City reports breakthrough on Rack 32 tunnel; mainline 16.5‑ft tunnel begins tunneling toward river
City engineers reported a successful breakthrough of the 10‑ft‑diameter Rack 32 interceptor tunnel (about 2,000 feet) and noted that the larger 16.5‑ft mainline tunnel mining beneath Riverside Drive has just started; tunneling schedules estimate the mainline will finish this fall.
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City storm‑water staff updated the Public Service Committee on progress in two tunnel projects that are part of the north‑side interceptor work to control combined‑sewer overflows.
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