How to Stabilize a Dam Spillway | Concrete Buttress & Anchor System
Brennan is proud to support Puget Sound Energy on a complex, multi-phase spillway stabilization project at Upper Baker Dam in Washington’s North Cascades. This work strengthens critical hydropower infrastructure while maintaining safe, reliable energy generation. This project required a combination of marine construction, dredging, deep foundation work, and large-scale concrete placement in a remote and highly constrained environment. The goal is to stabilize the spillway by constructing a large concrete buttress anchored to bedrock, helping prevent movement during a seismic event and ensuring long-term dam safety.
𝐏𝐫𝐨𝐣𝐞𝐜𝐭 𝐇𝐢𝐠𝐡𝐥𝐢𝐠𝐡𝐭𝐬
• Construction of a 5,000+ cubic yard concrete buttress to stabilize the spillway
• Installation of anchors and dowels into bedrock for seismic resilience
• Dredging operations to remove decades of rock debris and restore channel capacity
• Creation of temporary marine access and loading infrastructure in a remote canyon
• Placement of self-consolidating concrete pumped nearly 400 feet in a restricted work zone
𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫𝐢𝐧𝐠 𝐂𝐡𝐚𝐥𝐥𝐞𝐧𝐠𝐞𝐬
Working at an active hydropower facility required careful coordination with ongoing operations, including power generation and spillway releases. Crews navigated:
• Narrow waterways and limited access for marine equipment
• Steep canyon walls and high-scaling operations
• Environmental controls, including turbidity monitoring and wildlife protection
• Complex logistics to transport and place heavy equipment and materials
Despite these challenges, the team successfully advanced the project while maintaining strict safety and environmental standards.
𝐒𝐚𝐟𝐞𝐭𝐲 𝐚𝐧𝐝 𝐄𝐧𝐯𝐢𝐫𝐨𝐧𝐦𝐞𝐧𝐭𝐚𝐥 𝐒𝐭𝐞𝐰𝐚𝐫𝐝𝐬𝐡𝐢𝐩
Safety is central to every Brennan project. From dredging to concrete placement, each phase was executed with a focus on protecting personnel, the surrounding environment, and the integrity of the operating facility.
Environmental mitigation efforts, including turbidity monitoring and erosion control, ensured that water quality and local ecosystems remained protected throughout construction.
𝐖𝐡𝐲 𝐓𝐡𝐢𝐬 𝐏𝐫𝐨𝐣𝐞𝐜𝐭 𝐌𝐚𝐭𝐭𝐞𝐫𝐬
Projects like Upper Baker Dam highlight the importance of proactive infrastructure investment in hydropower systems. By stabilizing critical components today, owners can reduce risk, extend asset life, and ensure continued energy production for the future.
𝐀𝐛𝐨𝐮𝐭 𝐁𝐫𝐞𝐧𝐧𝐚𝐧
J.F. Brennan Company (Brennan) delivers specialized marine construction, environmental remediation, and infrastructure solutions across North America. Since 1919, Brennan has combined top-tier expertise, advanced equipment, and skilled teams to safely and efficiently support projects ranging from dams and hydropower facilities to ports and environmental restoration.
Visit us at: https://www.jfbrennan.com