Normally the Needhami's, a small chocolate brown Mayfly, would have already started by early July, but they just began in the Catch & Release section this past weekend, with reports of a heavy hatch Saturday. Normal time frame is about 7am to 1pm- first the spinners (normally), then the duns. Size range is typically #22-26. Isonychia are hatching in the faster water, normally from mid-afternoon into the evening This is probably my all-time favorite hatch, it is a big bug (#10-12) that fishes great with dries, nymphs & wets, and it gets big fish feeding on top in the daylight, often in fast, shallow water. Just like with other hatches, warmer days will push things later, and mild/cloudy ones will make things happen earlier. - Torrey
The river is 318cfs from the dam in Riverton, 362cfs through the Catch & Release area- this is an excellent, medium level. Water temps have been cool, enabling you to fish from the dam all the way down to Unionville. Depending upon distance from dam, time of day and daily weather, water temps have been running upper 40's to low/mid 60's. Winter/Summer Caddis #18-22 have been a moderate hatch early morning to 11am, with adults on the water in the late afternoon and evening. Blue Wing Olives (BWOs) have been a major hatch in the evenings, averaging a #18-20, with smaller ones on the water at moments too. Have a #18-20 rusty spinner ready to match the BWO spinners right before dark (unlike the olive duns, the spent adults change to a rusty color). Sulfurs are hatching well upriver, but getting lighter as you go downriver. Ants & Beetles are working well during the day. Streamers are effective during low-light conditions (early & late or cloudy/rainy days), play with color, size & presentation for best results. You can also try pounding shady banks with them in the daytime- look for structure where big trout hideout in the daytime, features such as cut banks, downed trees, overhanging limbs, big rocks, etc. - Torrey