Agate Pass or Agate Passage is a high-current tidal strait in Puget Sound connecting Port Madison and mainland Kitsap County in the US state of Washington. It lies between Bainbridge Island and the mainland of the Kitsap Peninsula near Suquamish. It leads south towards Bremerton, extending about one mile (1.6 km) in a straight, southwesterly direction. The depth is about 20 ft. The shores are wooded and fairly steep. The shoreline is mostly rocky and fringed with kelp to Point Bolin. The tidal currents have velocities up to six knots; the flood tide sets southwesterly, and the ebb tide northeasterly.