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wells extended 1.8 miles north and 2.9 miles south of the study site, and were constructed of <br />11 /a inch iron pipe. <br />The river stage gaging station was near the southeastern corner of the study site on the <br />South Channel of the Platte River (Figure 4). Additional staff gages were established by the <br />National Audubon Society to help define the surface water slope of the channel, and to monitor <br />surface water levels in three shallow stock ponds on the Sanctuary. <br />Crane Meadows Site <br />The Crane Meadows site (Figure 5) was approximately 6 miles south of Grand Island, <br />Nebraska on a large island in the Platte River. The site was located on the Mormon Island <br />Crane Meadows Wildlife Refuge, which is owned and managed by the Platte River Whooping <br />Crane Habitat Maintenance Trust. This was the wettest of the three sites, and was <br />characterized by a large proportion of low, seasonally flooded wet meadows, with some higher <br />dry meadows, and a tree -lined fringe on the natural levees bordering the river. The refuge is <br />managed for both migratory and resident wildlife. Land management practices included <br />grazing, burning, and haying. <br />The well grid had 25 observation wells. Two additional wells (CM33ABC and <br />CM33ABD) were established on an island directly northwest of the main study site to evaluate <br />the groundwater relationships for this type of drainage pattern. The three side wells <br />(CM26DBB -SW CM34BDD -SW, and CM34CDA SW), and the four Swale and Upland wells <br />were installed for a study by the National Audubon Society, but these data were also used for <br />our analysis. Five piezometer wells in Group 1 were installed for a study by Hurr (1983). <br />Four of these wells were still intact, and were monitored on a monthly basis from April 1991 <br />through the end of the study to investigate vertical groundwater movements. The shallowest <br />piezometer was also included in the grid analysis. Wells along the western side of the grid <br />composed a portion of the cross - valley transect. The cross - valley transect extended 1.6 miles <br />north and 2.2 miles south of the study site (Figure 8). Transect wells were installed by the <br />U.S. Geological Survey (Hurr 1983), and were from 25 to 100 feet deep. All new grid wells <br />IR <br />