At the ASBC talk last night it was clear that major industrial development can still leave substantial and highly significant archaeological materials interspersed even within the boundaries of heavy impact – in this case within a few dozen metres of a major hydroelectric dam. This reminded me of a recent story I read about downtown Seattle archaeology. Due mainly to concerns about what would happen in even a moderate earthquake comparable to the Nisqually event of 2001, Seattle is planning to replace the Alaska Way viaduct – that multi-level highway which blocks the city from its own waterfront. You can watch a video of a simulation of the collapse of the viaduct here – I am sure most Seattlers would like to be done with that uncivic monstrosity, but not, perhaps, so suddenly. Ironically, the ASBC talk on Ruskin Dam was also a seismic upgrade project.
Anyway, the current plan in Seattle is to put a cut-and-cover tunnel in its place – similar to some of the tunnels recently built in Vancouver’s new Canada Line LRT. Crosscut.com’s Archaeology-savvy reporter “Mossback” (Knute Berger) has two excellent articles on the problems likely to arise when you dig such a large ditch through dense pre-contact and historic archaeology. The first article ran on May 11th, with the followup article on May 12th. If you are truly dedicated, there is a 200 page overview (6 meg PDF) of cultural resource management for the project, though it largely focuses on historic buildings and it relatively vague.