Missouri River — Hatch Calendar
The Missouri River below Holter Dam is a tailwater paradise with dense populations of large rainbows and browns feeding on prolific Trico hatches, PMD emergences, and year-round midges through the 30-mile canyon section.
tailwater3,400 ft elevation
August 2026
1
5
10
15
20
25
30
Mayflies
Midges
Terrestrials
Active range Peak period Sparse Heavy / Blanket