Seattle City Councilmember Mike O’Brien has a blog post up on the likelihood of cost overruns on the Big Bore tunnel. The conclusion?
- 40% chance of any cost overrun
- 30% chance of a cost overrun greater than $90 million
- 20% chance of a cost overrun greater than $150 million
- 10% chance of a cost overrun greater than $290 million
- 5% chance of a cost overrun greater than $415 million
And these are WSDOT’s estimates, not O’Brien’s.
So I guess the question is, are you comfortable with these odds? And if not, do you feel lucky?