Crossharbour Tunnel

P—109

2.3 km

Bore length

Crossharbour Tunnel

Client

Transport authority

Client

Transport authority

Location

Seattle, WA

Sector

Transportation

Delivery

Alliance

Value

$760M

Duration

52 months

Status

In progress

Year

2028

§ 01 — Overview

A twin-bore road tunnel holed through 11 days ahead

The challenge

A twin-bore road tunnel beneath an active harbour, through variable glacial soils.

Engineering approach

Ground investigation was extended along the full alignment, and the alliance agreed a risk-sharing model for unforeseen conditions before boring began.

Execution

Both bores broke through eleven days ahead of the programme, with settlement at the surface kept within design limits throughout.

§ 05

Key metrics

2.3 km

Bore length

18,400

Ring segments

11 days early

Breakthrough

Within limits

Settlement

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