Finding San Francisco's historical waterscape

Water. When San Francisco was first becoming a city, it had many more waterways than now. Those were wet years. When dry years came the gullies became annoyances. People filled in the creeks and low areas with sand, debris and gravel. Marshes and sloughs were filled, too. The edges of the city were expanded into the Bay, making sailable water into salable lots. Today's rain goes right into sewers, for the most part. Few absorbent soils are still exposed. Remarkably, surface creeks do still flow, here and there. And when you dig, you still find groundwater. If you search you'll see springs, mostly small, seeping and trickling out onto our landscape.

Land. Look closely. The map shows recognizable cuts where streets were sculpted. Enjoy the seeking, without labels. Get to know your landscape. Find things you didn't realize you were looking for.

Visit the storefront installation

860 Divisidero Street

Seep City Map of Water Explorations and the Seep City Log book are print publications of San Francisco water historian and explorer Joel Pomerantz, founder of Thinkwalks.

Buy the map

The Seep City map is available for purchase! Order now for delivery or pickup:

Order Online

Also sold at stores in San Francisco and the East Bay.
Find out where

Pre-order the book

Get on the list to receive your copy of the forthcoming Seep City book. Sign up for email announcements at or:

Order Now Atlas Teaser Video

 Musical accompaniment courtesy of Joel Pomerantz and his harmonica.

Dare to visit the full details page...

which reveals how the map was made (sources), licensing, & other nerdy specifics!

Dive in

Recent press: