Blue River
OptimalColorado
Current Conditions
The Blue River is running at 50.5 CFS — ideal conditions. Expect clear water and excellent dry fly opportunities.
Last updated: Jul 5, 2026, 9:00 PM from USGS gauge 09046600 (Blue River near Silverthorne)
7-Day Flow Trend
Flow thresholds: Optimal 50–150 CFS | Fishable to 300 CFS | Marginal to 500 CFS
Water Temperature
Water temperature is in the optimal range for trout. Expect good insect activity and feeding.
About the Blue River
The Blue River below Dillon Reservoir is a productive tailwater that flows through Summit County to its confluence with the Colorado near Silverthorne. Small water with big fish and year-round fishing opportunities.
Hatch Chart
| Insect | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Midge Griffith's Gnat #20-24 | ||||||||||||
Blue-Winged Olive BWO Parachute #18-22 | ||||||||||||
Caddis Elk Hair Caddis #16 | ||||||||||||
Pale Morning Dun PMD Sparkle Dun #16 |
Active Hatches — July
Patterns: Elk Hair Caddis #16
Patterns: PMD Sparkle Dun #16
River Sections
Dillon Dam to Green Mountain Reservoir
wade access50.5 CFS
Tailwater section with excellent midge and BWO hatches. Technical water with selective trout.
Guides on the Blue River(19)
These fishing guides list the Blue River as one of their home waters.
Angler’s All
Littleton, Colorado
Blue Mesa Fly Fishing Guide
Frisco, Colorado
Blue River Anglers
Frisco, Colorado
Blue River Consulting
Frisco, Colorado
Breckenridge Outfitters
Breckenridge, Colorado
Colorado Fly Fishing Adventures
Pine, Colorado
Crested Butte Angler
Crested Butte, Colorado
Cutthroat Anglers
Silverthorne, Colorado
High Mountain Drifters Guide Service
Gunnison, Colorado
Mile High Angler
Denver, Colorado
Mountain Angler
Breckenridge, Colorado
Sunrise Anglers
Littleton, Colorado
Frequently Asked Questions
What is the best time to fish the Blue River?+
The Blue River fishes well from spring through fall. Peak dry fly season is typically June through September. The best hatches occur during summer months with PMDs and caddis. Fall brings excellent streamer fishing and fewer crowds.
What flies work on the Blue River in July?+
In July, the Blue River sees Caddis, Pale Morning Dun activity. Top patterns include Elk Hair Caddis #16, PMD Sparkle Dun #16. Always carry a selection of nymphs as well.
How many fishing guides operate on the Blue River?+
Avonture lists 19 fishing guides who operate on the Blue River. These guides offer local knowledge of hatches, access points, and current conditions that can significantly improve your experience.
What is the current flow on the Blue River?+
The Blue River's flow data is updated every 30 minutes from USGS gauge stations (waterdata.usgs.gov). Check the top of this page for current CFS readings, fishability status, and a 7-day flow trend chart. Optimal fishing flows are 50–150 CFS.
What fish species are in the Blue River?+
The Blue River primarily holds wild brown trout and rainbow trout. Fish sizes vary by section, with tailwater reaches typically holding larger fish.
Quick Conditions
Fishability Thresholds