
The land shown in yellow is owned by Seattle’s water department. They limit activities on it to protect their 60-inch-diameter Chester Morse reservoir pipeline. The pipeline runs just north of Legacy Square/Gateway Park (left) and beneath the center of the Piazza (lower right).
As crews rush to complete Legacy Square, the Piazza, and the Pavilion, they have to be extremely careful digging in the ground or driving trucks on the site. Seattle’s most important water pipeline system runs straight through the construction site, just a four feet under the surface. Any errant equipment operator who strikes this pipeline could cause a break that could dump 100,000 gallons per minute into downtown Renton, and deprive Seattle of 70% of its water. It’s actually a pair of pipes through the Piazza, one is 52 inches in diameter and one is 66 inches. The 66 inch pipeline is seventeen times bigger in cross-section than the 16 inch pipe that flooded Houser Way and Renton’s 200 Mill Avenue (former City Hall) building last week.
Safely working around this pair of pipelines must remain front and center, as the Piazza work crews have just 46 workdays left to complete this project before the June 2nd Farmers Market. They can’t rush their digging work, or introduce any extra personnel that have not been fully briefed on the pipeline risks.

As the pipeline carries water across Renton towards Seattle, it runs along South 3rd Street until it gets to the Piazza Park. At that point it slightly turns and runs under the Piazza and just north of Gateway Park (future Legacy Square). The pipeline property is used for parking and landscaping in Renton, with no trees planted on top of it. Renton held extensive negotiations with Seattle before building the Piazza in 2000.






































































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