San Francisco

Subsidence Walking Tour

12:00 p.m. | Thursday, October 27, 2011

Image credit: Flickr user Peter J Dean.

This tour has been RESCHEDULED from October 6 at 12 pm. We apologize for any inconvenience this may have caused.


There are many ways in which San Francisco is constantly on the move. One of these is ongoing subsidence: the motion of the Earth’s surface due to geological changes. Join geologist David Schwartz of the United States Geological Survey for a walk through the South of Market neighborhood on former marshland covered in the late 1800s. As we wind in and out of the side streets you will see evidence of subsidence such as garages and entrance doors below street level, changes in street grade, and broad swales in streets, with Howard Street being a primary example. This event is generously supported by Degenkolb Engineering.

This tour will last from 12 pm to approximately 2 pm.


Details provided upon request.


$10. Limit 25 people
SPUR members only
Register here

Refund Policy

Individual ticket purchases. If you request a refund between 2 and 10 business days prior to the event, SPUR can issue a 25 percent refund. Requests for refunds received less than 2 days prior to an event cannot be accommodated.

Sponsorship payments will not be refunded, as sponsorship benefits take effect immediately and are on-going through the date of the event.

Auxiliary Services

If, in order to participate in a SPUR event, you need auxiliary aids or services for a disability (e.g., qualified interpreter, qualified reader, written materials, taped texts) please submit your request five business days before the event to or 415-781-8726 x132. SPUR will work with you in identifying effective auxiliary aids or services that it can provide. If you need to cancel your request, please notify SPUR at least two business days before the event.

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