McMillin Reservoirs Tacoma Water needed to cover the last of its existing open air storage reservoirs. After an extensive study of various cover options, Tacoma Water decided to construct two 33 MG pre-stressed, strand-wrapped concrete reservoirs inside the footprint of the existing McMillin Reservoir No. 2. Construction of the tanks will result in the world’s largest diameter, pre- stressed, post-tensioned tanks. The project includes 64 separate roof and floor slab pours, 664 columns, and more than 300 miles of strand wrapped around the tank. Site work includes the demolition of portions of the existing 100 MG open top, concrete McMillin Reservoir No. 2, site grading to backfill the proposed reservoirs within 2 feet of roof levels, site drainage, and reconfiguration and extension of the s

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