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Mayfly Watch Navigation Pool Maps

We are looking for observers to report when they see mayflies at different areas along the Upper Mississippi River. The Mississippi river is often referred to by navigation pools. The navigation pool number is determined by the Lock and Dam. If you look upstream from Lock and Dam 4 the navigation pool is 4, downstream the navigation pool is 5.

Learn more about Mayfly Watch.

An overview of the Pools: 

Another view of Pools 4-14, which lie within the Upper Mississippi River NWFR:

Close-ups of the Pools: