Sediment and Nutrients Load Estimation for the Horicon Marsh, Wisconsin
Project Number: 9KP57
Project Chief: Paul Juckem
Project Topics: computation of sediment and nutrients loads
Cooperators: City of Horicon, Wisconsin Department of Natural Resources (WDNR), U.S. Fish and Wildlife Service (USFWS)
Period of Project: 2009 - 2011
Mill Creek, a tributary stream to the Horicon Marsh.
The Horicon Marsh is the largest contiguous wetland in Wisconsin. The issue of sediment and nutrient loading into the marsh has been a topic of concern for many years. The tributaries to the marsh were monitored for Phosphorus and sediment loading from 1997 to 2000. Since then, the WDNR and USFWS have worked with point-source contributors to reduce nutrient discharges into tributary streams. In addition, the WDNR, USFWS, Natural Resources Conservation Service, several county land conservation agencies have also worked to institute extensive agricultural land management improvements throughout the watershed in order to reduce non-point sources of nutrient and sediment loading into tributary streams and the marsh itself.
This project sought to quantify loads of phosphorus and sediment entering and leaving the Horicon Marsh so that future studies could evaluate changes in loads compared withan earlier 1997-2000 study.
The two primary tributaries, the West and East Branches of the Rock River, were monitored; smaller tributaries were evaluated by the cooperators through synoptic measurements. Loads were computed for suspended solids, total phosphorus, and dissolved phosphorus four water years 2010 and 2011. This study did not attempt to evaluate changes compared with the earlier 1997-2000 study; however the cooperators continue to pursue funding opportunities to support the writing of a report that would describe changes in loading and yields between the 1997-2000 study in the 2010-2011 data from this study.
Loads were published annually in USGS Water Data Reports.