Impaired Water Assessment
Rivers Management Grant
This project proposes to monitor and assess the impacts of point and non-point discharges to the Grand River and determine if the river meets the criteria for 2016 impaired waters listing. Samples collected in 2012 for WPDES phosphorus limits calculations (Project Id WCR_13_CMP13), and historic water quality data, indicates that Total Phosphorous (TP) well exceeds the listing threshold of 0.075 mg/L upstream of the Grand River Marsh. Samples were found to contain concentrations of TP between 0.1 to 0.9 mg/L. Historical TP data for the stretch of stream below the Grand River Marsh and upstream of the Fox River were found to have lower concentrations, 0.049 and 0.077 mg/L, and impairment is not as likely. Water quality samples and biological assessments will be accomplished, for both stretches of stream, to complete WisCALM requirements for impaired water identification.