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City presents preliminary Thorpe Road tunnel options; consultant favors a parallel south tunnel
Summary
KPFF and city staff updated the commission on the Thorpe Road tunnel study, outlining parallel‑north, parallel‑south and enlargement options; preliminary preference is for a parallel south tunnel and the team flagged railroad coordination, geotechnical work and large cost differentials as next steps.
City staff and KPFF consultants presented an update on the Thorpe Road tunnel study, describing alternatives for the west crossing under BNSF rail embankments and bridge options for the east crossing under the Fish Lake Trail.
Kevin Picasso (Integrated Capital Management) introduced Mark Brower (KPFF), who said the study’s first phase focused on alternative analysis and produced preliminary preferred concepts. For the west crossing, the team evaluated three choices: a parallel tunnel south of the existing structure…
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