Big Thompson River Report
Latest Update: 5/23/2025
Current Streamflow : 160 @ Big T Above Lake Estes, 125 cfs @ Big T Below Lake Estes, 82 cfs @ Moraine Park
Spring Fishing Update: Big Thompson
The Big Thompson had a slight bump in flow under the dam this week. But has stayed fairly consistent and clear. For the nymphing game we like Two Bit Hookers, RS2's, Zebra Midges, and Rainbow Warriors in size #16-20. As you work closer to the dam sow bugs, small worms, and leeches can play a big role in your success in getting fish to eat (remember to get the depth and drift right!) This time of year brings hatches, and happy feeding so stay armed with some dry imitations. As long as you have flies like the Stillborn Midge, Mole Fly, Sprout BWO, and Sparkle Flag Blue Wing Olive in #18-22's. With Lake Estes filling above we will see the Big T get up to ~600 cfs through runoff, so be prepared to change it up as you see fit. As always give us a call or stop in for more info!
Recommended Big Thompson Flies:
Dry Flies
- Winger Parachute BWO #18
- Parachute Adams #18-20
- Parachute Adams #18-20
- Sprout Midge #18-22
- Griffiths Gnat #20-22
- Sparkle Flag BWO #18-20
Nymphs
- Zebra Midge #18-20
- Sparkle Wing RS2 #18-22
- Radiation Baetis #18-20
- Mercury FB Pheasant Tail #18-20
- Flossy Worm #16
- Sniper Baetis #18-20
- Split Back Shady BWO #20-22
- Tan Sow Bug #16-18
Streamers
- Thin Mint #8-12
- Meyer's Mini Leech #14
- Hot Head Leech #10
- Black Wooly Bugger #08
- Slumpbuster #06
We've been having a great time on the Big Thompson this year! If you have any questions about guide trips please contact us at 970-498-8968 or click here to book your trip now.