Base of Principal Aquifer for Parts of the North Platte, South Platte, And
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U.S. Department of the Interior Prepared in cooperation with the Scientific Investigations Map 3310 U.S. Geological Survey North Platte Natural Resources District, South Platte Natural Resources District, Twin Platte Natural Resources District, Conservation and Survey Division of the University of Nebraska-Lincoln, and the Nebraska Environmental Trust Sheet 1 of 2 104° 103° 102° 101° 104° 103°30’ 103° 102°30’ 102° 4,500 State Route 4,400 17 4,500 4,400 e 2 t u State Route 27 4,450 4,350 oR e 42° t a tS State Route 87 4,300 State Route 29 4,250 4,400 4,450 US Route 385 4,300 4,550 4,500 State Route 250 4,500 0 4,350 5 4 , 4 4,400 4,400 4,350 4,400 4,350 4,350 4,350 State Route 2 4,300 4,300 4,150 41° 4,250 4,200 4,300 4,150 4,250 US Route 26 4,100 4,100 4,300 4,150 4,250 4,350 Index map 4,350 North Platte Natural 4,150 Resources District EXPLANATION 4,100 4,200 4,100 4,350 State Route 156 4,050 4,150 South Platte Natural Resources District (NRD) 4,350 4,100 airborne electromagnetic area 4,000 4,100 Twin Platte Natural 4,100 4,300 Resources District Twin Platte NRD airborne electromagnetic area 4,050 4,000 4,050 4,100 3,950 North Platte NRD airborne electromagnetic area 3,900 4,200 4,200 2010 airborne electromagnetic flight line 4,050 4,200 4,250 4,200 4,250 2008 and 2009 airborne electromagnetic flight line 3,950 4,250 4,250 (Abraham and others, 2012) 42° 4,000 4,250 4,000 3,950 South Platte Natural 4,050 4,200 Cooperative Hydrology Test hole 4,000 4,250 Resources District Study boundary 4,150 4,150 3,850 3,900 4,200 3,950 3,900 Base from National Atlas of the United States, 2014 030 60 MILES Shaded relief from Esri, 2013 3,900 4,100 Lambert Conformal Conic projection 3,800 3,850 4,150 4,150 4,150 Horizontal coordinate information is referenced to the 4,100 Creek 0 30 60 KILOMETERS North American Horizontal of 1983 (NAD 83) 3,800 3,950 4,100 3,850 3,850 3,750 4,100 92 92 4,100 Figure 1. Location of 2010 airborne electromagnetic (AEM) flight lines (this study), and 2008 and 2009 airborne electromagnetic flight lines. 3,900 4,200 e 4,200 3,950 tu 4,100 3,900 3,900 4,050 4,050 4,150 o 4,000 R 4,000 3,950 4,050 the BOA configuration is the use of airborne electromagnetic (AEM) etatS 3,800 3,950 ABSTRACT 4,050 3,900 4,000 4,150 surveys. State Route 161 3,850 3,800 EXPLANATION 4,050 4,100 Tributary of 4,100 4,100 Water resources in the North and South Platte River valleys of From 2008 to 2010, the USGS and its cooperators collaborated 3,750 4,000 3,950 Structure contour—Shows altitude of base of aquifer. Dashed Nebraska, including the valley of Lodgepole Creek, are critical to the to use airborne geophysical surveys for areas of the North and South 4,150 3,900 4,050 4,200 3,950 4,100 where approximately located. Contour interval is 50 feet. Datum 4,000 social and economic health of the area, and for the recovery of threat- Platte River valleys including the valley of Lodgepole Creek in 4,150 4,250 3,900 is National Geodetic Vertical Datum of 1929 (NGVD 29) 3,900 3,900 3,900 3,750 ened and endangered species in the Platte River Basin. Groundwater western Nebraska (fig. 1). The objective of the surveys was to map 3,800 3,850 3,850 4,000 3,100, 3,350, 3,600, 3,850, 4,100, 4,350, 4,600, 4,850, 5,100, 5,350 State Route 92 4,300 3,850 and surface water are heavily used resources, and uses are regulated the aquifers and underlying bedrock topography of selected areas to 4,100 3,900 3,850 3,950 3,150, 3,400, 3,650, 3,900, 4,150, 4,400, 4,650, 4,900, 5,150 3,900 3,950 4,050 3,850 in the study area. Irrigation is the dominant water use and, in most help improve the understanding of groundwater and surface-water 4,150 4,200 3,700 3,900 3,200, 3,450, 3,700, 3,950, 4,200, 4,450, 4,700, 4,950, 5,200 3,750 3,800 4,250 4,800 4,450 instances, is supplied by both groundwater and surface-water sources. interactions to guide water-management decisions. This project was 4,200 4,5504,000 3,750 3,250, 3,500, 3,750, 4,000, 4,250, 4,500, 4,750, 5,000, 5,250 4,500 3,850 4,400 4,300 3,700 4,000 4,000 The U.S. Geological Survey and its partners have collaborated to use a cooperative study involving the Nebraska Environmental Trust, 4,400 3,800 4,300 4,550 4,550 4,350 3,300, 3,550, 3,800, 4,050, 4,300, 4,550, 4,800, 5,050, 5,300 4,750 3,850 4,200 4,600 3,750 airborne geophysical surveys for areas of the North and South Platte the NPNRD, the South Platte Natural Resources District (SPNRD), 4,200 4,700 4,400 4,250 4,600 4,450 4,200 3,850 4,550 4,650 4,450 State Route L62A Alt Structure contour control point—Symbol color indicates elevation River valleys including the valley of Lodgepole Creek in western the Twin Platte Natural Resources District (TPNRD), Conservation 4,350 4,500 4,350 4,250 4,250 4,300 3,900 3,900 4,500 4,700 3,750 range, in feet above NGVD 29 4,450 4,450 3,650 Nebraska. The objective of the surveys was to map the aquifers and and Survey Division of the University of Nebraska-Lincoln, and the 4,600 3,800 3,850 4,000 4,200 4,500 3,800 3,100–3,150, 3,350–3,400, 3,600–3,650, 3,850–3,900, 4,100–4,150, 4,400 4,300 4,150 4,550 underlying bedrock topography of selected areas to help improve USGS. 4,550 4,100 3,850 3,750 4,350–4,400, 4,600–4,650, 4,850–4,900, 5,100–5,150, 5,350–5,400 4,450 4,600 3,950 the understanding of groundwater–surface-water relations to guide 4,250 4,600 This report presents the interpreted BOA surface for parts of the 3,750 3,850 3,900 3,150–3,200, 3,400–3,450, 3,650–3,700, 3,900–3,950, 4,150–4,200, 4,300 4,300 4,400 4,450 4400–4,450, 4,650–4,700, 4,900–4,950, 5,150–5,200 water-management decisions. This project was a cooperative study area consisting of the NPNRD, SPNRD, and TPNRD (figs. 2 and 3). 4,500 4,350 4,600 4,500 4,550 4,550 4,350 3,700 3,850 3,200–3,250, 3,450–3,500, 3,700–3,750, 3,950–4,000, 4,200 –4,250, involving the North Platte Natural Resources District, the South The interpretations presented in this report build on previous work 4,000 3,850 3,900 4,450–4,500, 4,700–4,750, 4,950–5,000, 5,200–5,250 Platte Natural Resources District, the Twin Platte Natural Resources (Abraham and others, 2012) by including AEM survey data collected 4,600 4,100 3,750 3,950 4,150 3,800 3,250–3,300, 3,500–3,550, 3,750–3,800, 4,000–4,050, 4,250–4,300, 4,500 4,400 District, the Conservation and Survey Division of the University of in 2010 (U.S. Geological Survey Crustal Geophysics and Geochem- 4,550 4,300 3,950 4,500–4,550, 4,750–4,800, 5,000–5,050, 5,250–5,300 4,550 4,000 3,950 3,900 6,4 4,050 4,350 4,450 4,600 3,700 Nebraska-Lincoln, and the Nebraska Environmental Trust. 4,500 4,600 4,700 5 4,250 4,200 4,300 3,300–3,350, 3,550–3,600, 3,800–3,850, 4,050–4,100, 4,300–4,350, istry Science Center, 2014), and lithologic descriptions and borehole 0 4,150 4,400 4,100 3,600 3,700 4,450 4,000 3,600 4,550–4,600, 4,800–4,850, 5,050–5,100, 5,300–5,350 4,150 3,950 This report presents the interpreted base-of-aquifer surface for geophysical logs from additional test holes provided by separate 4,050 3,650 Tributary of Bayard Drain 4,250 4,300 3,650 3,650 part of the area consisting of the North Platte Natural Resources Dis- but related studies (James C. Cannia, U.S Geological Survey, writ- 4,450 4,100 3,700 4,250 4,300 4,200 3,700 North Platte Natural Resources District airborne electro- 4,500 3,750 3,900 trict, the South Platte Natural Resources District, and the Twin Platte ten commun., 2012; Hobza and Sibray, 2014; T.A.