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Last modified
11/23/2009 10:51:30 AM
Creation date
10/4/2006 9:42:43 PM
Metadata
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Template:
Floodplain Documents
County
Statewide
Community
Pipestone Minnesota
Title
Problem Identification Report and Appendixes at Pipestone Minnesota
Date
4/1/1995
Prepared By
Greenhorne & O'Mara, Inc.
Floodplain - Doc Type
Project
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />County, only drained areas of Lamoure silty clay loam are considered prime farmland (SCS, <br />1994). <br /> <br />Main Ditch A is shown on the NWI map as a riverine system and may be considered a <br />jurisdictional ditch. The NPS, in coordination with the Pipestone Soil and Water Conservation <br />District, conducted water quality tests along the Main Ditch upstream of Winnewassa Falls. Tests <br />were conducted in 1993 and 1994, and were not related to flood events. Iron, nitrates, and fecal <br />colifonn levels were found to be very high (pers. comm., National Park Service). Feedlot runoff <br />is a problem in the area, as is sewage runoff during flood events. Following the flood events in <br />1993, mercury and volatile organic compounds were detected at levels below acceptable limits <br />(pers. comm., National Park Service). <br /> <br />There is an old municipal landfill located on city land to the north of the city along Main Ditch, <br />just east of the National Monument. It was reported by the Pipestone City Administrator that the <br />landfill had been closed for approximately 30 years. The landfill was reportedly under water <br />during the flooding events of 1993. According to the NPS, it is suspected that elevated mercury <br />levels could be related to the flooding of the landfill. <br /> <br />According to the DNR, poor water quality in Pipestone Creek appears to be affecting riparian <br />vegetation at the Pipestone National Momunent. Channelization of the Main Ditch has increased <br />sediment load and caused an overall degradation of vegetation within the corridor (pers. comm., <br />National Park Service). Main Ditch is grass lined and little volunteer tree growth occurs. <br /> <br />The Main Ditch riverine system (R30Wx) was the only classification of wetlands identified on <br />the NWI maps or through photointerpretation within the study area (see Figure 3). A field <br />investigation for wetlands was not conducted. <br /> <br />The western prairie fringed orchid (Platanthera praeclara) is a federally-listed threatened plant <br />species which may be present in the project area (USFWS). The Natural Heritage Program <br />database of the Minnesota DNR indicates that these flowering plants have been observed within <br />the Pipestone National Monument. Candidate species (Category 1) for federal listing identified <br />within Pipestone County include the Dakota skipper butterfly illespera dacotae). loggerhead <br />shrike (Lanius ludovicianus), plains topminnow (Fundulus sciadicus), and the Topeka shiner <br />(Notropis tristis-tqpeka>' Topeka shiners were documented within Pipestone Creek in 1989 (pers. <br />comm., National Park Service). <br /> <br />Channelization of Main Ditch eliminated secondary channels and increased flooding within the <br />National Monument. This increase in flooding reportedly created smaIl wet areas within the <br />Monument. The western prairie fringed orchid bas been identified in these areas of the park. The <br />NPS bas serious concerns regarding any changes in flow in Main Ditch and the potential impacts <br />to the National Monument (pers. corom., National Park Service). <br />
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