San Juan River — Hatch Calendar
The San Juan below Navajo Dam is a midge factory: cold, stable flows support trout densities among the highest anywhere, feeding on tiny midges and Baetis nearly every day of the year.
tailwater5,650 ft elevation
September 2026
1
5
10
15
20
25
30
Mayflies
Midges
Terrestrials
Crustaceans
Active range Peak period Sparse Heavy / Blanket