SAN FRANCISCO (CBS SF) — Dust off your binoculars. There’s going to be a big event on the bay — and probably a big backup, as well.

Caltrans work crews are going implode part of the old Bay Bridge.

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Workers are loading up one of the piers with explosives.

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The plan is to implode the structure at 9 a.m. on Saturday.

It will happen in a matter of seconds but since it is expected to send debris into the air, Caltrans will shut the bridge down for 15 minutes.

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It is going to be an expensive operation. Reportedly the price tag on the implosion is $160 million.