RIVER REPORT
Big Thompson | Below Lake Estes
The Big Thompson River below Lake Estes in Colorado is a popular tailwater known for its clear, cold waters and excellent trout fishing. Flowing through a picturesque canyon, it offers stunning views and a peaceful setting for anglers and nature lovers alike.
CONDITIONS
Weather & Flow Data Reported From OpenWeather and USGS
Recent Reports
Big Thompson River Below Lake Estes – April Fly Fishing Report: As of early April, the Big Thompson River below Lake Estes is experiencing low and clear flows, typical for this time of year. Anglers can expect hatches of midges and Blue-Winged Olives (BWOs) during warmer midday periods, providing opportunities for both nymphing and dry fly fishing. Effective nymph patterns include Pheasant Tails, Copper Johns, and RS2s in sizes 16–20. For dry fly enthusiasts, BWOs and midge patterns in sizes 18–22 can be productive during active hatches. Additionally, streamer fishing with patterns like Woolly Buggers and Sculpzillas can yield positive results, especially during overcast conditions. Given the river’s clear water and technical nature, employing light tippets (5x to 6x) and a stealthy approach is advisable. Focusing efforts during the warmest parts of the day, typically late morning to early afternoon, can enhance success rates. Overall, the Big Thompson River below Lake Estes offers rewarding opportunities for anglers this April.
Water Flow Data
5 Day Outlook
BUGS
The Big Thompson’s insect life provides a smorgasbord for hungry trout. AvidMax recommends these key fly patterns:
THE FISHERY
The Big Thompson River below Lake Estes offers year-round tailwater fishing with consistent flows and diverse trout populations, making it a prime destination for anglers seeking reliable action in scenic surroundings.
Fish Species
The Big Thompson River below Lake Estes is home to a healthy population of brown and rainbow trout, with occasional cutthroat trout. Trout in this section typically range from 10-16 inches, with some larger fish present, especially closer to the dam where consistent flows and cooler water provide favorable conditions for growth.
Unique Fishing Conditions
This section of the Big Thompson is a tailwater fishery, offering year-round fishing opportunities thanks to the regulated water flows from Lake Estes. Clear water and a mix of riffles, runs, and pocket water create ideal conditions for nymphing. Small midge and blue-winged olive patterns (sizes 18-24) work well throughout the colder months, while caddis and terrestrials such as hoppers and ants are effective in the summer.
Access and Regulations
Public access is abundant along U.S. Highway 34, which parallels the river. However, heavy fishing pressure is common, particularly during weekends and holidays. The section below Lake Estes is regulated as catch-and-release only for rainbow trout, and anglers should practice responsible fishing techniques to preserve the fishery. Be mindful of changing water flows, as releases from the dam can fluctuate, affecting fishing conditions.
TACTICS
AvidMax encourages anglers to explore their full repertoire on the Big Thompson:
Nymphing
Nymphing allows anglers to target trout feeding below the surface, with or without an indicator, making it an effective technique for covering deep runs and slow pools where fish are actively feeding on subsurface insects.
Dry Fly Fishing
Fishing with dry flies provides the ultimate surface experience, imitating adult insects and offering exciting visual strikes, particularly during hatches when trout are feeding on the water’s surface.
Streamer Fishing
Using streamers mimics baitfish and other larger prey, offering an aggressive approach that can entice bigger, predatory trout, especially when fishing deeper water or fast-moving currents.
SEASONS
Each season on the Big Thompson brings unique joys and challenges for AvidMax anglers:
Spring
Spring runoff can raise water levels, but the tailwater releases from Lake Estes provide more stable conditions, making nymphing with stoneflies, baetis, and midges effective. Focus on deeper runs and seams where trout hold during higher flows.
Summer
Summer offers excellent dry fly fishing with hatches of caddis, PMDs, and terrestrials like hoppers and ants. Early mornings and late evenings provide the best opportunities for dry fly action in riffles and along the banks.
Fall
Fall is prime for targeting large brown trout as they prepare to spawn, with streamers and egg patterns working well in deeper pools and near structure. Focus on these areas where aggressive fish tend to hold during the pre-spawn period.
Winter
Winter fishing is productive due to the consistent tailwater releases, with small midge and baetis nymphs being highly effective. Concentrate on slower, deeper water during the warmest part of the day to find active trout.
REMEMBER
The Big Thompson River below Lake Estes is a popular and productive tailwater fishery with consistent flows and year-round fishing opportunities, but its clear waters and technical conditions require skill and careful handling of fish to preserve the health of this fishery.
Water Conditions
Flow rates can vary depending on releases from Lake Estes, so check the water levels before your trip to ensure safe wading and productive fishing. Lower flows provide easier wading but may demand more delicate presentations.
Regulations
Portions of the Big Thompson below Lake Estes are catch-and-release only with artificial flies and lures required, so be sure to familiarize yourself with the regulations to help maintain this quality fishery.
Safety
While generally accessible, wading can be tricky in areas with faster currents and deeper pools. Use caution, especially after dam releases or during periods of higher flow, and wear proper wading boots for traction on the slick, rocky riverbed.
COMMENTS
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