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<br />O~22~"3 <br /> <br />. <br /> <br />Table 2.--Republican River and tributaries <br /> <br /> Miles Drainage <br /> above area <br />Stream mouth (square miles) <br />North Fork Republican River 421. 7 1,998 <br />Arikaree River 421. 7 1,918 <br />South Fork Republican River 393.6 2,726 <br />Trenton Dam 374.6 (7,766) <br />Frenchman Creek 360.7 3,765 <br />Red Willow Creek 336.3 742 <br />Medicine Creek 314.2 874 <br />Sappa Creek 261.3 3,789 <br />Beaver Creek ( 12.3) (2,107) <br />Prairie Dog Creek 243.0 1,007 <br />Harlan County Dam 239.4 (20,753) <br />White Rock Creek 136.2 379 <br />Buffalo Creek 104.3 389 <br />Other minor tributaries 7 ,368 <br />Republican River 24,955 <br /> <br />~. Topography. The Republican River basin lies within the <br />Interior Plains region, with surface elevations dropping gradually <br />from 5,500 feet above mean sea level in the Colorado headwaters to <br />elevation 1,060 feet, m.s.l., at the mouth in east-central Kansas. <br />In Colorado, the basin includes a vast expanse of gently-rolling <br />table lands broken by canyons and low hills. In the northeastern <br />corner of Colorado and in Nebraska, there is a considerable area of <br />sandhills having little or no surface drainage. The streams, which <br />are deeply entrenched in the headwater reaches, have developed wide <br />valleys in the middle and lower parts of the basin. The valleys of <br />the Republican River and of its tributaries are comparatively <br />straight and broad in relation to the drainage areas. Above Harlan <br />County Reservoir, the Republican River has an average slope of 7.3 <br />feet per mile; below the dam, the slope averages 3.4 feet per mile. <br />Throughout its entire 422 miles, the river has a meander factor -- <br />river mileage divided by valley mileage -- of 1.3 as it traverses <br />from one side of the valley to the other. The flood plain between <br />Trenton Dam and Harlan County Reservoir contains 71,660 acres, and <br />that between Harlan County Dam and the Milford Reservoir area <br />encompasses almost 192,000 acres. The river channel is described in <br />more detail in paragraph 17. <br /> <br />. <br /> <br />~. Geology and soils. From the mouth of the river to the <br />vicinity of Harlan County Dam, the exposed rock formations are of <br />the Permian and Cretaceous periods. The formations dip slightly <br /> <br />5 <br />