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  • Corps of Engineers seeks public comments on McMillan Island dredged material placement

    The U.S. Army Corps of Engineers, St. Paul District, is seeking comments on a draft Environmental Assessment, or EA, for the placement of dredged material, or river sand, that occurred in 2019 within the Mississippi River in Clayton County, Iowa.

  • Construction to start at Locks and Dams 6 and 10

    The U.S. Army Corps of Engineers, St. Paul District, will begin construction in early June on Lock and Dam 6 in Trempealeau, Wisconsin, and Lock and Dam 10 in Guttenberg, Iowa, to enhance the auxiliary chambers of each structure.

  • Low-Sill Control Structure Gate Load Study

    Abstract: The effort performed here describes the process to determine the gate lifting loads at the Low-Sill Control Structure. To measure the gate loads, a 1:55 Froude-scaled model of the Low-Sill Control Structure was tested. Load cells were placed on 3 of the 11 gates. Tests evaluated the gate loads for various hydraulic heads across the structure. A total of 109 tests were conducted for 14 flows with each flow having two gate settings provided by the United States Army Corps of Engineers, New Orleans District. The load data illustrated the potential for higher gate lifting loads (GLL) to occur at the mid-range gate opening (Go) for Gates 3 and 6. While for Gate 10, the highest GLL (452 kips, maximum load in testing) was at a Go = 4.2 ft. Conversely, for the low-flow bays, the highest load occurred at Go = 24.86 ft.

  • Completed Below Island 9 Project to benefit navigation industry, public

    Congratulations to the Memphis District Below Island 9 Project Delivery Team for achieving total project completion on May 6, 2022. The project area, located in Lake County, Tennessee, was identified as a low water problem spot by local partners in the navigation industry. This area has been dredged by the Memphis District’s Dredge Hurley in 2020 and 2021, yet the problem spot persisted. To come up with a long term solve, a project delivery team came together to complete a dike construction project.

  • Corps seeks public comments on Upper Pool 4 island project modifications

    The U.S. Army Corps of Engineers, St. Paul District, is seeking public comments on its draft Supplemental Environmental Assessment, or supplemental EA, released today, May 11, for proposed modifications to the Pierce County Islands in Upper Pool 4 of the Mississippi River.

  • Corps of Engineers seeks public comments on Lock and Dam 4 project

    The U.S. Army Corps of Engineers, St. Paul District, released a draft Environmental Assessment, or EA, for a proposed end cell project at Lock and Dam 4, near Alma, Wisconsin, today, May 9, and is seeking public comments. Comments should be submitted no later than Jun 9.

  • Upper Mississippi River System Hydraulic Model Update Complete

    The U.S. Army Corps of Engineers, Rock Island, St. Paul and St. Louis Districts recently completed a seven-year effort to develop an updated, standardized hydraulic model for the Upper Mississippi River System, including the Illinois Waterway. The model can be used to evaluate and communicate the effects of floodplain modifications to provide better predictability and more consistent flood risk management for the Upper Mississippi River System.

  • Waterborne Geophysical Investigation to Assess Condition of Grouted Foundation: Old River Control Complex – Low Sill Structure, Concordia Parish, Louisiana

    Abstract: The Old River Low Sill Structure (ORLSS) at the Old River Control Complex (ORCC) in Concordia Parish, LA, is a steel pile-founded, gated reinforced-concrete structure that regulates the flow of water into the Atchafalaya River to prevent an avulsion between the Mississippi River and the Atchafalaya River. A scour hole that formed on the southeast wall of ORLSS during the Mississippi River flood of 1973 was remediated with riprap placement and varied mixtures of self-leveling, highly pumpable grout. Non-invasive waterborne geophysical surveys were used to evaluate the distribution and condition of the grout within the remediated scour area. Highly conductive areas were identified from the surveys that were interpreted to consist mostly of grout. Resistive responses, likely representing mostly riprap and/or sediment, were encountered near the remediated scour area periphery. A complex mixture of materials in the remediated scour area is interpreted by the more gradual transitions in the geophysical response. Survey measurements immediately beneath ORLSS were impeded by the abundance of steel along with the structure itself. The survey results and interpretation provide a better understanding of the subsurface properties of ORLSS.

  • Corps of Engineers plans dredging activities near Winona, Minnesota

    The U.S. Army Corps of Engineers, St. Paul District, is set to dredge the Mississippi River near Winona, Minnesota, this week.

  • FREE Boating Safety Classes to be Offered

    The U.S. Army Corps of Engineers, Rock Island District, will be offering two, free boating safety education classes, May 7 and 14 at the Mississippi River Project Office near Locks and Dam 14 in Pleasant Valley, Iowa. Each class runs from 8 a.m.-4:30 p.m. and is open to anyone 12 years of age or older. Completion of only one of these classes is needed for certification.