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  • Corps of Engineers awards $22.5 million for Lock and Dam 5 gate maintenance

    The U.S. Army Corps of Engineers, St. Paul District, awarded a $22.5 million contract to Abhe & Svoboda, Inc., of Jordan, Minnesota, on Sept. 18, for gate maintenance on Lock and Dam 5 located near Minnesota City, Minnesota, on the Mississippi River.

  • NAVIGATION NOTICE: SWL 23-56 - McClellan-Kerr Arkansas River Navigation System

    Mariners are advised that crews will be placing rip rap around the Van Buren Railroad Bridge (NM 300.8).  Work will be performed daily from 6 a.m. to 6 p.m., September 25 through October 4, 2023.  Mariners may contact the onsite workboat, M/V Pine Bluff, on VHF-FM channel 16 or 78 or by phone at (318) 452-5448.  Mariners are advised to transit the area with caution.

  • Navigation Notice: SWL 23-55 McClellan-Kerr Arkansas River Navigation System

    Due to shoaling, mariners are advised that until further notice, both upbound and downbound tows should favor the short wall in the downstream approach at Montgomery Point Lock and Dam (NM 0.5). Also, a 70-ft width restriction is in place to reduce the risk of grounding in the area. Crews are being dispatched to perform digging and clamming operations in the reach. A subsequent navigation notice will be issued once the shoaling has been cleared and the 70-ft width restriction has been lifted.

  • Corps of Engineers hosts open house at Lock and Dam 10

    The U.S. Army Corps of Engineers, St. Paul District, is hosting an open house at Lock and Dam 10, in Guttenberg, Iowa, Saturday, Sept. 23, in conjunction with the 33rd annual GermanFest.

  • Gavins Point winter release slightly above minimum rate

    Rainfall in the Missouri River Basin above Sioux City, Iowa, was above normal for the month of August, resulting in above average runoff. However, due to drier-than-normal conditions in previous years, the total storage in the Missouri River mainstem reservoir system remains lower than normal. Based on the Sept. 1 system storage, winter releases from Gavins Point Dam will be 13,000 cubic feet per second, per the criteria in the Master Manual. This release rate is slightly above the minimum rate of 12,000 cfs.

  • MKARNS Navigation Notice - SWL-23-48

    INCREASED DIFFERENTIALS ON THE WHITE RIVER ENTRANCE CHANNEL

  • U.S. Army Corps of Engineers to begin construction on Vermilion Harbor West Pier

    VERMILION, Ohio — The U.S. Army Corps of Engineers, Buffalo District and its contractor, Norwalk, Ohio-based Mark Schaffer Excavating-Trucking, are scheduled to begin repairs to the Vermilion Harbor West Pier the week of Sept. 4. Construction will temporarily limit access to the Main Street beach while repairs are made, ensuring the harbor remains economically viable and able to provide access for recreation and refuge to boaters on the Great Lakes.

  • The end of a long journey: a history of Lower Granite Lock and Dam

    It was early in the morning and a steam-powered paddleboat made its way up the lower Snake River, trimmed with colored flags. The date was June 19, 1975, and the mood was festive. The vessel was heading for Lower Granite Lock and Dam, whose pool had been raised just four months prior.

  • Cox garners division’s Operations and Maintenance ‘Castle Award’

    NASHVILLE, Tenn. (Aug. 18, 2023) – The U.S. Army Corps of Engineers Great Lakes and Ohio River Division recently recognized a Nashville District work leader as the recipient of its prestigious Operations and Maintenance Castle Award.

  • Unmanned Ground Vehicle (UGV) Path Planning in 2.5D and 3D

    Abstract: Herein, we explored path planning in 2.5D and 3D for unmanned ground vehicle (UGV) applications. For real-time 2.5D navigation, we investigated generating 2.5D occupancy grids using either elevation or traversability to determine path costs. Compared to elevation, traversability, which used a layered approach generated from surface normals, was more robust for the tested environments. A layered approached was also used for 3D path planning. While it was possible to use the 3D approach in real time, the time required to generate 3D meshes meant that the only way to effectively path plan was to use a preexisting point cloud environment. As a result, we explored generating 3D meshes from a variety of sources, including handheld sensors, UGVs, UAVs, and aerial lidar.