Colorado ·
New Mexico ·
Rio Grande Fly Fishing Report - October 18, 2026

RIO GRANDE
ReportOCT 18 — 25, 2026
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Flow
52CFS
RIO GRANDE NEAR CERRO, NM
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Water Temp
—
Updated 2026-10-17
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Weather
30–66°F
Partly Cloudy
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Clarity
Clear
Check post-storm
Flow is running at 52 CFS with a gauge height of 1.32 ft at Cerro — gin-clear, low water that demands long, fine leaders and stealthy approaches. BWO and Autumn Caddis hatches are active with overnight lows near 30°F pushing insect activity into the warmest midday hours.
What's Working — Hot Flies

Parachute - Blue Wing Olive #22
#22

Juju Baetis Tungsten #22
#22
Barr's Flashback Emerger - BWO #22
#22

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

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

Black Zebra Midge(TBH) #20
#20

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

Top Secret Baetis #16
#16

Egan's CDC Rainbow Warrior #22
#22

Bionic Ant 2.0 - Black #16
#16

Roza's World Spain Perdigon Barbless #18 - 32
#18
Lil Bit Craven - Dark Olive #22
#22
Hatch Chart
| Insect | Size | Activity | Prime Time |
|---|---|---|---|
| Blue-Winged Olive (Baetis) | 20-22 | Heavy | 11 AM - 3 PM |
| Autumn Caddis | 16-18 | Moderate | 1 PM - 4 PM |
| Midge | 20-24 | Moderate | 9 AM - 12 PM |
| Pale Morning Dun | 18-20 | Light | 11 AM - 1 PM |
| Terrestrials (Ants) | 16 | Light | 12 PM - 3 PM |
Best Time Window
- 9 AM - 11 AM: Midge activity in the tailouts and glassy flats before air temps warm — nymph deep and slow.
- 11 AM - 3 PM: Prime BWO hatch window with mostly sunny skies and temps climbing to 66°F — best dry fly opportunity of the day.
- 1 PM - 4 PM: Autumn Caddis adults on the water along the banks — work the slower water and cut banks with a CDC caddis pattern.
Guide's Tip
From the benchAt 52 CFS the Rio Grande is running low and crystal clear, so stealth is everything — approach all runs from downstream, stay low, and keep false casts to a minimum. Set up a 12-14 foot leader with 6X tippet and position your indicator so your nymph is ticking the bottom at 1-2 feet of depth through the deeper slots. During the BWO hatch window (11 AM to 3 PM), switch to a dry fly and target the flat water just below the riffles where trout will be sipping in the surface film — look for subtle nose-up rises and present upstream of the fish with a reach cast to eliminate drag. If you spook a run, move on and come back — these fish will settle back into feeding position within 20 minutes.
Main Species
Brown Trout
Rainbow Trout
Rio Grande Cutthroat Trout
