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
Science and Products
Brine contamination of freshwater aquifers and streams in petroleum producing areas in Mississippi
Background hydrologic information in potential lignite mining areas in north-central Mississippi, August 1984
Background hydrologic information in potential lignite mining areas in northeastern Mississippi
Background hydrologic information in potential lignite mining areas in Mississippi, July 1982
Quality of water in Luxapallia Creek at Columbus, Mississippi
Quality of water and time of travel in Bakers Creek near Clinton, Mississippi
Specific conductance and dissolved chloride concentrations of freshwater aquifers and streams in petroleum producing areas in Mississippi
Quality of water in the Tallahatchie River near New Albany, Mississippi
Quality of water and time of travel in Goodwater and Okatoma Creeks near Magee, Mississippi
Quality of water and time of travel in Little Copiah Creek near Crystal Springs, Mississippi
Quality of water in Tibbee Creek and tributaries near West Point, Mississippi
Science and Products
- Science
- Data
- Publications
Filter Total Items: 71
Brine contamination of freshwater aquifers and streams in petroleum producing areas in Mississippi
No abstract available.AuthorsS. J. KalkhoffBackground hydrologic information in potential lignite mining areas in north-central Mississippi, August 1984
The U.S. Geological Survey, in cooperation with the Mississippi Department of Natural Resources, Bureau of Geology, is conducting a hydrologic data collection program in potential lignite-producing areas in Mississippi. During the last two weeks of August 1984, hydrologic data were collected at 15 stream sites that drain potential lignite mining areas in Lafayette, Calhoun, and Yalobusha Counties.AuthorsS. J. KalkhoffBackground hydrologic information in potential lignite mining areas in northeastern Mississippi
No abstract available.AuthorsS. J. KalkhoffBackground hydrologic information in potential lignite mining areas in Mississippi, July 1982
A water-quality sampling program was initiated in 1980 to determine background hydrologic data in potential lignite mining areas of Mississippi. This report is the third in a planned five-part series to provide data to assess future impacts of mining on small streams. The data indicates that most streams in the study area have a dissolved-solids concentration less than 100 mg/. The major ion conceAuthorsStephen J. KalkhoffQuality of water in Luxapallia Creek at Columbus, Mississippi
A quality-of-water study was conducted on September 9-12, 1979, on Luxapallila Creek and its tributaries, Magby and McCrary Creeks. The short term study indicated that the water in Luxapallila, Magby, and McCrary Creeks is suitable for many purposes.The dissolved-oxygen concentration, temperature, and pH of the water in Luxapallila Creek changed little downstream from site 1 to site 5. The mean spAuthorsStephen J. KalkhoffQuality of water and time of travel in Bakers Creek near Clinton, Mississippi
A short-term intensive quality-of-water study was conducted during a period of generally low streamflow in Bakers Creek and its tributary, Lindsey Creek, near Clinton, Mississippi.During the September 15-18, 1980 study, dissolved oxygen concentrations in Bakers Creek were less than 5 milligrams per liter. The specific conductance, 5-day biochemical oxygen demand, nutrient concentrations, and bacteAuthorsStephen J. KalkhoffSpecific conductance and dissolved chloride concentrations of freshwater aquifers and streams in petroleum producing areas in Mississippi
Specific conductance and dissolved chloride reconnasissance sampling was conducted in six oil-producing areas of Mississippi during periods of low streamflow in 1980 and 1981. Water samples were collected at 224 ground-water and 190 suface-water sites. Samples from 55 surface-water and 17 ground-water sites contained dissolved chloride concentrations in excess of 100 milligrams per liter. All dataAuthorsS. J. KalkhoffQuality of water in the Tallahatchie River near New Albany, Mississippi
The quality of water in the Tallahatchie River was somewhat affected by municipal wastes as it flowed through a 5-mile stretch near New Albany, Miss. Specific conductance, biochemical oxygen demand, nitrogen and phosphorus concentrations, and densities of bacteria in the river increased in a downstream direction. At site 1 (upstream) the mean concentration of total nitrogen was 0.28 milligram perAuthorsStephen J. KalkhoffQuality of water and time of travel in Goodwater and Okatoma Creeks near Magee, Mississippi
An intensive quality-of-water study was conducted during a period of generally low streamflow in Goodwater and Okatoma Creeks near Magee, Miss. During the August 12-14, 1980, study, the mean specific conductance of the water at all sites was less than 59 micromhos per centimeter; the dissolved-oxygen concentrations were greater than 5.0 milligrams per liter: pH values ranged from 6.0 to 6.8, and tAuthorsStephen J. KalkhoffQuality of water and time of travel in Little Copiah Creek near Crystal Springs, Mississippi
An intensive quality of water study was conducted on Little Copiah Creek in the vicinity of Crystal Springs, Miss., from August 19 to August 21, 1980. The quality of water in Little Copiah Creek improved 7 miles downstream of a source of wastewater inflow. The mean total nitrogen concentration decreased from 17 to 1.1 milligrams per liter and the mean total phosphorus concentrations decreased fromAuthorsS. J. KalkhoffQuality of water in Tibbee Creek and tributaries near West Point, Mississippi
An intensive water-quality study was conducted on Tibbee Creek and two of its tributaries, Town Creek and Catalpa Creek, on June 19-22, 1979. The data were collected during a period of low discharge and high air temperatures. The water in Tibbee Creek and Catalpa Creek was of much better quality than water in Town Creek. Large quantities of nitrogen, phosphorus, and dissolved solids and high densiAuthorsStephen J. Kalkhoff