Stillwater River Fly Fishing Report - April 4/5/2026

Fly Fishing Report

STILLWATER RIVER FLY FISHING REPORT

Cold-water focus: nymphs, midges, BWOs & slow streamers

Report Date: April 5, 2026  |  Next Update: April 12, 2026

Current River Conditions

Early spring conditions — water remains cold and trout are holding deep and tight. Focus on subsurface presentations: deep nymph rigs, tight-line / euro setups and slow, deliberate streamer work.
Flows & Clarity
Flow: Regulated/reservoir-influenced — low to moderate spring releases
Water Clarity: Mostly clear to slightly stained in runs; visibility variable near banks
Water Temperature
Current: ~40–44°F (4–7°C)
Daily Range: 38–47°F
Trend: Slowly warming through April — fish remain in cooler, deeper lies
Weather
Forecast: Cool mornings, mild afternoons; light wind most days
Angling windows: Best subsurface action morning through midday; streamer opportunities any time in low light
Access & Safety
Access: Most public access points open; expect muddy/soft banks in some sections
Safety: Cold-water shock risk—wear an insulated wading layer and always carry a wader belt and PFD on the boat

Hatch Chart & Insect Activity (early April)

Insect Size Activity Level Prime Time
Midges (all stages) #18–24 High ⭐⭐⭐⭐ All day — fussy rises and soft takes
Blue-winged Olives (Baetis) #18–22 Moderate ⭐⭐⭐ Low light, late morning to early afternoon
Small stonefly nymphs (early instars) #8–14 Light ⭐⭐ Midday along rocky runs
Caddis (minimal) #16–20 Very light ⭐ Occasional evening activity

Recommended Flies (spring, cold-water emphasis)

Nymphs — deep, weighted and euro-style

Primary approach: tungsten flies and tight, high-angle presentations. Run two flies when possible (heavier point, lighter trailer) or single heavy perdigon for fast sinks.

Midges — micro-nymphs and tiny beadheads

Midges are the backbone of early-spring feeding. Slow everything down and fish micro-sizes on long leaders.

Streamers — slow retrieves, long pauses, and deep contact

When trout key on baitfish or are positioned in deep troughs, slow, deliberate streamer work is deadly. Use sinking tips or weighted streamers to get low and keep it there.

Emergers / Blue-winged Olive (BWO) — tight dry/emergent combos

Fish the surface or near-surface with parachute/emergers in calm windows; pair with a small nymph trailing or beneath an indicator during mixed activity.

Tactics & Tips — cold-water strategies (what to fish and how)

Focus on depth and presentation over flash. Here are pragmatic, time-tested approaches for April:
  • Deep indicator nymphing: Two-fly rigs with a heavy point fly (tungsten jig/perdigon) and a lighter trailing nymph. Set your indicator so the point fly runs the bottom 6–12 feet depending on current and run depth. Suggested sizes: #12–18 (bead), tippets 4X–6X behind leader.
  • Tight-line / Euro nymphing: For clear, technical water: use a long, stiff leader/sighter, tungsten perdigons and jigs. Keep slack out and watch subtle sighters — small, short takes are common in cold water.
  • Midge strategy: Slow-sink micro-zebra midges and small tungsten midges will out-fish larger, flashier patterns right now. Fish them on long leaders, short drifts, and shallow mends. Use micro split-shot or 1–2 jig flies to reach fish holding just off the bottom.
  • Slow streamer work: Use sinking-tip lines or weighted streamers. Slow, 3–6 foot strips followed by a long pause often triggers lethargic trout. Target deep seams, tailouts and the heads of holding pools. If water is very cold, lengthen pauses and fish smaller streamer profiles.
  • Emerger & surface play: When BWOs are visible, present parachute/emergers on long tippets (5X–6X). When fish are sipping, swap to a small emerger or micro parachute and shorten leader mends to reduce drag.
  • Leader, tippet & rigging suggestions: Indicator rigs: 9–11 ft leader, 4–6 ft nylon leader section to indicator; euro rigs: 10–12 ft light, stiff leader and short tippet connection. Tippet sizes: 3X for heavy nymph leaders to 6X for midge droppers. Use barbless hooks where possible to reduce handling stress.
  • Where to fish: Deep seams, undercut banks, inside tails and the heads of pools. In faster water, fish the near-bottom seams with heavier tungsten; in slack water, present thin midge patterns just above the substrate.
  • Time-of-day: Midge and BWO activity is often steady — early morning through midday is reliable. Streamer chances increase in low light (morning, evening, overcast) and during cooler water releases.
  • Conservation: Water is cold — handle trout quickly and minimize air exposure. Consider shortened fights and immediate release to reduce mortality.

Quick Rig Examples

Deep Indicator Nymph
Point: tungsten jig (#12–14)
Trailer: pheasant tail / Frenchie (#14–18)
Indicator set to run bottom 6–12 ft
Euro/Perdigon Rig
Long sighter, short tippet to perdigon (#18–14)
Weight: 2–4mm tungsten; steady, tight-line contact
Midge/Dropper
Indicator or euro sighter with micro midge (#20–24) 18–30" below an attractor
Fish slow, short drifts

Recommended Patterns Quick Reference

Type Top Patterns (links)
Nymph Egan's Thread Frenchie Jig - Olive, Egan's Frenchie, Pheasant Tail Tungsten, Roza's World Spain Perdigon (barbless)
Midge Black Zebra Midge (TBH), Bling Midge - Black, Top Secret Midge, Jujubee Midge - Olive
Streamer Egan's Poacher - Olive, Egan's Poacher - Black, Coffey's CH Sparkle Minnow Sculpin, Sculpzilla - Olive
Emerger / BWO Parachute - Blue Wing Olive, Barr's Flashback Emerger - BWO, Antonio's Adult BWO, Egan's Silver Bullet - Baetis

Final Notes

Stick to cold-water tactics this week: dig deep with tungsten nymphs and perdigons, keep presentations slow and contact-oriented for streamers, and present tiny midge/baetis imitations on long, supple leaders. Avoid flashy terrestrial approaches — trout remain deep and focused on subsurface food.