dam began in 1981, ice jams in the Chena River were the reason that the U.S. Army Corps of Engineers – Alaska District regulated stream flow to successfully prevent flooding of communities in the Fairbanks North Star Borough from April 24 to 30.
  • March

    Fightin’ Ice

    For the past few months, U.S. Army Corps of Engineers Pittsburgh District lock workers on the Allegheny River have been fighting the elements to keep the locks operational as the region endured severe freezing temperatures.

News Releases

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  • PUBLICATION NOTICE: Analysis of Snow Water Equivalent Annual Maxima in the Upper Connecticut River Basin Using a Max-Stable Spatial Process Model

    Abstract: Recent advances from the science of spatial extremes and model regularization were applied to develop areal-based extremes of snow water equivalent (SWE) data for the upper Connecticut River Basin. Development of areal-based SWE exceedance probability estimates are of relevance for cool season probabilistic flood hazard analyses (PFHA). The approach profiled in this case study is applicable for other hydrometeor-ological variables of relevance to PFHA. The methodology conforms with Extreme Value Theory (EVT) for the analysis of spatial extremes; hence, there is a firm theoretical basis for extrapolation. Trend surface development is guided by EVT theory and recent advances for regularizing general linear models. R, a free software environment for statistical computing and graphics, and QGIS, a free and open-source geographic information system, 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. R software packages exist in the public domain and support PFHA analyses of varying complexities. Their application herein is not an endorsement or recommendation. It is recommended that one would need to evaluate any particular R software package regarding its suitability for use for any specific application.

Mississippi Valley Division

Institute for Water Resources

South Pacific Division

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