King Horn Slough Boat Ramp is a year-round access point on the Yakima River in Kittitas County featuring a single gravel ramp and one restroom facility.

The ramp has no ADA loading platform or boarding float, making it best suited for experienced boaters comfortable with basic launch conditions.

Located near the downstream end of Yakima River Reach 9, this access point provides entry to a scenic section of river with generally low hydromodification levels and good channel complexity.