1. REFERENCES
Clark, C., Liu, H., Kerr, P., Tassier-Surine, S., Rowden, R., Streeter, M., 2015, Bedrock Geology of the
New Haven 7.5’ Quadrangle, Mitchell County, Iowa: Iowa Geological Survey, IIHR-Hydroscience &
Engineering, University of Iowa, supported in part by the U.S. Geological Survey Cooperative
Agreement Number G14AC00229, Open File Map 15-3.
Gannon, J. M., Witzke, B. J., Bunker, B., Howes, M., Rowden, R. D., Anderson, R. R., 2008,
Groundwater Availability Modeling of the Lower Dakota Aquifer in Northwest Iowa: Iowa
Department of Natural Resources, Iowa Geological and Water Survey, Water Resources Investigation
1A, 166 p., 63 figs., 9 tables.
Hallberg, G.R., Libra, R.D., Zhi-jun Liu, Rowden, R.D., and Rex, K.D., 1993, Watershed-scale water-
quality response to changes in landuse and nitrogen management: Proceedings, Agricultural Research
to Protect Water Quality, Soil and Water Conservation Society, Ankeny, IA, p. 80-84.
Libra, R.D., Hallberg, G.R., Littke, J.P., Nations, B.K., Quade, D.J., and Rowden, R.D., 1991,
Groundwater monitoring in the Big Spring basin 1988-1989: a summary review: Iowa Department of
Natural Resources, Geological Survey Bureau, Technical Information Series 21, 29 p.
Libra, R.D., Hallberg, G.R., Rowden, R.D., and Bettis, E.A. III, Kalkhoff, S.J., and Baker, D.G., 1992,
Environmental geology of the Big Spring groundwater basin, northeast Iowa: Iowa Department of
Natural Resources, Geological Survey Bureau, Guidebook Series no. 15, 51 p.
Liu, H., Rowden, R.D., and Libra, R.D., 1997, Groundwater monitoring in the Big Spring basin 1994-
1995: a summary review: Iowa Department of Natural Resources, Geological Survey Bureau,
Technical Information Series 37, 45 p.
Liu, H., Rowden, R.D., and Libra, R.D., 2000, Groundwater and surface water monitoring in the Big
Spring basin 1996-1999: a summary review: Iowa Department of Natural Resources, Geological
Survey Bureau, Technical Information Series 44, 121 p.
Liu, H., McKay, R., Tassier-Surine, S., Giglierano, J., Rowden, R., 2009, Bedrock Geology of the
Davenport East 7.5’ Quadrangle, Scott County, Iowa: Iowa Department of Natural Resources, Iowa
Geological and Water Survey, supported in part by the U.S. Geological Survey Cooperative Agreement
Number 08HQAG0082, Open File Map 90-4.
Liu, H., McKay, R., Rowden, R. Clark, C., Tassier-Surine, S., Quade, D., Galer, R., Streeter, M., 2014,
Bedrock Geology of the Mason City 7.5’ Quadrangle, Cero Gordo County, Iowa: Iowa Geological
Survey, IIHR-Hydroscience & Engineering, University of Iowa, supported in part by the U.S.
Geological Survey Cooperative Agreement Number G13AC00175, Open File Map 14-1.
Liu, H., McKay, R., Rowden, R. Clark, C., Tassier-Surine, S., Quade, D., Galer, R., Streeter, M., 2014,
Bedrock Geology of the Nora Springs 7.5’ Quadrangle, Cero Gordo, Mitchell and Floyd Counties,
Iowa: Iowa Geological Survey, IIHR-Hydroscience & Engineering, University of Iowa, supported in
part by the U.S. Geological Survey Cooperative Agreement Number G13AC00175, Open File Map 14-
3.
Liu, H., Clark, R., Fields, C., McKay, R., Rowden, Tassier-Surine, S., Kerr, P., Streeter, M., 2015,
Bedrock Geology of Cerro Gordo County, Iowa: Iowa Geological Survey, IIHR-Hydroscience &
Engineering, University of Iowa, supported in part by the U.S. Geological Survey Cooperative
Agreement Number G14AC00229, Open File Map 15-1.
Rowden, R.D., and Libra, R.D., 1990, Hydrogeologic observations from bedrock monitoring well nests in
the Big Spring basin: Iowa Department of Natural Resources, Geological Survey Bureau, Open-File
Report 90-1, 27 p.

2. Rowden, R.D., Libra, R.D., Hallberg, G.R., and Nations, B.K., 1993, Groundwater monitoring in the Big
Spring basin 1990-1991: a summary review: Iowa Department of Natural Resources, Geological
Survey Bureau, Technical Information Series 27, 36 p.
Rowden, R.D., Hallberg, G.R. and Libra, R.D., 1993, Temporal trends in groundwater quality of the Big
Spring basin 1982-1992: Proceedings, 38th Annual Midwest Ground Water Conference, Abstracts of
Papers, October 6-8, 1993 Champaign, ILL, p. 23.
Rowden, R.D., Libra, R.D., and Hallberg, G.R., 1995, Surface water monitoring in the Big Spring basin
1986-1992: a summary review: Iowa Department of Natural Resources, Geological Survey Bureau,
Technical Information Series 33, 107 p.
Rowden, R.D., 1995, Temporal trends in groundwater quality of the Big Spring basin 1982-1994:
Proceedings, 40th Annual Midwest Ground Water Conference, Abstracts of Papers, October 16-18,
1995 Columbia, MO, p. 50.
Rowden, R.D., Libra, R.D., Hallberg, G.R., and Nations, B.K., 1995, Groundwater monitoring in the Big
Spring basin 1992-1993: a summary review: Iowa Department of Natural Resources, Geological
Survey Bureau, Technical Information Series 34, 43 p.
Rowden, R.D., and Libra, R.D., 1996, Groundwater quality and agriculture: results from the Big Spring
basin: Proceedings, Agriculture and Environment; Building Local Partnerships, January 16-18, 1996
Ames, IA, p. 5-39 to 5-50.
Rowden, R.D., Libra, R.D., and Liu, H., 1998, Shallow groundwater and surface water monitoring of the
Silver Creek sub-basin within the Big Spring basin 1986-1995: a summary review: Iowa Department
of Natural Resources, Geological Survey Bureau, Technical Information Series 38, 94 p.
Rowden, R.D., Libra, R.D. and Liu, H., 2000, Groundwater and surface-water monitoring in the
Bugenhagen sub-basin 1986-1995: a summary review: Iowa Department of Natural Resources,
Geological Survey Bureau, Technical Information Series 41, 150 p.
Rowden, R.D., Libra, R.D. and Liu, H., 2001, Results from the Big Spring basin water quality monitoring
and demonstration projects, Iowa, USA: Hydrogeology Journal, v. 9, no. 5, p. 487-497.
Rowden, R.D., Thompson, C.A. and Jones, M.C., 2000, Water level monitoring of an existing wetland
and a restored wetland at Camp Dodge 1996-1999: a summary review: Iowa Department of Natural
Resources, Geological Survey Bureau, Technical Information Series 43, 64 p.
Rowden, R.D., 2008, Groundwater Resource Evaluation of the Lower Dakota Aquifer in Northwest Iowa:
Iowa Department of Natural Resources, Iowa Geological and Water Survey, Water Resource
Investigation 1B, 27 p., 17 figs.
Rowden, R.D., 2008, Groundwater Quality Evaluation of the Dakota Aquifer in Northwest Iowa: Iowa
Department of Natural Resources, Iowa Geological and Water Survey, Water Resource Investigation
1C, 47 p., 21 figs., 1 table.
Rowden, R.D., 2009, Geology of the Lower Dakota Aquifer of Iowa: Iowa Department of Natural
Resources, Iowa Geological and Water Survey, Miscellaneous Map Series 11-1, 1 color sheet (sheet 1
of 4) with text.
Rowden, R.D., 2009, Hydrology of the Lower Dakota Aquifer of Iowa: Iowa Department of Natural
Resources, Iowa Geological and Water Survey, Miscellaneous Map Series 11-2, 1 color sheet (sheet 2
of 4) with text.
Rowden, R.D., 2009, Water Quality of the Dakota Aquifer of Iowa: Iowa Department of Natural
Resources, Iowa Geological and Water Survey, Miscellaneous Map Series 11-3, 2 color sheets (sheets
3 and 4 of 4) with text.

3. Rowden, R.D., 2010, The Iowa State-Wide Trace Element Soil Sampling Project: Design and
Implementation: Iowa Department of Natural Resources, Iowa Geological and Water Survey, Open
File Report 10-1, 65 p., 59 figs., 3 tables.
Rowden, R., McKay, R.M., Liu, H., Tassier-Surine, S., Quade, D., and Giglierano, J.D., 2011: Bedrock
Geology of the Gilbertville 7.5' Quadrangle, Black Hawk County, Iowa, scale 1:24,000. IGWS Open
File Map OFM-2011-03.
Rowden, R., McKay, R.M., Liu, H., Tassier-Surine, S., Quade, D., and Giglierano, J.D., 2012: Bedrock
Geology of the Cedar Falls 7.5' Quadrangle, Black Hawk County, Iowa, scale 1:24,000. IGWS Open
File Map OFM-2012-04.
Rowden, R., McKay, R.M., Liu, H., Tassier-Surine, S., Quade, D., and Giglierano, J.D., 2012: Bedrock
Geology of Black Hawk County, Iowa. IGWS Open File Map OFM-2013-03.
Rowden, R., McKay, R.M., Clark, R., Liu, H., Tassier-Surine, S., Quade, D., Galer, R., and Streeter, M.,
2014: Bedrock Geology of the St. Ansgar 7.5’ Quadrangle, Mitchell County, Iowa. Iowa Geological
Survey, IIHR-Hydroscience & Engineering, University of Iowa, supported in part by the U.S.
Geological Survey Cooperative Agreement Number G13AC00175, Open File Map 14-5.
Rowden, R., McKay, R.M., Clark, R., Liu, H., Tassier-Surine, S., Quade, D., Galer, R., and Streeter, M.,
2014: Bedrock Geology of the Osage 7.5’ Quadrangle, Mitchell County, Iowa: Iowa Geological
Survey, IIHR-Hydroscience & Engineering, University of Iowa, supported in part by the U.S.
Geological Survey Cooperative Agreement Number G13AC00175, Open File Map 14-7.
Seigley, L.S., Hallberg, G.R., Rowden, R.D., Libra, R.D., Giglierano, J.D., Quade, D.J., and Mann, K.
1993, Agricultural landuse and nitrate cycling in surface water in northeast Iowa: Proceedings,
Agricultural Research to Protect Water Quality, Soil and Water Conservation Society, Ankeny, IA, p.
85-88.
Tassier-Surine, S., Quade, D., Streeter, M., Kerr, P., Rowden, R., McKay, R., Liu, H., Clark, C., Galer,
R., 2014: Surficial Geology of the Mason City 7.5’ Quadrangle, Cero Gordo County, Iowa: Iowa
Geological Survey, IIHR-Hydroscience & Engineering, University of Iowa, supported in part by the
U.S. Geological Survey Cooperative Agreement Number G13AC00175, Open File Map 14-2.
Tassier-Surine, S., Quade, D., Streeter, M., Kerr, P., Rowden, R., McKay, R., Liu, H., Clark, C., Galer,
R., 2014: Surficial Geology of the Nora Springs 7.5’ Quadrangle, Cero Gordo, Mitchell and Floyd
Counties, Iowa: Iowa Geological Survey, IIHR-Hydroscience & Engineering, University of Iowa,
supported in part by the U.S. Geological Survey Cooperative Agreement Number G13AC00175, Open
File Map 14-4.
Tassier-Surine, S., Quade, D., Streeter, M., Kerr, P., Rowden, R., McKay, R., Liu, H., Clark, C., Galer,
R., 2014: Surficial Bedrock Geology of the St. Ansgar 7.5’ Quadrangle, Mitchell County, Iowa. Iowa
Geological Survey, IIHR-Hydroscience & Engineering, University of Iowa, supported in part by the
U.S. Geological Survey Cooperative Agreement Number G13AC00175, Open File Map 14-6.
Tassier-Surine, S., Quade, D., Streeter, M., Kerr, P., Rowden, R., McKay, R., Liu, H., Clark, C., Galer,
R., 2014: Surficial Geology of the Osage 7.5’ Quadrangle, Mitchell County, Iowa: Iowa Geological
Survey, IIHR-Hydroscience & Engineering, University of Iowa, supported in part by the U.S.
Geological Survey Cooperative Agreement Number G13AC00175, Open File Map 14-8.
Tassier-Surine, S., Quade, D., Streeter, M., Liu, H., Clark, C., Fields, C., McKay, R., Rowden, 2015:
Surficial Geology of Cerro Gordo County, Iowa: Iowa Geological Survey, IIHR-Hydroscience &
Engineering, University of Iowa, supported in part by the U.S. Geological Survey Cooperative
Agreement Number G14AC00229, Open File Map 15-2.

4. Zhang, You-Kuan, Bai, Er-Wei, Libra, Robert, Rowden, Robert, and Liu, Huaibai, 1996, Simulation of
Spring discharge from a limestone aquifer in Iowa, USA: Hydrogeology Journal, v. 4, no. 4, p. 42-55.