Report Summary for Sep 2026
This year: Outflows below Dillon Reservoir are holding low and clear at 53 CFS. The cold water temperatures mean you'll find the best fishing from mid-day to dark. Fishing is highly technical under these low flow conditions, so you will need to bring your A-game, maintain a stealthy approach, and use fine tippets. Expect reliable hatches of midges in the morning hours, followed by blue-winged olives starting in the afternoon. Focus on technical nymphing and dry-fly presentations. Tiny patterns are key to success right now. Make sure your box is stocked with the Manhattan Midge, Top Secret Midge, and Juju Baetis in sizes 20 to 22.
Best time of day: Afternoon
Prior years: No prior years report for this period.
This report combines publicly available data when available with our own analysis to give a comprehensive view of the stream conditions.
Recommended patterns

Juju Baetis

EP Topwater Shrimp

Top Secret Midge

Manhattan Midge

Chocolate Thunder
Likely species
Monthly water conditions
BLUE RIVER NEAR DILLON, CO
This month
32 CFS
Avg 52°F (46-62°F)
Last month
37 CFS
Avg 54°F (48-64°F)
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