Together, these muscles support the spine and help keep it aligned, working to alleviate sciatica pain. 1  Extensions. Lie on your stomach, with your arms and legs stretched out. 2  Curl-ups. Lie on your back with the knees bent. 3  Leg Raises. Lie on your back with your hands behind the head.
Natural History. Grand Coulee Dam is positioned in an area which sits on the edge of two geologic zones â the Okanogan Highlands and the Columbia Plateau. The dam sits on the solid granitic rock of the Okanogan Highlands, making a perfect base for the dam. The Columbia Plateau to the South consists of layers of softer basalts. The Columbia River in the Grand Coulee region was carved between these two geologic zones.
May 28  September 14: 10 a.m., 11 a.m., noon, 1 p.m., 2p.m., 3 p.m., 4 p.m., & 5 p.m. Sept 15  Sept 30: 10am, noon, 2 pm & 4 pm. Visitor Center Shuttle to ride across top of the dam, with a stop on the spillway. Because tour times can change, please contact the Grand Coulee Dam Visitor Center at. (509) 633-9265 Open 7 days a week ~ see hours below.