- The Chimehuin river begins at the Huechulaufquen Lake with its famous mouth, which is well known for its many trophy fish, near the base of the LanĂn Volcano. It runs for more than 40 miles until the confluence with the Collon Cura river. The river divides into the upper and lower sections; the lower Chimehuin is the most productive water to fish with some of the best mayfly and caddis hatches you can get. Willow-banks, riffles, and drop offs create great fishing conditions. The river fishes very well with every technique - dry fly, nymphing and streamers. You can fish this river from Estancia Tipiliuke, a five star fishing lodge, or you can do an overnight as well.