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Bear River (Utah)
The Bear River is the largest tributary of the Great Salt Lake, draining a mountainous area and farming valleys northeast of the lake and southeast of the Snake River Plain. It flows through southwestern Wyoming, southeastern Idaho, and northern Utah, in the United States. Approximately long,〔U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. (The National Map ), accessed May 4, 2011〕 it is the largest river in North America that does not ultimately reach the sea.
==Course==
The course of the river essentially makes a large inverted U around the north end of the Wasatch Range. It rises in northeastern Utah in several short forks on the north side of the high Uinta Mountains in southern Summit County. The main stem Bear River begins at the confluence of two tributaries, Hayden Fork and Stillwater Fork. The Hayden Fork originates north of Hayden Pass, just west of Hayden Peak. The Stillwater Fork originates in Middle Basin, a plateau with an elevation of about and surrounded by the high peaks of Mount Agassiz, Hayden Peak, and Spread Eagle Peak. One of the Stillwater Fork's tributaries is called Main Fork, which originates in another high–altitude basin called Hell Hole.
From its source the Bear River flows north cutting across the southwest corner of Wyoming past Evanston then weaving along the Utah-Wyoming state line as it flows north. It turns northwest into Bear Lake County, Idaho and flows through the Bear Lake Valley in Idaho, past Montpelier where it receives the short Bear Lake Outlet Canal that drains Bear Lake, which straddles the Idaho-Utah border. At Soda Springs, near the north end of the Wasatch Range, the Bear River turns abruptly south, flowing past Preston in the broad Cache Valley that extends north from Logan, Utah. It re-enters northern Utah, meandering south past Cornish and Newton. It is impounded to form the Cutler Reservoir, where it receives the Little Bear River from the south. From the west end of Cutler Reservoir it flows south through the Bear River Valley of Utah past Bear River City. It receives the Malad River from the north just before emptying into the mud flats of a broad bay on the east side of the Great Salt Lake, approximately southwest of Brigham City.
Bear River was once a tributary of the Snake River, but lava flows north of Soda Springs, Idaho diverted it into what was then Lake Bonneville.〔Bright, R.C., 1967, Tebiwa v. 10〕〔Link, P.K.; Kaufman, D.S.; Thackray, G.D., 1999, Field guide to Pleistocene Lakes Thatcher and Bonneville and the Bonneville Flood, southeastern Idaho, in Hughes, S.S.; Thackray, G.D. (editors), Guidebook to the Geology of Eastern Idaho, Idaho Museum of Natural History, p. 251-266〕〔Bright, R.C., 1963, Pleistocene Lakes Thatcher and Bonneville, southeastern Idaho, PhD dissertation, University of Minnesota, 292 pgs.〕〔Bright, R.C.; Rubin, M., 1965, Part H: Lake Bonneville, in Schultz, C.B.; Smith, H.T.U. (editors), INQUA 7th Congress, Guidebook for Field Conference E: Northern and Middle Rocky Mountains, p. 104-112〕〔Bright, R.C., 1960, Geology of the Cleveland area, southeastern Idaho, MS Thesis, University of Utah, 262 pgs.〕〔Bouchard D.P.; Kaufman D.S.; Hochberg, A.; Quade J., 1998, Quaternary history of the Thatcher Basin, Idaho, reconstructed from the 87Sr/86Sr and amino acid composition of lacustrine fossils: Implications for the diversion of the Bear River into the Bonneville Basin, Palaeogeography, Palaeoclimatology, Palaeoecology, 141, p. 95-114〕〔Hochberg, A., 1996, Aminostratigraphy of Thatcher Basin, SE Idaho: Reassessment of Pleistocene lakes, MS thesis, Utah State University, 112 pgs.〕
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