The Illinois Tollway originally planned to begin reconstruction of the I-90 bridge over the Fox River this spring, but that plan for the $75 million project is being put on hold to allow the fish in that section of the river to finish spawning, according to the Chicago Tribune.
The Fox River near Elgin, Ill., does not harbor any endangered or threatened species but is home to smallmouth and largemouth bass, channel catfish, walleye, bluegill, muskie and pike.