But what if one knew a creek that had reproductive rainbows I’ve been catching them for 20 years any time I want a special lunch no matter the time of year however if it’s summer what you catch you eat because waters cold enough for them to survive but after being caught in august 50% of the time they die within hours so I only target them when I plan to eat. Be real nice if the dnr would protect the creekI believe that there are areas on Rock Creek that may stay cold enough for the entire year. However, from from talking to the IDNR fish biologist I doubt that Rock Creek is capable of supporting a year round trout population. Rock Creek does have a nice population of smallmouth bass and rock bass and catching these in the beautiful surrondings of Rock creek makes for a wonderful experience.
According to the "Fishes of Illinois" the only places where trout (brook and lake trout) occurr naturally is in Lake Michigan. Brook trout (the only native trout in the midwest) are not found on inland streams or lakes. There may have been an occasional stray from streams that are on the border in Wisconsin. Doing habitat improvement on streams that never supported a native trout population is unlikely to make it support a trout population. However, Illinois does have a good number of smaller streams that support smallmouth bass. These fish are really fun fish to catch.
If you want to catch stream trout in illlinois you can fish Rock Creek, Piscasaw Creek, Apple Canyon State Park and whatever other streams the IDNR stocks with trout during the spring season. The stockers are fun, enjoy them.
If you want to fish for native trout you are better off going to to Wisconsin, Michigan, and even Iowa.
Although I love to flyfish for trout, I think massive habitat improvement in Illinois streams so they can support trout will not work. However, the money wouldn't be wasted as I'm sure the carrying capacity of these streams to support smallmouth bass would greatly increase.
To answer your question yes there are trout streams in Illinois however, none of them support a year round trout fishery. Hope this answers your question.