USGS - science for a changing world

Upper Midwest Environmental Sciences Center

Home/ Overview/ Science Programs/ Data Library/ Products and Publications/States/ Rivers/Teachers and Students/ Links/ Contact/ Search
folder.gifSummary of Monitoring Findings for Fiscal Year 2001
Figures

Figure 12. Since 1996, chlorophyll a (µg/L) concentrations in Pool 26 in summer stratified random sampling show increasing concentrations and higher variability. Increasing Illinois River inputs (green) and incomplete mixing of these inputs contribute to these trends. Concentrations that exceed about 30 µg/L are widely viewed as objectionable algal "blooms."
Chlorophyll-a concentrations (µg/L) in the Mississippi River at northern (A: Pools 4, 8, and 13) and southern (B: Pool 26 and Open River) Long Term Resource Monitoring Program study areas during winter random sampling, 1994

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.umesc.usgs.gov/reports_publications/ltrmp/2001/summary_findings/figure12.html
Page Contact Information: Contacting the Upper Midwest Environmental Sciences Center
Page Last Modified: October 2, 2007