Fly Fishing Rio Mora

Overview

The lower Rio Mora runs from the Pecos Wilderness boundary below Iron Gate to its confluence with the Pecos River near Terrero. This steep, shaded tributary changes from riffle-and-pool water near the mouth to the boulder gardens, bedrock ledges and short plunge pools of the Mora Box. Brown trout and tight casting lanes make it a stream for careful pocket-water presentations.

Snowmelt raises and colors the river in spring; lower summer water reveals more of the small seams and slots. A buoyant dry with a beadhead dropper covers those pockets, while a weighted stonefly nymph or small streamer gives you another approach to the deeper pools. Watch for caddis, mayflies and terrestrials before choosing a surface pattern.

From Riffles to the Mora Box

The character of the stream changes quickly upstream from the Pecos confluence. Willow and alder line the lower riffle-and-pool water. Farther up, the valley pinches into the Mora Box and the river becomes freestone pocket water: bedrock ledges, boulder gardens, short plunge pools and shallow riffles. Bear Creek enters from the east before the canyon steepens farther upstream.

The gradient keeps the river moving from one pool to the next. Undercut banks, log jams and boulders offer cover alongside the current, while the canyon's tight lanes call for a deliberate casting angle. Take time to read the near water before reaching toward the next pocket.

Dry-Droppers and Deeper Pools

A seven-and-a-half to eight-foot 3-weight is an option for the tight casting lanes, paired with a nine-foot leader tapered to 5X and a short tippet for turnover in canyon wind. A buoyant Humpy or Parachute Adams in size 12 to 16, trailing a small beadhead nymph, gives you a dry-dropper approach to the pockets and seams. Adjust the dropper to the depth and current of the lane you are fishing.

Try a weighted stonefly nymph in a deeper plunge pool, giving it time to sink before the current carries it into the shallows. A small streamer stripped through the same pool on a cloudy fall afternoon offers a different presentation. Approach from downstream and keep a low profile so your first cast reaches the pocket before your shadow does.

Slow Down and Read Each Pool

Fishing the Rio Mora well is mostly a matter of slowing down. A plunge pool has a bubble line where the current enters, a soft seam on each side and a tailout. Fish the tailout first from downstream, then the seams, then drop a nymph into the bubble line and let it sink through the deeper water.

In the riffle-and-pool water near the mouth, a longer drift covers the gravel lanes. Up in the box, a short drift beside or behind a boulder may be the useful part of a cast. Change position as well as flies: a small shift can keep the line from dragging the presentation across the seam. At dusk, a small streamer or weighted nymph through a pool gives you another way to explore the water beneath the surface.

Snowmelt, Storms and Fly Choices

Snowmelt changes the level and clarity of this small tributary in spring. As the water settles, the lanes between boulders become more distinct. Summer thunderstorms can raise and color the stream again, while snow and ice alter the canyon in winter. Let the water you find guide the depth and pace of the presentation.

A weighted stonefly nymph such as the locally tied Woven Stone is one option as runoff recedes. Carry Rhithrogena mayfly and Elk Hair Caddis patterns for observed surface activity in the riffle tails. Hoppers and ants add another approach as the warm season progresses; a foam hopper with a small dropper can cover the bank-side pockets.

Midges offer a small-fly option on mild winter or early spring afternoons, and blue-winged olive patterns suit observed activity on overcast days. Match the fly to what you see, then concentrate on turning it over cleanly and keeping the drift in one current lane.