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  • Estuarine Dams and Weirs: Global Analysis and Synthesis

    Abstract: Estuarine dams and weirs are constructed in estuaries for blocking the salt intrusion, securing freshwater, and stabilizing upstream water levels. While they can provide many social benefits, they also alter physical and sedimentary processes. To address this, we perform and extensive remote sensing and literature analysis. Remote sensing was conducted based on a global river database of 1531 rivers representing the largest rivers cumulatively draining 85 % of the landmass discharging into the global ocean. It was found that 9.7 % of global estuaries and deltas are currently affected by estuarine dams or weirs acting as the upstream limit of salt, tide, or storm surge intrusion. Most estuarine dams and weirs are located at x = 0–100 km inland from the mouth and their discharge intervals can be continuous. They are found most in river mouths which are wave-dominated followed by tide-dominated and then river-dominated. They can cause significant changes to the quantity and timing of freshwater discharge, tides, stratification, turbidity, sedimentation, oxygen conditions, phytoplankton blooms, and fish migration. We propose a conceptual model for physical and geomorphological change in mixed wave- and river-dominated and tide-dominated estuaries with estuarine dams.
  • Coalshaft South Temporary Closure

    The Coalshaft South parking lot and boat ramp at Lake Shelbyville will be closed starting the evening of Monday, September 2, 2024, through approximately 5p.m. Thursday, September 5, 2024, for a fish habitat placement project. The closures apply to both vehicle and pedestrian traffic. These closures are necessary to provide safety for workers and members of the public while work is being conducted.
  • Corps urges caution to rec boaters on newly created islands near Grafton

    The U.S. Army Corps of Engineers, St. Louis District’s Dredge Potter is currently working near Grafton, Illinois, between river miles 218 and 222, using a 300-foot-long flexible floating pipeline to removed material from the navigation channel. The flexible pipeline allows for the creation of ephemeral islands that will be used for habitat restoration and mimics natural sand bar formation. Due to rising water levels and since the dredge placement is unconfined using the energy of the river to distribute the sediment and shape the bar, these newly created ephemeral islands or sandbars may be underwater or unstable and it is recommended that boaters avoid these temporary islands.
  • Construction to begin at Mill Creek June 10

    WALLA WALLA, Wash. – The U.S. Army Corps of Engineers, Walla Walla District will begin construction projects at Mill Creek, June 10, to improve habitat conditions for endangered salmonids and improve flood risk management operations, while also replacing the boat ramp for public use at Bennington Lake.
  • Corps, partners to host Upper Pool 4 project groundbreaking ceremony

    The U.S. Army Corps of Engineers, St. Paul District, Wisconsin Department of Natural Resources and the Lake Pepin Legacy Alliance are hosting a groundbreaking ceremony in Bay City, Wisconsin, May 16, to kickoff construction of a first-of-its-kind Mississippi River habit improvement project.
  • USACE Memphis releases Draft Feasibility Report, Environmental Assessment for Hatchie-Loosahatchie Restoration Study, requests public comment

    The U.S. Army Corps of Engineers (USACE), Memphis District (CEMVM) released a Draft Integrated Feasibility Report and Draft Environmental Assessment (DIFR-EA) for the Hatchie-Loosahatchie Mississippi River Ecosystem Restoration Study to the general public, Feb. 10, 2023. The general public, interested parties, and stakeholders are invited to comment on the DIFR-EA.
  • Army Corps to collect Christmas trees at Tionesta Lake

    The U.S. Army Corps of Engineers Pittsburgh District will begin accepting live evergreen Christmas trees at Tionesta Lake, which will be used for aquatic habitat-improvement projects, beginning Dec. 27.
  • USACE Memphis District prepares DIFR-EIS for Hatchie-Loosahatchie Restoration Study

    A Notice of Intent (NOI) was published in the Federal Register on this matter Friday, Nov. 4, 2022. This opened the comment period, which will last until Dec. 5, 2022. 
  • 22-057 Corps invites public comments and schedules public meeting to gather input on Owyhee River Aquatic Ecosystem Restoration Feasibility Study

    OWYHEE, NV – The U.S. Army Corps of Engineers, Walla Walla District, invites your comments regarding the scope of the Owyhee River Aquatic Ecosystem Restoration Feasibility Study. The Corps has also scheduled a public meeting to provide information and accept comments on the study.
  • Mississippi River Commission and Corps of Engineers tour Missouri River

    Leaders from The Mississippi River Commission along with leaders from the U.S. Army Corps of Engineers toured the Missouri River Mar. 29 – Apr. 1. Lt. Gen. Scott A. Spellmon, chief of engineers and commanding general, U.S. Army Corps of Engineers, Brig. Gen. D. Peter Hemlinger, commander, Northwestern Division, Col. William Hannan Jr., commander, Kansas City District and Col. Mark Himes, commander, Omaha District, met with partners and stakeholders and visited sites along the river.