Wednesday, January 13, 2010

Great Highway Lane Closure

As of January 7th, DPW has shut down one of the southbound lanes on Great Highway past Sloat.

I ran down to take a look on the morning of the 9th. The spot that threatens the roadway the worst is just north of the rip-rap over the PUC's outflow pipe. A few smaller rocks at the bottom which neither provide support for the slope nor dissipate much wave energy. Visually, it was not apparent the frequency with which waves could be expected to reach the crumbling cliff. I suspect the agencies involved would want to take some measurements to determine where the cliff is in relation to MLLW and what type of wave run-up would be expected.

There is rip-rap and the remnants a few piles from the construction pier when the outflow pipe was first installed just south of the erosion spot. All in all, the outflow pipe looks well protected, and not immediately threatened. The pavement though, has just a few feet of sandy soil near the edge. It's clear why DPW stepped in and closed down the road.

If any dogwalkers, surfers, or frequent beach users with a digital camera want to take photos, feel free to send them to the email associated with this blog.

SF Chronicle Story Link
DPW Press Release Link

Interested in the backstory? (I'm unsure of the date on this one)
SF Gov Background PPT

No comments:

Post a Comment