The watershed

Hewitt Creek watershed consist of 23,005 acres, with primary land use being agriculture.  The watershed is located in Northeast Iowa outside of Dyersville. The Hewitt Creek Watershed group formed in 2006 when residents were informed of the streams impairment.  With funding from Iowa Farm Bureau and the Iowa Water Improvement fund the council gave incentives for practices targeted at improving water quality.

For more details on the Hewitt Creek Model please visit:


New: End of season cornstalk nitrate sampling video


A brief how-to video on collecting cornstalk samples for end-of-season nitrate nitrogen analysis. Links mentioned in the video:

ISUE publication PM 1584: https://store.extension.iastate.edu/Product/pm-1584

ISU agronomist John Sawyer’s article “Corn stalk nitrate interpretation”: http://www.extension.iastate.edu/CropNews/2010/0914sawyer.htm

The multi-state Sustainable Corn Project: http://www.sustainablecorn.org

Manure spreader calibration video


Determining how much manure is being applied is the first step to efficiently utilizing a valuable on-farm resource. Calculating valuable nutrient credits from solid or semi-solid manure applications will help you to determine how much additional, if any, commercial fertilizer is needed to produce the crop.


Field Day held on cover crops

The Hewitt Creek cover crop field day, hosted by the Iowa Learning Farms and Practical Farmers of Iowa, was moved inside the New Vienna community building due to morning rain showers in the area.

Jack Smith, a Hewitt Creek watershed cooperator, talked about his experiences with cover crops following the field day program.


Wisconsin’s decade of Discovery Farms

For more information on research at the University of Wisconsin and Extension’s Discovery Farms, see Watershed News.

USGS monitoring data available for combined Hewitt, North Fork and Bear Creek watershed

The U.S. Geologic Survey now includes information on the Maquoketa River North Fork on its National Water Information System web interface site.

The USGS monitoring site carries a Hydrologic Unit Code 07060006 and is located at latitude  42°28’14”, longitude  91°07’20” NAD27. Drainage area is 122  square miles.

• Hewitt Creek Watershed map.


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