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<br />f' <br /> <br />0': <br /> <br />c <br />- <br /> <br /><..:. Subwatershed No. 2 <br /> <br />This subwatershed is the area on the Iron Creek drainage from Gould Reservoir <br />to the Crawford Reservo ir including the drainages of the Mud, Alkali and Clear <br />Fork Creeks. Vegetative types are principally pinon-juniper, sage and oak <br />brush. Vegetative cover is generally fair to poor and large areas of sheet <br />erosion are In evidence. Numerous water sources have been badly gullied by <br />being used as irrigation ditches and not properly stabilized. Most of this <br />area is privately owned. <br /> <br />Floods are frequent and sediment yields are high. No project lands will be <br />flooded but large amounts of sediment will be deposited in Crawford Reservoir. <br />Construction plans for the reservoir provide sediment storage but any erosion <br />control or reduction of sediment will lengthen the life of the reservoir. <br />This area is the most cri tical one in its effect on the project. <br /> <br />Subwatershed No. 3 <br /> <br />The subwatershed comprises the drainage area above Gould Reservoir. None of <br />the floodwater, s11 t or irrigation water will endanger project lands. <br /> <br />Subwatershed No. 4 <br /> <br />The subwatershed includes the Smith Fork drainage below the mouth of Iron <br />Creek and Poison Spring Gulch with some other small tributaries. Only small <br />parcels of pro ject lands will be affected by runoff. <br /> <br />Subwatershed No.5 <br /> <br />The subwatershed consists primarily of Grandview Mesa and includes a large <br />portion of the project lands. . This mesa is several hundred feet directly <br />above the Smi th Fork River so is in no danger of flooding. <br /> <br />Subwatershed No. 6 <br /> <br />This subwatershed, the Cottornrood Creek drainage, contains the lowest elevation <br />lands. Vegetative cover is poor, and IUnoff and sediment yield high. <br /> <br />Cottonwood Creak has been used in the past to r:onvey flood and irrigation <br />water. Thi s has resul ted in transforming the creek into several large <br />gullies. The creek has ample capacity to carry expected flows without flooding <br />adjacent cultivated lands. There are a few areas where bank cutting may <br />endanger fields. Control methods include stream bank protection, the leaving" <br />of a berm area between the gully and the field edge, and proper disposal of <br />waste irrigation water. <br /> <br />- 52 - <br />