Colorado ·
Blue River Fly Fishing Report - June 21, 2026
BLUE RIVER
ReportJUN 21 — 28, 2026
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Flow
582CFS
BLUE RIVER BELOW GREEN MOUNTAIN RESERVOIR, CO
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Water Temp
—
Updated 2026-06-21
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Weather
41–76°F
Mostly Clear
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Clarity
Clear
Check post-storm
The Blue River below Green Mountain Reservoir is pushing 582 cfs at a gauge height of 4.9 ft — elevated, fast flows that demand you target current seams, eddies, and soft pockets where trout are stacking to avoid the heavy push. Water clarity may be off-color; expect a tight window of productive water and weight your rigs accordingly.
What's Working — Hot Flies
Olsen's Straggle Stone Brown Barbless #12 - 32
#12
Tungsten Pat's Rubber Legs - Tan & Brown #6
#6
Egan's Thread Frenchie Jig - Olive #12
#12
Blowtorch - Hare's Ear #12
#12
Coffey's CH Sparkle Minnow Sculpin #6
#6
Tungsten Jig Bugger - Olive - Barbless #14
#14
Corn-fed Caddis (CDC) Tan #20
#20
Bionic Ant 2.0 - Black #16
#16
Tungsten Split Case Nymph - PMD #20
#20
Juju Baetis Tungsten #22
#22
Parachute - Blue Wing Olive #22
#22
Egan's GTI Caddis - Olive #12
#12
Hatch Chart
| Insect | Size | Activity | Prime Time |
|---|---|---|---|
| Stonefly (Golden) | #8-12 | Moderate | 9 AM - 1 PM |
| Caddis | #16-20 | Moderate | 12 PM - 4 PM |
| PMD (Pale Morning Dun) | #16-20 | Light | 11 AM - 2 PM |
| Blue-Winged Olive (Baetis) | #20-22 | Light | 7 AM - 10 AM |
| Terrestrials (Ants) | #12-16 | Moderate | 1 PM - 5 PM |
Best Time Window
- 6:30 AM - 10 AM: Early nymphing with heavy stonefly and attractor patterns in seams and deep pockets before fishing pressure builds.
- 11 AM - 2 PM: PMD and BWO hatch window — watch slower eddies for rising fish and switch to dry flies or emergers in the tailouts.
- 2 PM - 6 PM: Terrestrial and caddis afternoon session; work grassy banks and foam lines with ant and caddis dries as temperatures peak near 74°F.
Guide's Tip
From the benchWith flows at 582 cfs, the river is running fast and the fish are not in the middle — they're tucked into every soft pocket, eddy, and current seam they can find. Wade to the inside of bends and fish your nymphs tight to the bank at 1.5 to 2 times the depth of the water, using enough split shot to get your fly ticking bottom within the first third of the drift. In the afternoon, switch to a single dry fly and work the foam lines in slower tailouts; fish are less likely to spook from a dry than an indicator in this heavily pressured Gold Medal water, and you'll get more honest looks.
Main Species
Rainbow Trout
Brown Trout
Mountain Whitefish
