Big Thompson River

Latest Guide Report


Report by: Front Range Anglers

Flies used: nymph rigs with blowtorch/larger green copper johns as attractor fly then scud for trailer. Also used jig style zebra midge as a 3rd fly when pocketing deeper pools.

Fishing Conditions: With the cold temps earlier in the morning the trout were in their usual holding spots but once the sun came out and temps rose the fish moved into shallower water, mostly found at the end of pools. Only a few fish were seen rising at that time. Fish were found in deeper pools, along rocks and drops.

Guide: Eric Pennington

Guide Rating
Weather Experienced

Wind Conditions: Gusty
Precipitation: None
Water Observations

Water Temperature: 42
Flow Level: 22 CFS
Runoff? Clear

Big Thompson River Water Flow Graphs

About Big Thompson River Fly Fishing

Starting as a mere trickle on the east side of the Continental Divide, inside Rocky Mountain National Park, the Big Thompson flows from Forest Canyon Pass near the top of Trail Ridge Road through Forest Canyon. As small drainages offer additional snowmelt, the Big Thompson picks up volume, turning into one of Colorado’s finest streams.

The Big Thompson becomes fishable at Moraine Park in Rocky Mountain National Park, about six miles downstream of its headwaters. It’s there at Moraine Park, where the river splits into numerous braids and channels, that fisherman encounter the river’s first public access. Trails leading up and down the river from that point will lead you to great flyfishing experiences.

Moraine is a wide-open area, but the Big Thompson’s banks are lined with willows. It’s typical small stream conditions, and the river is filled with, you guessed it, brook, brown, and cutthroat trout in the 6- to 12-inch range. They’ll readily take a variety of general attractor flies.