Laserfiche WebLink
LOST CREEK DESIGNATED GROUND WATER BASIN <br />2012 <br /> <br /> <br />This report contains the basic groundwater level data collected from wells in the Lost Creek <br />Designated Basin during the period from 2002 through 2012. Acquisition and publication of this <br />information is a cooperative effort between the well owners, Lost Creek Ground Water <br />Management District and the Colorado Division of Water Resources. The project is part of a <br />statewide ground water level monitoring program funded by Senate Bill 200 (1987 legislative <br />session). This legislation directed that a portion of the fees collected for water well permit applications be used for the establishment of a program to monitor water level trends throughout the state. The wells in this report are listed by township, range and section, beginning at the north end of <br />the basin and proceeding south. Tabular data are presented for each well for the previous ten <br />years. Graphical data are presented for the entire period of record. Analyses of changes in the <br />water level in the aquifer are complicated by unknown pumping schedules. As the measurements <br />made in 2012 were taken later in the spring than normal, some irrigation wells had been actively <br />pumping. <br /> <br />The report contains water level measurements for twenty-five wells. The locations of those <br />wells and the extent of the alluvial aquifer are shown on the following map. Previous work in <br />the basin (Topper, 2011) suggests that analysis of groundwater levels by subregions is <br />appropriate. Water level measurements are typically recorded in the spring of each year. At the <br />request of the Management District, fall 2011 water levels were also recorded. This report <br />contains both the fall and spring measurements, which were collected on November 1, 2011 <br />and April 5, 2012. For the fall 2011 data, depth to groundwater, below land surface, ranged <br />from 6 to 119 feet. A comparison to the fall 2009 water levels, the earliest prior fall data <br />available, produced the following general conclusions: <br />North Area: North of Roggen/I-76 to Hwy 34 <br />• November 2011 water levels were generally 1-3 feet lower than reported in 2009 <br />Middle Area: Between Roggen/I-76 and Prospect Valley/Hwy 52 <br />• With two exceptions, November 2011 water levels were 1-6 lower than reported <br />in 2009 <br />South Area: South of Prospect Vally/Hwy 52 to 144th Avenue • November 2011 water levels were 0-19 feet higher than reported in 2009 For the spring 2012 data, depth to groundwater, below land surface, ranged from 5 to 118 feet. A comparison of fall 2011 to spring 2012 water levels indicated that water levels at the end of <br />the irrigation season were 0-10 feet lower than those recorded in the spring when water levels <br />recovered. Two wells, S-23A and GS-5, were opposite of this trend presumably due to <br />pumping prior to the spring measurement. Subregion analysis of the spring 2012 water levels <br />indicates that the water table is approximately 5-35 feet below ground in the north area, 30-60 <br />feet below ground in the middle area, and 45-120 feet below ground in the south area. <br /> <br />On average, ground water levels in wells measured by the Division of Water Resources were <br />down by 1.6 feet compared to 2011. The medium term, 5-year trend showed both rises and <br />declines that averaged out to a 1.5 feet decline. Over the long term, 10-year trend, all wells