A slideshow of the Salmon Street Springs fountain, in Waterfront Park at SW Salmon, just north of the Hawthorne Bridge. The city Water Bureau, which is responsible for the fountain, describes it:
This fountain celebrates city life. A computer regulates the changing patterns of the water display. At full capacity the fountain recycles 4,924 gallons of water per minute through as many as 137 jets at once. There are 185 jets.
The Portland Development Commission funded the fountain. It was dedicated in 1988. A contest generated the name in 1989. Robert Perron Landscape Architects and Planners designed the fountain. The three cycles of the fountain are called misters, bollards and wedding cake.
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The slideshow has photos of all 3 modes, plus a few taken while it was turned off for the winter. The fountain's a local landmark, and it's also relatively recent in origin, so I don't have any obscure historical details to share about the thing. Which is probably why I haven't gotten around to covering it until now. Still, it's pleasant enough & I figured it at least merited a slideshow here.