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Geologic conditions and cultural development in three dam-site areas on the Kootenai River between Katka, Idaho, and Kootenai Falls, Mont., are discussed. The main line of the Great Northern Railway parallels the left bank of the Kootenai River between Katka and Kootenai Falls, and for long stretches the track level is not far above the water surface. An important control on river ievelopment is exerted by the railroad, as it is the principal cultural feature in the valley. The dam sites are considered primarily, as though the railroad did lot exist, and the effect of cultural control on the sites is developed secondarily, [f cultural control had been given primary consideration, it would have precluded geologic examination of two of the sites. The Katka site, in the N}£ sec. 31, T. 62 N., R. 3 E., Boundary County, Idaho, ippears to be the best natural location for a high dam to control the Kootenai River in the United.States. The favorable features of the site are, however, lullified by the presence of the railroad at low elevations in the dam and reservoir site. Tunnel No. 8 site, in the E^NW^ sec. 28, T. 33 N., R. 34 W., Lincoln County, Mont., has geologic and cultural conditions that make it unsuitable as a dam site. The Kootenai Falls sites, in sees. 13 and 14, T. 31 N., R. 33 W., Lincoln County, Mont., have favorable geologic conditions and can be developed without endangerng the railroad. Topographic and geologic investigation of the sites was made during the field season of 1934 by engineers and geologists of the conservation branch of the jreological Survey, United States Department of the Interior, through funds lupplied by the Public Works Administration.

Geology of dam sites on the upper tributaries of the Columbia River in Idaho and Montana: Part 2. Hungry Horse dam and reservoir site South Fork Flathead River Flathead County, Montana