Warwick Dam Study & Analysis

The Warwick Dam is a critical infrastructure asset located on the Sheyenne River in Eddy County, just south of Warwick in North Central North Dakota. The dam, initially constructed in 1933 and subsequently modified in 1952, has played a pivotal role in the region’s water management and flood control. However, due to frequent and severe flooding events, the dam has experienced significant structural damage over the last two decades. This damage has compromised the integrity and functionality of the dam, necessitating urgent rehabilitation and modification efforts.

The Sheyenne River, known for its periodic flooding, has subjected the Warwick Dam to continuous stress and erosion. The original low-head dam, designed for the conditions of the early 20th century, is now inadequate to handle the current hydrological challenges. Flooding has led to the degradation of the dam’s structural components, including the concrete abutments and spillway, as well as severe erosion on the south and north banks in the vicinity of the dam. The sustained damage has raised concerns about the dam’s safety, reliability, and effectiveness in water management.

After extensive analysis and consideration of various options, the Eddy County Water Resource District has decided to proceed with a comprehensive rehabilitation and modification plan for the existing concrete dam structure. This alternative is designed to address the dam’s multifaceted issues and restore its operational integrity. The key components of this project include:

• Rehabilitation of Concrete Abutments and Spillway:
  • The existing concrete abutments and spillway will be repaired to restore their structural integrity. This involves addressing cracks, spalling, and other forms of deterioration that have occurred over time.
• Bank Erosion Repair and Protection:
  • The project will address the severe erosion on the south and north banks near the dam. This will involve stabilizing the banks to prevent further erosion and protect the surrounding landscape. Erosion protection measures, such as installing rock riprap, will be implemented to ensure long-term stability.
• Installation of Sheet Piling and Rock Riprap:
  • Sheet piling will be installed for the abutments and dam sill to enhance structural stability and prevent undermining of the dam. Additionally, rock riprap will be used to reinforce the dam and provide added protection against erosion and water flow.
• Enhancement of Fish Passage:
  • As part of the rehabilitation efforts, the project will incorporate features to improve fish passage in the area. This is crucial for maintaining the ecological balance and supporting the local aquatic ecosystem.

The selected rehabilitation and modification plan offers numerous benefits:

• Enhanced Structural Integrity: Rehabilitating the concrete components and installing sheet piling and rock riprap will restore the dam’s structural integrity, ensuring its safe and reliable operation for years to come.
• Improved Flood Management: By addressing the erosion issues and reinforcing the dam, the project will enhance the dam’s ability to manage floodwaters effectively, reducing the risk of downstream flooding.
• Environmental Sustainability: The incorporation of fish passage features demonstrates a commitment to environmental stewardship, supporting local biodiversity and aquatic life.
• Community Safety and Resilience: The project will enhance the safety of the surrounding communities by mitigating the risks associated with dam failure and uncontrolled flooding.

The rehabilitation and modification of the Warwick Dam represent a vital investment in Eddy County’s infrastructure and environmental health. Through comprehensive planning and execution, this project aims to restore the dam’s functionality, enhance flood management capabilities, and support the ecological well-being of the Sheyenne River. The Eddy County Water Resource District’s decision to proceed with this alternative underscores its commitment to sustainable water resource management and community safety.