This amazing map is a guide to San Francisco’s hidden waterways

Grist
By Heather SmithJun 30, 2015, 7:34 pm40 pts
The first time I went on one of Joel Pomerantz’s tours of San Francisco, we hiked up to one of the few remaining aboveground portions of Islais Creek, part of the city’s old freshwater system. The creek used to run through the Mission and out into the bay; now it runs far out of sight, under a feeder road…

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