Colorado ·
Roaring Fork River Fly Fishing Report - September 20, 2026

ROARING FORK RIVER
ReportSEP 20 — 27, 2026
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Flow
1620CFS
COLORADO RIVER BELOW GLENWOOD SPRINGS, CO
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Water Temp
—
Updated 2026-09-19
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Weather
41–75°F
Slight Chance Rain Showers
💧
Clarity
Clear
Check post-storm
Flow at the Colorado below Glenwood Springs gauge is running 1,620 CFS at 3.97 ft as of last night — up noticeably from the 928 CFS reported earlier this week, so expect slightly off-color water in the lower reaches and concentrate on mid-river seams and softer edges where trout are holding out of the push. Sunny skies and a high of 72°F today will warm things up nicely for afternoon BWO and caddis activity.
What's Working — Hot Flies

Parachute - Blue Wing Olive #22
#22

Juju Baetis Tungsten #22
#22

Top Secret Baetis #16
#16
Barrs Flashback Emerger - BWO #22
#22

Olsen's Hare's Ear Blowtorch Barbless #20 - 28
#20

Roza's World Spain Perdigon Barbless #18 - 32
#18

Corn-fed Caddis (CDC) Tan #20
#20

Corn-fed Caddis (CDC) Olive #20
#20

Black Zebra Midge(TBH) #20
#20

Olsen's Peacock Blowtorch Barbless #22 - 24
#22

Egan's Silver Bullet - Baetis #14
#14

Tungsten Pat's Rubber Legs - Tan & Brown #6
#6
Hatch Chart
| Insect | Size | Activity | Prime Time |
|---|---|---|---|
| Blue-Winged Olive (Baetis) | 20-22 | Heavy | 11 AM - 3 PM |
| Caddis | 16-18 | Moderate | 3 PM - 6 PM |
| Pale Morning Dun | 16-18 | Light | 10 AM - 1 PM |
| Midge | 20-24 | Moderate | 8 AM - 11 AM |
| Golden Stonefly | 12-14 | Light | 9 AM - 12 PM |
Best Time Window
- 7 AM - 10 AM: Midge and early nymph fishing in slow pools and eddies before the sun hits the water.
- 11 AM - 3 PM: Prime BWO hatch window — watch for rising fish in tailouts and flat water, switch to dry flies when you see consistent surface activity.
- 3 PM - 6 PM: Afternoon caddis activity along the banks; also a great time to swing a soft hackle or CDC caddis through the riffles as light drops.
Guide's Tip
From the benchWith flows up to 1,620 CFS, skip the middle of the river and work the soft seams along the banks and behind any large boulders — that's where trout are holding to avoid the push. During the BWO hatch window (roughly 11 AM to 3 PM), look for rising fish in the slower tailouts and flat water below riffles; position yourself downstream and cast upstream with a long, fine tippet to get a clean drag-free drift. If you're not seeing surface activity, run a heavy tungsten nymph tight to the bottom in the 2-4 foot depth range along current breaks — the elevated flow is concentrating fish in predictable lies and they're actively feeding to fuel up for fall.
Main Species
Brown Trout
Rainbow Trout
Mountain Whitefish
