2018 Impaired Waters List

2018 Impaired Waters List

The Iowa Department of Natural Resources is seeking public comment on the newly released draft impaired waters list.  Prairie Rivers of Iowa will be recommending that Squaw Creek and East Indian Creek be added to "Waters in Need of Further Investigation."  We'll also take this opportunity to try to demystify a topic that can be confusing, using examples from the South Skunk River watershed. Every two years, the DNR is required to assess the available data to determine whether Iowa's lakes, rivers, and wetlands are meeting their designated uses.  About half the rivers, and a bit more of the lakes have enough data to assess.  Since new waters are considered each cycle, the length of the impaired waters list doesn't really tell us whether water quality is getting worse.  Since nutrients aren't considered for most uses and the data used for the 2018 assessment is from 2014-2016, it doesn't tell us whether the Iowa Nutrient Reduction Strategy is working.  What it...
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Watershed Matchup #4: Upper Squaw Creek vs. Lower Squaw Creek

Watershed Matchup #4: Upper Squaw Creek vs. Lower Squaw Creek

This post is part of a series for 2019 Watershed Awareness Month, comparing water quality in a pair of local creeks to learn how land and people influence water. On May 20, the Skunk River Paddlers launched their canoes and kayaks on Squaw Creek at 100th Street in Hamilton County and paddled down to 140th St in Boone County.  The recent rains made it a fast ride! However, the rain also washed a lot of sediment and quite likely some land-applied manure into the stream.  I collected a water sample just before I took this photo and had a lab test it for E. coli bacteria, an indicator of fecal contamination: 2,390 CFU (Colony Forming Units)/100mL.  That’s 10 times the primary contact standard for a single sample (235 CFU/100mL) and just shy of the secondary contact standard (2880 CFU/100mL). Later that day, I collected a sample from Brookside Park in Ames with the help of my son.  The lab results came back at...
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