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Stephen Kalkhoff

Stephen Kalkhoff  is currently a hydrologist with the U.S. Geological Survey, Central Midwest Water Science Center located in Iowa City, Iowa.

Steve has more than 40 years experience with the USGS in Mississippi and Iowa. While in Mississippi, his work involved documenting contamination from oil production and coastal saltwater intrusion due to industrial pumping.  Steve's work in Iowa involved study of the impact of agriculture on surface and ground water in karst areas, impact of agriculture on quality of water in public supply reservoirs, impact of large-scale animal production on water quality, and impact of increased corn production for use by the ethanol industry. His studies have documented the occurrence, transport and in some case trends in nutrients, pesticides, and sediment.

Professional Experience

  • 2015-present Project Chief of a study of spatial and temporal variability of nutrients and pesticides in an alluvial aquifer that is the source of municipal supply

  • 2012-2014 Documented the ability of oxbow wetlands to reduce transport of nutrients from agricultural drainage tiles as Project Chief of US EPA funded project

  • 2011-2012 Documented transport of nutrients during the record 2011 flooding in the Missouri River

  • 2008-2009 Member of team that documented nutrient and sediment transport during record 2008 floods in Eastern Iowa

  • 2004-2008 Project Chief - Transport of nutrients and pesticides from Iowa to the Missouri and Mississippi River study Cooperative Iowa DNR /USGS project

  • 2004-2005 Project Chief USGS, Central Region Integrated Science program (CRISP) Perchlorate reconnaissance of surface and ground water in the United States

  • 2000-2002 Team Member – Heinz Center Report on the State of the Nation’s water resources

  • 1994-2012 Chief of the Eastern Iowa Basins (EIWA) study unit USGS National Water-Quality Assessment program

  • 1986-1994 Project Chief – Big Spring project (study impact of changing land use practices on water quality in an area of karst topography in Iowa) Cooperative Iowa DNR/USGS project

  • 1982-1986 Project Chief – Brine contamination of surface and ground water in Mississippi Cooperative Mississippi DNR/ USGS project

  • 1985 Hydrologist – collected water samples and mapped chloride concentration gradient along Mississippi Gulf Coast to document saltwater intrusion

Education and Certifications

  • Graduate courses, Natural Resources, University of Minnesota,1979

  • B.S. Aquatic Biology--Bemidji State University, Bemidji, MN,1978

  • 1980-1982 Hydrologist – collected water samples and prepared reports for waste assimilation studies in Mississippi

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