Description - Lower Granite Dam is part of the Columbia River Basin system of dams. It was built and is operated by the United States Army Corps of Engineers. Power generated is distributed by the Bonneville Power Administration.
- A marina and launching ramps are available at Lower Granite Lock and Dam along the Snake River.Lower Granite Dam is the most upstream dam in the Snake River system that has fish ladders (2) to allow adult salmon and steelhead to migrate upstream.
Recreation - Fishing and boating opportunities are available along the Snake River. Camping and picnicking are available. Water sports and hunting opportunities also are present.
Climate - The climate of Washington varies within each region. The Cascades split the state and alter the weather patterns. The mountains receive large amounts of wet, heavy snow from October through May. These peaks remain snow covered throughout the year. The terrain east of the mountains receives approximately 12 inches of rainfall per year, generally much less than west of the mountains. Since the area east of the mountains is landlocked, temperatures in this region are lower during the winter months. Frequent winds coming down from the mountains also contribute to the low temperatures of eastern Washington.
Due to the coastal geography, western Washington is primarily temperate. The proximity to the ocean stabilizes the climate, making extreme temperatures very rare. The area receives large amounts of precipitation from Pacific rain and snow storms.
From Pomeroy, travel 20 miles northeast and follow the signs to reach Lower Granite Lock and Dam. A map is available on this page.