El Polin Springs (California)

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Located in the Tennessee Hollow watershed (the Presidio's southeast corner)

The Presidio of San Francisco is a National Historic Landmark District that is part of the Golden Gate National Recreation Area. It is located at the northernmost tip of San Francisco, California, at the southern end of the Golden Gate Bridge.

The modern map of the Presidio marks "El Polin Spring" at the southern foot of MacArthur Avenue, in a cozy picnic area outfitted with a cobblestone well to mark the location. The water draining from the hillside to the well tumbles over some beautiful Spanish-era brickworks in a series of miniature waterfalls, attracting birds that like to drink and shower in the cascades. Copious in February when charged by rainfall, the flow here in June has slowed to five or 10 cups per minute, and will dry to less than a trickle in October.

Sources:
Presidio Web (Stanford Univ)
Taking the waters at El Polin in the Presidio
Whispers in the Water
- Reviving the Past at the Presidio's El Polin Springs