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Sampling Locations in Upper Mississippi River Basin

2017 (approx.)

Detailed Description

Figure 1a. Upper Mississippi River Basin major tributary watersheds and sampling locations for 2015-17 study. Yellow dots mark mainstem Mississippi River, major tributary, and Chippewa River basin sampling sites that were visited quarterly during 2015-17; black dots and red dots mark targeted sampling sites visited one time during 2015-17. Creator: Sydney Foks, USGS, 2017. 


Public Domain.