Fly Fishing Stream Conditions Report: Blue River

Period:

Sep 2026Aug 2026Jul 2026Jun 2026Jan 2026Oct 2025Nov 2024Apr 2024Mar 2023

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.

Juju Baetis fly pattern

Juju Baetis

Size: 20-22
nymph
EP Topwater Shrimp fly pattern

EP Topwater Shrimp

Size: 20-22
crustacean
Top Secret Midge fly pattern

Top Secret Midge

Size: 20-22
emerger
Manhattan Midge fly pattern

Manhattan Midge

Size: 20-22
nymph
Chocolate Thunder fly pattern

Chocolate Thunder

Size: 20-24
emerger

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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