Stack Stalk is an outdoor 2001 sculpture by Ean Eldred and the architectural firm Rigga, located along the Eastbank Esplanade in Portland, Oregon.

The sculpture, designed by Ean Eldred and Rigga and completed in 2001, was funded by the City of Portland Development Commission's Percent for Art program.

It is one of four by Rigga along the esplanade; the others are Alluvial Wall by Peter Nylen, Echo Gate by Eldred and Ghost Ship by James Harrison.

"[3] According to the Regional Arts & Culture Council, which administers the sculpture, it commemorates the "hybrid nature of the river-port as a meeting point for eastern Oregon's agriculture with ocean bound ships.

Blending a stalk of barley with a rustic smoke stack, it suspends a Japanese glass float in the sky as a reminder of the rivers connection with the Pacific Ocean.