MWH provided construction management services for the L.L. Anderson Dam Spillway Modification Project, an award-winning, heavy civil infrastructure project located within the Tahoe National Forest. The project increased spillway discharge capacity to safely pass the updated Probable Maximum Flood (PMF) without overtopping the dam, protecting downstream communities and critical water and hydropower infrastructure.
The team successfully completed this complex, high-altitude project on schedule and within budget despite severe weather, remote access, and stringent regulatory oversight by FERC and the California Department of Safety of Dams.
Key improvements included precision rock excavation and controlled blasting, construction of a new reinforced concrete spillway control structure with twin 36.5-foot-wide radial gates, extensive shotcrete and rock-bolting for erosion control, seepage cutoff grouting, and a raised dam crest with new parapet walls.
MWH’s proactive partnering, advanced cost and schedule controls, and robust safety and quality management programs resulted in zero recordable incidents, no claims, and completion 10 days ahead of schedule. The project earned recognition as the ASCE California Construction Project of the Year and the CMAA Northern California Project Achievement Award for its innovation, technical excellence, and public safety benefits.
The MWH Breckenridge Conference featured 13 insightful presentations, recognizing standout contributions in engineering, innovation, and project leadership. Two teams were selected to join Obayashi’s training program in Tokyo.
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MWH was awarded the 2023 ENR Intermountain Award of Merit in the Water and Environment category for the Logan Regional Wastewater Treatment Facility (WWTF). The award recognized the team’s hard work and dedication in completing the largest single capital improvement project for the City. Lance Ota, Project Manager, graciously accepted the award on behalf of the team.
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MWH is continuing to work uninterrupted on the Biosolids Digester Facilities Project (BDFP). The long-term, large-scale project represents a significant overhaul of the Southeast Treatment Plant, San Francisco’s largest wastewater pollution treatment plant. BDFP is set to redefine the way wastewater is treated in the city, aiming to process up to 800 million gallons per day (MGD) and serving about 80% of the city’s population. Implementing state-of-the-art technologies and innovation, the project underscores MWH’s commitment to environmental sustainability and urban rejuvenation. The revamped plant will set new standards in waste management and pollution control, marking a major milestone in San Francisco’s environmental management history.
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