Deckers Hatch Report — June 6, 2026

We’re holding at 243 CFS right now—a solid, fishable level for early June. This flow sits in that sweet spot where the South Platte isn’t blown out from runoff but has enough push to keep good oxygenation and food movement through the system. The water temperature is likely in the mid-50s, climbing toward the low 60s by midday. At this flow, the river is readable without being pushy; you’ll find defined current seams, accessible pocket water, and soft edges that don’t demand a boat or extreme wading. Conditions favor methodical nymphing and some dry action during peak hatch windows.

What’s Hatching

Early June on the lower South Platte centers on three primary systems, and you need all three in your box.

Pale Morning Duns are the marquee hatch right now. Fish #16 and #18 Pale Morning Dun nymphs in the morning and early afternoon—both Barr Emerger patterns and traditional pheasant-tail variants work. The dun emergence typically peaks between 9 a.m. and early afternoon; have #16 and #18 dries ready (Comparadun or extended-body patterns hold up best in moving water). Expect sporadic spinner falls in the evening around 7–8 p.m., with #16–18 PMD Spinners collecting fish in soft seams and behind rocks.

Brown Drake nymphs are ramping up into their pre-hatch phase. You won’t see full emergence yet, but fish are keying on nymphs moving toward structure to hatch. Fish #10–12 Brown Drake nymphs (large, dark, weighted) tight to vegetation, deeper runs, and the undercut banks. These nymphs are meaty and trigger aggressive takes. A few spinners may appear mid-to-late evening if air temperatures hold.

Caddis remain consistent, though not dominant. #14–16 tan and olive caddis pupae should be in rotation as a second fly in your two-fly rig. If you see surface activity around 6 p.m., have #14–16 Elk Hair Caddis dry flies handy; they’ll draw decisive strikes.

Best Water This Week

Soft inside seams and slower edges are your highest-percentage zones at 243 CFS. The water has enough velocity to hold bugs and fish, but the inside bends and current breaks still provide relief. Fish nymph rigs here with a slow dead-drift; PMD nymphs and brown drakes will track through these seams naturally. Expect 15–20 fish per hour in prime sections if you’re precise with your presentation.

Pocket water and broken current around mid-river boulders fish exceptionally well at this flow. The rocks create pockets stable enough to hold trout without requiring powerful water. A #16 PMD nymph bounced through these zones, or a two-fly setup with a heavier brown drake point fly and a PMD dropper, will connect with active fish. The broken water also masks your presence and leader, so you can get closer before spooking fish.

Deeper runs with moderate current hold larger fish and work best during early morning and low-light hours. Fish these zones with a full-sink leader and a weighted point fly (brown drake nymph) ahead of a lighter trailing pattern. The slower feeding activity in deeper water rewards patience and longer drifts—don’t rush your casts.

Tactics

Leader and tippet setup: Use a 9-foot, 4X butt tapered leader. Drop down to 5X for PMD nymphs and dries, and 4X for brown drake nymphs and caddis work. The clear, moderate-flow conditions warrant fine tippet, but you need 4X when fishing larger nymphs to turn them over and handle brief tussles with larger rainbows.

Two-fly rig: Tie a brown drake nymph (#10–12, 70–80 grains) as your point fly, and a #16 PMD nymph or #14 caddis pupa 18–24 inches up the leader via a clinch knot. This combination covers the depth column and gives you two targets. The heavier point fly carries the rig; the dropper rides higher and slower, catching fish that won’t chase a deep presentation.

Dry-dropper option: If you see PMD duns on the water, use a #16 PMD Comparadun as your dry, with a #16 PMD nymph or #14 caddis pupa hung 18 inches below. You’ll catch risers on the dry and subsurface feeders on the dropper. This rig works from 10 a.m. to mid-afternoon during the emergence.

Practical Notes

Water clarity is good; visibility runs 4–5 feet at this flow. Wear polarized sunglasses, wade deliberately, and cast from downstream whenever possible.

The lower South Platte sees moderate pressure during early June weekends. Weekday fishing will give you more solitude and less spooked fish, but the hatch will turn on regardless—it’s calendar-driven, not crowd-driven. Plan accordingly.