MARGINAL
Winter conditions in full effect; Upper Colorado iced up and not fishing, Lower Colorado hit-or-miss with boat access preferred. Flows near Kremmling ~500 CFS, water temps around 42°F. Best window 10am-3pm on sunny days.Colorado River
Current Hatch Activity
Midges are the primary game right now, with hatches from 11am-2pm on sunny days. BWOs are essentially absent until late February. Focus deep nymph rigs in slow pools with Demon Midges, Zebra Midges (#18-22), and Hare's Ears (#12-18). Egg patterns (chartreuse, Oregon cheese) producing in deeper runs. Streamer fishing with Dungeons and Game Changers an option for committed anglers.
MARGINAL
Deep midge nymph rig: #20 Zebra Midge trailing a #18 Demon Midge, dead-drift through slow pools. Add a red worm dropper in off-color water.
Quick Reference
400-1,800 CFS ideal for wade fishing; 1,800-3,000 CFS floatable but challenging wading; above 3,000 CFS most sections unfishable
45-58F optimal; above 65F trout become stressed, especially in lower canyon sections
Peak runoff typically mid-May through late June. Flows stabilize by mid-July most years. Fall drawdowns create consistent wade fishing through October.
Tailwater sections clear first after runoff. Freestone sections need 2-3 weeks post-peak to clear. Afternoon thunderstorms can muddy tributaries and main stem June through August.
What "Fishable" Means Here
Wade fishing productive below 1,500 CFS with visibility of 18 inches or more. Float fishing extends the window to around 2,500 CFS. Water temperatures below 65F recommended for ethical catch-and-release.
Seasonal Patterns
spring
Pre-runoff (March-April) offers good midge and BWO fishing in tailwater sections. Runoff begins mid-May, limiting options to dam-controlled reaches. Stonefly nymphs effective as flows rise.
summer
Post-runoff (mid-July onward) brings prime dry fly fishing. PMDs, caddis, and yellow sallies dominate. Hopper-dropper rigs effective August through September. Fish early or late to avoid afternoon heat in lower sections.
fall
Premier season. Brown trout spawning activity increases aggression. Streamers produce larger fish. BWOs return with cooler temps. Consistent flows and fewer anglers make September-October ideal.
winter
Midge fishing in tailwater sections remains productive. Focus on slower water and deep pools. Shorter windows of activity, typically 10am-3pm. Ice can limit bank access above 8,000 feet elevation.
Alerts
Alternative Waters
Eagle River
Nearby freestone that clears faster; good winter option near VailWilliams Fork River
Smaller tributary with more consistent flows during Colorado River runoffBlue River
Tailwater below Dillon Dam fishes well when Colorado mainstem is blown outRoaring Fork River
Major tributary with different runoff timing; Gold Medal water near BasaltRiver Intel Weekly
Weekly flow updates and fishing intel.
© 2026 RiverReports, Inc.