I-90 Pre-construction Surveys




In 2012 we sampled for reptiles, amphibians, mollusks, and fish at 14 stream crossings along I-90 from IL 47 to the Kishwaukee River.






For reptiles and amphibians we used visual encounter surveys, dip nets, minnow traps, and baited hoop traps, and found 6 species


For mollusks, we sampled four streams and found

  • 203 mollusks representing 19 species (18 mussel and 1 snail species).
  • Two state listed species 
    • Slippershell, Alasmidonta viridis, in Mosquito Creek and
    • Black Sandshell, Liguma recta, in the Kishwaukee River.
  • The two most abundant species were the
    • Mucket, Actinonais ligamentia, and 
    • Plain Pocketbook, Lampsillis carium.


Surveying for fish using minnow seines and backpack shockers we found

  • 2,970 fish representing 49 species.
  • Two state listed species
    • Gravel Chub, Erimystax x-puncttus, in the Kishwaukee River.
    • Iowa Darter, Etheostoma exile, at four sites
  • The four most abundant species overall were the

  • Sand Shiner, Notropis stramineus,
  • Bigmouth Shiner, N. dorsalis,
  • Bluntnose Minnow, Pimephales notatus, and
  • Book Stickleback, Culea inconstans.  


The three most abundant species in small streams were the

  • Fathead Minnow, Pimephales promelas,
  • Brook Stickleback, Culaea inconstans, and
  • Black Bullhead, Ameiurus melas.


 The three most abundant species in large streams were the

  • Sand Shiner, Notropis stramineus,
  • Bigmouth Shiner, N. dorsalis, and
  • Bluntnose Minnow, Pimephales notatus.



We surveyed these same areas in 2015, post-construction.