Top Blue-Winged Olive Nymph Patterns for January on the South Platte

Top BWO Nymph Patterns for Late Winter on the South Platte

Winter Fly Fishing on the South Platte: Mastering BWO Nymphs
January on the South Platte River presents a unique challenge for fly anglers. With cold water temperatures and wary trout, success often hinges on subtle presentations and precise fly selection. Among the most effective patterns during this time are Blue-Winged Olive (BWO) nymphs, a staple of the trout's diet in winter. These small but mighty flies mimic the aquatic insects that remain active beneath the surface, offering anglers a chance to hook into some of the river's finicky residents. Let’s dive into the top BWO nymph patterns and how to fish them effectively this month.

JuJu Baetis

• Size: 18–22
• Why it works: This realistic pattern mimics the slim, olive-colored BWO nymphs found in the South Platte. The flashy wing case adds visibility in cold, clear water.

RS2 (Nymph Version)

• Size: 18–22
• Why it works: A versatile emerger/nymph that imitates BWO nymphs as they ascend. Its simple profile matches the naturals perfectly.

Barr's Emerger (BWO)

• Size: 18–22
• Why it works: This classic nymph is a proven producer on the South Platte, particularly effective when fished in the middle of the water column.

Pheasant Tail Nymph

• Size: 18–22
• Why it works: While not explicitly a BWO imitation, its profile and coloration make it an effective stand-in, especially when paired with more specific patterns.

Two-Bit Hooker (Olive)

• Size: 18–22
• Why it works: The tungsten beads get it down quickly in the cold, fast currents, and the olive coloration matches BWO nymphs well.

WD-40

• Size: 18–22
• Why it works: A simple yet deadly pattern for imitating small baetis nymphs. Ideal for picky South Platte trout.

Fishing Tips for BWO Nymphs in January

• Rigging: Use a two-fly nymph rig with the BWO nymph as the dropper below a heavier attractor pattern (e.g., stonefly or egg).
• Depth: Focus on deeper runs and slower pools where trout hold during the winter.
• Tippet: Use 6X or 7X fluorocarbon for stealth in the clear, pressured waters.
• Presentation: Dead-drift your flies near the bottom with minimal drag. Adding split shot or using tungsten beads ensures they reach the feeding zone.