^Eastbound trailblazer at Illinois 84 in Fulton, June 2020.
Illinois Route 136 is a tiny east-west route that simply serves as a connector to Iowa Route 136, in the Clinton, Iowa, area. Specifically, you can find this route in western Whiteside County.
Illinois 136's western endpoint is the bridge over the Mississippi River, on the south side of Clinton, Iowa. This picture below is the first eastbound reassurance marker: