Hamilton Island (Columbia River, Bonneville)

Hamilton Island on the Columbia River (near Bonneville) is a small, low-profile freshwater launch for wind sports, best known for westerly (W) summer thermal winds. Conditions are typically water-flat enough for progression, with cloudy water and river-driven movement that riders must respect. Wind is most dependable from May through September, with the strongest window generally building in late morning and running through afternoon, often peaking mid-afternoon. When you’re properly powered, the setup can feel very usable for freestyle/foiling styles; when you aren’t, the river can take over. Safety is the main theme. Strong currents are a consistent hazard, especially during high spring runoff or when the Bonneville Dam is spilling/releasing water. The shipping channel and restricted dam infrastructure add additional risk—commercial barges cannot stop or turn quickly, so keep well away from the channel and avoid any prohibited security zones. Practically, plan around the launch and environment: power lines near the approach, driftwood, cold snowmelt water (often requiring a full wetsuit even in warm months), and possible turbulence/wind shadows near trees and higher terrain on the island’s west side. If wind drops, don’t assume you can simply “park” on the water—be ready for peer support and use conservative margins.