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2.1.3 Land Ownership <br />The Alamosa ~Iatershed is located in Rio Grande and Conejos Counties. Land ownership is primarily <br />federal and private. Most of the watershed upstream of Terrace Reservoir is in the Rio Grande National <br />Forest. Another portion is part of the Bureau of Land Management's San Luis Resource Area. The land <br />in the valley below Terrace Reservoir is primarily privately owned and is used for agricultural purposes. <br />Figure 2-2 shows the distribution of land ownership in the watershed between federal, state and private <br />lands. <br />2.1.4 Segments <br />The Alamosa River was divided into segments and subwatersheds based on physical homogeneity. The <br />segment endpoints were chosen as locations that are identifiable in the field and on maps. Generally, the <br />segments are broken at major changes in slope, confluences with major tributaries, or man-made <br />structures. In the upper watershed, dividing segments using major tributaries aids in discussion of major <br />sources of water quality problems and sediments. The Alamosa River was divided into 12 segments. <br />~Iightman Fork of the Alamosa River was broken into 4 segments. Treasure Creek was considered a <br />segment of its own. The segments are referred to throughout this report. <br />Table 2-1 summarizes some general characteristics of each segment/subwatershed. These segments are <br />shown in plan view in Figure 2-3. The profiles of the Alamosa River and major tributaries are shown in <br />Figure 2-4. The outline of each subwatershed is shown on USGS quad map background in <br />Appendix F. <br />Table 2-1. Alamosa River Segment and Subwatershed Characteristics <br /> <br /> <br />Number <br /> <br />Description <br />Length <br />(miles) <br />Area <br />(min) Upstream <br />Elevation <br />Ift MSL) Downstream <br />Elevation <br />Ift MSL) <br />Average <br />Slope <br />1 County Road 10 to Point of last diversion 7.4 13.0 7,721 7,580 0.4°/° <br />2 Gunbarrel Road to County Road 10 5.3 10.3 7,931 7,721 0.8°/° <br />3 Terrace Main Canal to Gunbarrel Road 5.6 3.9 8,173 7,931 0.8°/° <br />4 Terrace to Main Canal to Terrace Outlet 5.6 10.3 8,560 8,173 1.3°/° <br />5 Terrace Reservoir 2.7 2.7 8,560 8,560 0.0°/° <br />6 French Creek to Terrace Reservoir Inlet 4.1 6.8 8,726 8,560 0.8% <br />7 Beaver Creek to French Creek 2.3 11.3 8,930 8,726 1.7°/0 <br />8 Fern Creek to Beaver Creek 4.2 17.2 9,054 8,930 0.6°/° <br />9 Jasper Creek to Fern Creek 1.8 12.5 9,116 9,054 0.7°/° <br />10 Wightman Fork to Jasper Creek 3.2 6.3 9,377 9,116 1.5°/° <br />11 Iron Creek to Wightman Fork 4.9 12.7 9,891 9,377 2.0°/° <br />12 Treasure Creek to Iron Creek 2.9 11.5 10,426 9,891 3.5°/° <br />T1 Treasure Creek 5.7 13.6 13,300 10,426 9.5°/0 <br />W1-4 Wightman Fork of Alamosa River 6.2 15.9 11,468 9,377 6.4°/° <br />Alamosa River Watershed Restoration Master Plan and Environmental Assessment Page 2-3 <br />