Watershed Matchup #5: Grant Creek Vs. West Indian Creek

Watershed Matchup #5: Grant Creek Vs. West Indian Creek

GIS mapping is a big part of my job, but I'll be the first to admit there’s a limit to what you  can learn about a stream without getting your feet wet, or at least dipping a bucket into the water. I’ve been testing West Indian Creek and Grant Creek at the lovely Jennett Heritage Area, just above their confluence. (With some help from David Stein and Rick Dietz)  West Indian Creek flows through Nevada and drains 28,417 acres at this point.  Grant Creek, also known as Drainage Ditch 5, drains 13,344 acres between Ames and Nevada. Based on soils and landcover in the watershed, I’d expect Grant Creek to have comparable or slightly worse water quality than West Indian Creek.  There are nutrient loading models available online and in the Story County Watershed Assessment that predict just that. Instead, I’ve found that water quality is consistently better in Grant Creek.  West Indian Creek has normal nitrate levels but very high phosphorus levels. ...
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Watershed Matchup #3: College Creek VS Bluestem Creek

Watershed Matchup #3: College Creek VS Bluestem 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. With such a big watershed—147,000 acres—we’ll need the help of a lot of people to improve water quality in Squaw Creek.  However, some of the people I talk to assume that water quality is mostly someone else’s problem—it’s the CAFOs fault, or the golf courses, or the residential lawns. By comparing smaller streams, volunteer monitoring can help us untangle some of the influences and serve as a reality check on the finger pointing.  Thanks to the Squaw Creek Watershed Coalition we have some data on a lot of Squaw Creek’s tributaries, some with urban watersheds (College Creek) and some with rural watersheds, some with hog barns (Prairie Creek) and some without (Bluestem Creek).  Some streams were even sampled monthly for a few years—not always the same years, but I’ve included some monthly averages...
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