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  • USACE increases outflows at Mud Mountain Dam April 1

    U.S. Army Corps of Engineers will increase outflows from Mud Mountain Dam, starting April 1. The operating project has been storing more water than usual to support essential construction work at its fish passage facility located near Enumclaw, Washington.
  • USACE awards Howard A. Hanson Dam fish passage contract

    U.S. Army Corps of Engineers officials awarded the Howard A. Hanson Dam Additional Water Storage Fish Passage Facility Project contract to Flatiron-Aecon Joint Venture on Oct. 16, 2024. The total contract price is $657 million.
  • Advancements in Riverine Fish Movement Modeling: Bridging Environmental Complexity and Fish Behavior

    Abstract: Understanding fish movement and response in relation to their environment near infrastructure and migratory barriers is crucial for developing sustainable fisheries management solutions. Intermediate-scale movement models are a contemporary approach for understanding and predicting movement patterns of riverine fish considering their changing environment, which is predominately water flow. These models can be complex and require interdisciplinary knowledge. For more than 60 years, different approaches have been developed for investigating, reproducing, and predicting the movement outcomes of fish decision making. Due to the breadth of model frameworks available, a systematic review is helpful to summarize the available knowledge including a description of general model properties, environment modeling, agent characteristics, and methods of data use, output, and validation. The analysis of 38 studies found a wide range of model frameworks and architectures. Despite the lack of consistency, each model imposed some combination of the following behaviors: response to flow direction (i.e., rheotaxis), response to flow velocity magnitude, response to turbulence, response to depth, and memory/experience of the individual. There is a clear need for more consistent modeling approaches, increased consideration of memory/experience, inclusion of a wider range of species, incorporation of more detailed environmental covariates, and use of time-dependent solutions in fish movement models.
  • Corps of Engineers celebrates the completion of its Drayton Dam project

    ST. PAUL, Minn. – The U.S. Army Corps of Engineers, St. Paul District, will celebrate the completion of its Drayton Dam Fish Passage Mitigation Project with a dedication ceremony at 1 p.m., Sept. 25, at the site of the dam near Drayton, North Dakota.
  • USACE awards Mill Creek Low Flow Project contract: construction to begin this summer

    WALLA WALLA, Wash. – On May 3, the U.S. Army Corps of Engineers, Walla Walla District awarded a $5.6 million construction contract to Advancia Remediation Services, LLC to improve habitat conditions for endangered salmonids in the Mill Creek channel.
  • 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.
  • USACE Plans Fish Survival Testing this Fall on the Second Improved Fish Passage Turbine

    The U.S. Army Corps of Engineers Walla Walla District has started the installation process in Unit 1 for another adjustable blade turbine designed for improved fish passage. The Corps has been working diligently to decrease fish injury and improve survival rates through turbines designed for improved fish passage at Ice Harbor Lock and Dam.
  • Exploring the USACE Walla Walla District: An Engineering Student’s Journey

    “I’ve always thought that the U.S. Army Corps of Engineers was all about hydropower. I didn’t think there was too much to it.”
  • 43 fish die in Mud Mountain Dam fish passage facility

    Two physical barrier mishaps occurred at the new Mud Mountain Dam fish passage facility June 22 and June 26, which left 42 Chinook salmon and one bull trout dead.
  • Corps awards a $7.7 million contract to construct a fish passage at Drayton Dam

    ST. PAUL, Minn. – The U.S. Army Corps of Engineers, St. Paul District, awarded a $7.7 million contract to HSG Park Joint Venture, LLC, of Harvey, North Dakota, to complete a fish passage structure at Drayton Dam, located around 60 miles north of Grand Forks, North Dakota, on the Red River of the North.