The river in Island Park offers great late afternoon fishing during caddis activity. Brown drakes are beginning to show up making evening fishing quite interesting. Double nymph rigs work well in Box Canyon. AM & PM PMD spinner falls bring trout to the surface. Green drake are decreasing, but flavs increasing.
All these insects plus gray drakes are available to fish on the lower river where crowds are thinning a bit because fishing on the South Fork is taking off.
Be aware of the two construction zones on Highway 20 impacting travel to the river and beyond. We have given details on how to avoid hold-ups on the highway climbing Ashton Hill if you intend to fish in Island Park (use the Mesa Falls Scenic Highway). The other significant construction zone on the highway, the re-surfacing of the Lorenzo Bridge across the lower South Fork, impacts travel to the lower and upper river. Here the highway is down to two lanes for about four miles and accommodating the increasing traffic can mean delays of up to twenty minutes until piled-up traffic dissolves. Certainly, try not to be on this part of the highway during “rush hour ” times