By Richard W. Galster, Alan S. Imrie, John W. Sager, Fred J. Miklancic
About The Product
Published by means of the yank Geophysical Union as a part of the Field journey Guidebooks Series.
This day trip will stopover at dams built at the major stem of the Columbia River and a few of its significant tributaries in the course of the half-century among 1933 and 1983. Engineering geology difficulties linked to siting, layout, and development of those tasks and the relation of the nearby geology to a number of the websites can be mentioned. within the method, the journey will go through parts of six significant geologic provinces of the North American Cordillera: Puget Sound Basin, Cascade Mountains, Willamette Lowland, Columbia Plateau, Northern Rocky Mountains, and Okanogan- Shuswap Highlands. The Columbia River approach drains elements or all of those geologic provinces apart from the Puget Sound Basin, the place the journey will commence and finish. The approximate obstacles of those geologic provinces, including a few of their inner divisions, are proven on determine 0-1.
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Extra resources for Engineering Geology of Major Dams on the Columbia River Puget Sound Basin to Northern Rocky Mountains July 21-30, 1989
This is an active fault that has been identified by seismic and gravity evidence as spanning the width of the Rocky Mountain Trench. The maximum historic event attributed to this fault was a magnitude 5 event in 1975. North of the fault, the depth to bedrock in the trench increases, and the orientation of the trench swings from N to NW. At the same latitude (48 0 10' N) the thrust ranges to the east show a similar orientation change. Leaving Hungry Horse Dam, the excursion will again cross the Rocky Mountain Trench and pass into the more subdued ranges of the western belt of the Northern Rocky Mountains, passing a chain of lakes called the Thompson Lakes and entering the Libby Trough.
Drainage adi! No. I Downie slide, geologic section looking south (downstream). /'" / 7 //Heod scarp reservoir started filling in October 1983. The reservoir sloughing does not jeopardize the stability of the large was kept 30 ft (9 m) below normal full pool until slide mass. stabilization measures were complete. Filling was Mica Dam completed by the summer of 1984. Movement of the Stop '-2: slide mass has been insignificant, and water pressures The Mica Dam (Figure 7-4,) lies within low-to have remained low.
A 3-ft- (1 m) thick interbed separates it from the overlying Ginkgo flow. The Grande Ronde Basalt is exposed below the falls and along the lower part of the canyon, which extends to the Palouse canyon confluence with the Snake River canyon at Lyons Ferry less than 5 mi (8 km) south (Swanson and Wright, 1981). Stop 3-7: Little Goose Dam The Snake River canyon at Little Goose Dam (Figure 3-8) is cut in of upper Grande Ronde Basalt flows with the Frenchman Springs and Roza members of the Wanapum Basalt are exposed high on the canyon walls.