~ Horn Rapids Dam ~ Washington Dam 
~ 230.2 miles from PDX.
Horn Rapids Dam is about 9 miles northwest of the Tri-Cities, off Hwy 240, near the Hwy 225 Junction. The Hanford Reservation borders that bend of the river and the dam.
Horn Rapids Dam is a low-head irrigation dam and is not used for power generation, but to hold back the Yakima River to fill the irrigation canals.
GPS: 46.37889 ° N - 119.41583° W or 46° 22’ 44.00" N - 119° 24’ 56.99" W
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