W912HZ26S0001 ERDC Broad Agency Announcement

A. Background The overall goal of this project is to improve water quality conditions in Willow Creek Reservoir for the benefit of the community of Heppner, Oregon, and surrounding area. The reservoir is characterized by several water quality concerns, including dense cyanobacteria (or blue-green algae) blooms, low dissolved oxygen concentrations, and high nutrient concentrations. Cyanobacteria blooms are known to produce toxins, thereby threatening the aquatic ecosystem and potentially exposing humans and animals to risk of death or chronic illness such as neurodegeneration and liver damage. Each summer, Willow Creek Reservoir post’s health advisories warning users of the potential hazards associated with recreational activities on the lake. Furthermore, fish kills, foul odors and other nuisances are common in Willow Creek Reservoir affecting the community’s ambiance, limiting tourism and recreation on the lake. This analysis draws upon prior research, readily available data, and new research and data to develop and implement an evaluation program for the restoration of Willow Creek Reservoir and its upper basin. Research results will provide public benefit through enhanced water quality in Willow Creek Reservoir producing public recreation opportunities and natural resource benefits. B. Program Description/Objective The primary objective is to advance the scientific understanding of reservoir ecology through the following research pillars: 1. Empirical Data Acquisition and Limnological Analysis: To maintain the integrity of high-resolution, longitudinal datasets, the research involves systematic environmental monitoring and experimental observation. This includes the monthly collection of water samples and the recording of in-situ physicochemical measurements to analyze long-term nutrient cycling patterns and ecosystem shifts. Rather than routine maintenance, site visits are designed to manage the reservoir aeration unit as a controlled experimental variable. This allows researchers to study the mechanical suppression of thermal stratification and quantify its subsequent impact on internal loading and overall water quality. 2. Hydrodynamic Modeling and Predictive Analysis : The project will develop a comprehensive whole-lake hydrodynamic model. This model is a specialized research tool designed for the University to synthesize complex environmental data, simulate various "what-if" scenarios, and forecast the reservoir’s future water quality trajectory. While the insights derived from this model will inform the Portland District’s future best management practices and dam operations, the model itself serves as a transferable scientific tool. Findings derived from this model will be presented in formats accessible to stakeholders and the scientific community to aid in the regional understanding of water quality trajectories. 3. Mitigation Strategy Evaluation : Researchers will evaluate the effectiveness of current systems and model alternative options including but not limited to the installed aeration system and water quality outlet operations. This investigative work is performed to identify the most cost-effective and ecologically sound strategies for protecting the public interest and restoring the reservoir’s health. 4. Knowledge Dissemination: The partnership will facilitate the dissemination of research results through both public and technical forums to ensure that data serves the community as a transparent resource. While the University will provide monthly trip reports and a comprehensive annual report that integrates current findings with historical data to produce a clear, accessible record of reservoir health that will be made available to local stakeholders and the public. These efforts are designed to move beyond internal reporting, instead providing the transparency necessary to safeguard public health, drinking water resources, and recreational safety. Ultimately, this collaborative flow of information ensures that the research directly informs community-led restoration efforts and remains a matter of public record. D. Public Benefit Willow Creek Reservoir (WCR) is considered a eutrophic water body and is characterized by severe cyanobacteria blooms (CyanoHABs) during the summer months. These blooms frequently trigger Oregon Health Authority (OHA) public health advisories, which negatively impact annual tourism and recreation. Furthermore, CyanoHABs contribute to fish kills and contribute to the overall deterioration of water quality and the aesthetic value. In response to these conditions, Willow Creek area community leaders have requested that U.S. Army Corps of Engineers (USACE) implement lake restoration efforts to improve water quality. The research and data collected through this project will support the development of a comprehensive restoration plan aimed at improving environmental conditions for public benefit. Additionally, this project will provide essential monitoring and reporting of water temperature and pH levels required to meet public health standards.

A. The U.S. Army Corps of Engineers (USACE) invites proposals for a project to conduct a comprehensive uncertainty analysis for new outflow rating equations associated with a critical water control structure on Lake Superior. The primary focus of this funding opportunity is to enhance the accuracy and reliability of discharge measurements, which are fundamental to the effective management of the Great Lakes system under the Lake Superior Regulation Plan. The base task, along with both options, are all tasks that are related to improving Lake Superior outflow regulation. However, these tasks are not interdependent. The base, option 1 and option 2, are simply a priority given to these tasks if funding should be available. Task 1: Current operational procedures for the structure’s gates include partially open settings that are not accounted for in historical rating equations. To address this, new rating equations are currently under development by a team at the University of Michigan using advanced physical and computational fluid dynamics (CFD) modeling. A key requirement for a successful proposal under this announcement is a well-defined plan for the awardee to work collaboratively and integrate their efforts with the existing University of Michigan modeling team. This partnership will be essential to ensure the resulting uncertainty analysis is robust and directly applicable to the new ratings. The principal outcome of this work will be a quantified uncertainty band for discharge rates corresponding to various gate openings and water levels. The uncertainty analysis should use the publicly available Large Lake Statistical Water Balance Model, so the uncertainty values are consistent with already operational uncertainty models for all other components of the Great Lakes water balance. This task will require a 12 month performance period so the results can be used in an upcoming study. Depending on availability of funding, the U.S. Army Corps of Engineers may award the following optional work: Task 2: The development and calibration of a high-fidelity hydrodynamic model of the St. Marys River built using the Delft3D FM suite. The scope of this model be the entire St Marys River from Point Iroquois on Lake Superior to the outlet of the River near Detour Village on Lake Huron. The domain shall include the North Channel of Lake Huron to Little Current Ontario but exclude connections to Georgian Bay. The model will be fully three-dimensional, focus on the St Marys Rapids and be able to incorporate the rating equations and uncertainty analysis proposed above. Delft3D FM must be used as the United States Government as well as partners at Environment Climate Change Canada both have access to this modeling suite. The United States Government will provide water level and velocity data to calibrate the model as well as computational resources. Successful projects will deliver technically sound uncertainty metrics that can be immediately integrated into USACE operational models, contributing to improved ecological outcomes and more effective water resource management. As well as the ability to provide scopes of work for the additional tasks should they be funded.