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Hydrologic Unit 14050001, Rio Blanco County <br />The USBR recommended changing from the Pyramid st ation to the Yampa station. The topography of <br />the irrigated area is more similar to the topography surrounding the Marvine Ranch station as compared <br />to the Yampa station. Local orographic effects seem to influence weather patterns greatly when <br />comparing precipitation at Yampa (16.10 inches), Pyramid (21.51 inches), and Marvine Ranch (25.02 <br />inches). Based upon an analysis of precipitation, topography, and the location of irrigated lands, it is <br />recommended that two weather stations be used in this unit. Temperat ure data from the Marvine Ranch <br />station and precipitation data from the Pyrami d station should be used for this unit. <br />Hydrologic Unit 14050001, Routt County <br />The USBR recommended amending the 50/50 percent weighted average of data from the Hayden and <br />Steamboat Springs stations by adding data from the Yampa station. The result is a weighted average <br />consisting of 40 percent from Yampa, 30 percent from Hayden, and 30 percent from Steamboat Springs. <br /> The basis for this recommendation is unknown. <br />Five weather stations were considered for this unit: Craig, Hayden, Yampa, Steamboat Springs and <br />Pyramid. Temperature differences between Craig, Hayden, and Yampa are about what one would <br />expect given the elevation differences between th e stations. Maximum and minimum temperatures at <br />Steamboat Springs are lower than expected, given the elevation differences. Pyramid is a precipitation <br />data only station. <br />The topography varies greatly throughout this unit a nd may contribute to microclimate effects. Based <br />on an inspection of the NOAA weather atlas, precipitation varies significantly throughout this unit. For <br />example, the precipitation at Steamboat Springs is 22.14 inches, and the precipitation at Hayden is <br />16.01 inches. <br />Weather station recommendations are based upon the loca tion of the irrigated area with respect to the <br />weather stations and topography. The Yampa stati on is recommended for lands tributary to the Yampa <br />River, upstream of the confluence of the Yampa River and Service Creek. The Steamboat Springs <br />station should be utilized for lands tributary to Elk River as well as lands tributary to the Yampa River <br />downstream Service Creek and upstream of its conf luence with Soda Creek. The Hayden station should <br />be used for lands tributary to Trout Creek which ar e downstream of its confluence with Fish Creek, for <br />lands along the Yampa River downstream of Soda Cr eek and for lands in the Elkhead Creek drainage. <br />Precipitation from the Pyramid station and temperat ure from the Yampa station should be used for lands <br />tributary to Trout Creek upstream of its confluence with Fish Creek. <br />Hydrologic Unit 14050002, Moffat County <br />The USBR recommends continuing to use the Maybe ll station for this unit. However, based upon an <br />analysis of precipitation, topography, and the locati on of irrigated lands, it is recommended that two <br />weather stations be used in this unit. Temperat ure from the Maybell station and precipitation from the <br />Hamilton station should be used for lands tributary to Milk Creek (i ncluding Stinking Gulch and Wilson <br />Creek). Temperature and precipitation from the Mayb ell station should be used for the remainder of <br />this unit (mostly lands along the Yampa River). <br />3 <br />12.3.96 12.09-15 - Walter <br />