RIVER REPORT
Blue River | Silverthorne
The Blue River at Silverthorne is one of Colorado’s premier tailwater fisheries, located just below Dillon Reservoir. Known for its trophy-sized rainbow and brown trout, this Gold Medal section of the river is revered for its consistent year-round flows and cold, oxygen-rich water, creating ideal conditions for both fish and aquatic insect life. Hatches of midges, mayflies, and small stoneflies dominate the river, making nymphing with small, technical flies a popular technique. The river flows through the heart of Silverthorne, offering easy access for anglers, with deep pools and fast riffles providing excellent habitat for trout. Its proximity to town, combined with the challenge of landing large, wary trout, makes it a favorite spot for anglers looking for high-quality fishing close to urban amenities.
CONDITIONS
Weather & Flow Data Reported From OpenWeather and USGS
Recent Reports
Blue River @ Silverthorne – April Fly Fishing Report: As of early April, the Blue River through Silverthorne is experiencing low flows, approximately 55 cubic feet per second (CFS), resulting in technical fishing conditions. Water temperatures remain cold, typically in the lower 40s°F, sustaining a diet primarily composed of midges and Mysis shrimp for the resident trout. Anglers have found success using small nymph patterns such as Zebra Midges (#20–24), RS2s (#20–22), and Mysis Shrimp imitations (#16–20). Given the river’s clarity and the trout’s wariness, sight fishing with light tippets (6x or 7x) and precise presentations is essential. Focusing efforts during the warmest parts of the day, typically late morning to mid-afternoon, can enhance success rates. Overall, the Blue River in Silverthorne offers rewarding opportunities for anglers prepared to meet its challenges this April.
Water Flow Data
5 Day Outlook
BUGS
Blue River’s insect life provides a smorgasbord for hungry trout. AvidMax recommends these key fly patterns:
THE FISHERY
The Blue River at Silverthorne is a renowned tailwater fishery known for its crystal-clear waters and trophy-sized trout, offering anglers a technical and rewarding fishing experience just below the Dillon Dam.
Fish Species
The Blue River at Silverthorne is renowned for its large rainbow trout, some of which can exceed 20 inches, along with healthy populations of brown trout. This tailwater section below Dillon Reservoir benefits from steady, cold flows, creating ideal conditions for trout to thrive year-round, making it a popular destination for anglers targeting trophy fish.
Unique Fishing Conditions
The Blue River at Silverthorne is a highly technical fishery, known for its clear, slow-moving water. Fish are often visible, but they can be very wary, requiring delicate presentations and small flies. Popular fly patterns include mysis shrimp (flushed from Dillon Reservoir), small midges, and blue-winged olives (sizes 18-24). Winter fishing remains productive due to the consistent water temperatures from the dam, with nymphing being the most effective method.
Access and Regulations
Easy access is available right in the town of Silverthorne, with public fishing spots along the Blue River Trail, making this stretch heavily fished, particularly near the outlets. The Blue River here is designated as Gold Medal Waters, meaning strict catch-and-release regulations apply to all rainbows, and artificial flies and lures only. Practicing good stream etiquette is crucial, as this popular section sees heavy angling pressure year-round.
TACTICS
AvidMax encourages anglers to explore their full repertoire on the Blue River:
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 Blue River brings unique joys and challenges for AvidMax anglers:
Spring
Spring sees consistent flows due to the tailwater release, making nymphing with mysis shrimp, baetis, and midge patterns very effective. Focus on deeper runs and seams where trout hold in cooler water.
Summer
Summer brings great dry fly opportunities with hatches of caddis, PMDs, and terrestrials. Early mornings and late evenings are the best times for dry fly action, especially in the riffles and along the banks.
Fall
Fall is prime for targeting large brown trout moving up to spawn, making streamers and egg patterns highly effective. Look for deeper pools and near structure where larger trout are likely to hold.
Winter
Winter fishing remains productive due to the tailwater, with mysis shrimp and small midge nymphs being the go-to flies. Focus on deeper, slower pools during the warmest part of the day for the best chance at active fish.
REMEMBER
The Blue River at Silverthorne is a renowned tailwater fishery known for its crystal-clear waters and trophy trout, but its technical nature requires patience and precision. Respect the river’s health by practicing ethical fishing, especially given the high angling pressure in this popular area.
Water Conditions
Being a tailwater, flows are generally consistent, but they can fluctuate with releases from Dillon Dam. Always check flow reports before heading out, as flow levels can impact both wading safety and fish behavior.
Regulations
This section of the river is strictly catch-and-release with artificial flies and lures only. Adhering to these regulations helps maintain the trophy trout population that makes this fishery so special.
Safety
The river is heavily fished, and wading can be tricky due to slick rocks and deeper pools. Wear proper wading gear and use caution, especially in the faster currents near the dam, to ensure a safe and enjoyable experience.
COMMENTS
We want to hear from you! Have you fished this River or have any advice for fellow anglers?
Leave a Reply