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City engineers propose rerouting siphon sewer under I‑894 to reduce failure risk
Summary
Engineering staff briefed the Board of Public Works on a plan to eliminate a 1965 cast-iron siphon sewer beneath I‑894 by rerouting flows via Layton Avenue and tying into an existing public sewer serving English Meadow; design work will proceed and an easement from the apartment owner will be required.
City engineering staff told the Board of Public Works on Sept. 23, 2025 that the city plans to redesign a section of sanitary sewer that currently functions as a siphon under Interstate 894.
Staff said the existing siphon is an always-full, cast-iron sewer installed in 1965 and that a failure would affect a swath of properties north of Layton Avenue. Because the pipe lies under the freeway and carries flow under pressure, routine camera inspection is…
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