Colorado River Fly Fishing report

Colorado River Fly Fishing report

Colorado River Fly Fishing Report

May 1, 2025.    CFS:886 (Kremmling)

Colorado River Fly Fishing Report – Kremmling, Colorado (May Edition)

As spring gives way to early summer, the Colorado River near Kremmling, Colorado, comes alive with promising fly fishing opportunities. Known for its productive riffles, deep pools, and scenic canyon stretches, this section of the river is a favorite among anglers—especially in May, when runoff, hatches, and fish activity are in constant transition.

River Conditions in May

May on the Colorado River near Kremmling marks the beginning of runoff season. Snowmelt from the high country begins to swell the river, leading to higher flows, cooler water temperatures, and varying clarity. Expect fluctuating conditions, especially after warm afternoons or rainstorms. Despite this, the river can still fish very well—particularly during early morning and late afternoon lulls in runoff.

  • Water Clarity: Varies daily. Expect stained water after warm spells, but mornings can bring clearer conditions.

  • Flows: Typically range from 1,200 to 3,000 CFS. Check the latest readings via the USGS streamflow gauge for Kremmling.

  • Water Temperature: Mid-40s to low 50s°F, depending on time of day and proximity to tributaries.

 

Top Fly Patterns for May

With both subsurface and surface action possible, it's best to bring a diverse selection of flies to match the changing conditions.

Nymphs (Workhorse for May)

  • Pats Rubber Legs (Stonefly imitation) – Size 8–10

  • San Juan Worms – Size 10–14 (especially effective in murky water)

  • Prince Nymphs – Size 12–16 *we love purple psycho prince nymphs

  • Flashback Pheasant Tails – Size 14–18

  • Baetis (BWO) Nymphs – Size 18–20 *Radiation baetis, purple juju

Dry Flies (For Evening and Calm Conditions)

  • Blue-Winged Olive (BWO) – Size 18–20

  • Parachute Adams – Size 16–20

  • Griffith’s Gnat – Size 18–22 (on calm days)

  • Elk Hair Caddis – Size 14–18 (late May emergence)

Streamers (For Aggressive Strikes in Murky Water)

  • Sculpzillas – Olive or Black

  • Thin Mints – Size 6–10

  • Swim Coach, Gongas, Sex Dungeons, Dirty HIppy

Tips for Success

  • Fish the edges: During high flows, trout often hold along banks, in soft seams, or behind structure. Don't wade too far.

  • Use weight: In stained or fast water, get your nymphs down quickly. Use split shot or heavier tungsten flies to reach the strike zone.

  • Adjust your rig: Start with a two-fly nymph rig under an indicator. Switch to dries if you see consistent surface activity, especially in the evenings.

  • Use fluorocarbon: Lower visibility leaders and tippet can help fool picky fish in clearer water pockets.

  • Check flows daily: Runoff varies widely. A sudden jump in CFS could indicate tough conditions, so plan your day accordingly.

Local Insight

The stretch between Pumphouse and Radium remains a popular float, with accessible wade fishing along the banks. For more solitude, head toward Gore Canyon.

Final Thoughts

May fly fishing on the Colorado River is a blend of challenge and reward. With the right flies, timing, and flexibility, you can hook into quality browns and rainbows even as runoff begins to surge. Don’t forget your wading staff and polarized glasses—both will help you navigate spring conditions safely and effectively.

 

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