152 CFS: A Technical Edge, but Watch the Fish
The gauge is sitting at 152 CFS this week — right at the bottom ledge of Deckers’ sweet zone. That’s not a complaint; it’s a clarity call. This flow is just enough to keep you wading without constant scrambling, but it’s tight enough that every fish you spook is a fish you won’t get back. The water is gin-clear, the holding lies are compressed, and trout can see your leader from ten feet upstream.
Here’s the practical read: the deeper riffles and current tongues along the roadside stretch are still fishable — wade slow, keep your shadow off the water, and assume every brown is watching. The shallower inside bends and glassy runs are going to demand smaller flies, longer tippets, and patience that borders on meditation. Water temperature is dropping fast with the calendar flip into September, so fish stress is lower than it was in August, but clarity still cuts both ways. You’re not fighting blown-out banks or high-water blindness; you’re fighting the fact that trout can see everything you do.
The upside: low, clear water like this is where tight-line nymphing and dead-drifting small dries separate the honest anglers from the hope-and-cast crowd. It rewards precision.
Fall BWOs Are Starting to Show — and Tricos Are Fading
The seasonal pivot is underway. Tricos — those tiny black-and-white spinners that have been the morning workhorse — are waning as daylight shrinks. In their place, Blue-Winged Olives (#20–22) are beginning to emerge on overcast afternoons, usually between 2 and 4 p.m., sometimes later if clouds hold through dusk. These aren’t the dense, predictable clouds of spring; September BWOs are more sporadic, more selective, and they reward an angler who’s actually watching the water instead of just assuming.
Midges remain the year-round foundation here. At 152 CFS and this time of year, small black and zebra patterns in #20–24 are working in the deep slots and slow edges throughout the day. Barr’s Emerger in black or mercury, RS2s, and black Beauty patterns will move fish when nothing else does. These aren’t fancy — they’re honest, small, and they work because they’re what’s in the water.
Terrestrials — grasshoppers, small beetles, ants — still have legs this time of year, especially on breezy afternoons. A size #12–14 hopper or foam ant can draw aggressive takes from holding fish if you place it near structure, but don’t overstay the bet. September terrestrial fishing is a bonus move, not the plan.
How to Rig for This Week
At this flow and clarity, your rig design matters.
Nymph setup: Start with a heavier anchor fly — a Barr’s-style nymph or weighted caddis pupa in #16–18 — on your point. Drop 18–20 inches of 4x to a #20–22 midge emerger or small Baetis nymph. Add a single split shot 6–8 inches above the dropper; this keeps you on bottom in the deeper runs without overweighting and dragging bottom constantly. Indicator above the rig, 1.5 times the depth of your water. In the shallow edge water (ankle to mid-shin), drop the split shot or go un-weighted entirely and fish a slow swing instead.
Tippet: 4x to the anchor fly, 5x to the dropper. At this clarity, 5x is not overkill — it’s respect.
Dry-dropper if BWOs are rising: Tie a small, bushy midge dry (#20–22 black parachute or similar) as your indicator and top fly. Drop 20 inches of 5x to a #20 BWO emerger or Barr’s Emerger in olive or black. Cast to likely holding water — behind rocks, along current seams, in the soft edges of runs — and fish it dead-drift. The dry will give you visual contact and occasional surface takes.
Tight-line nymphing: If you want to eliminate the indicator entirely, use a 3x–4x mainline, pinch a small split shot 18 inches above your flies, and fish two small nymphs (midge emerger point, small Baetis dropper) tight to your line. This is sensitive work, especially in low water, but it’s deadly when fish are spooked by indicators.
Water Types Worth Your Time
Skip the flat, glassy tailouts entirely right now — they’re too shallow and too exposed. Focus instead on the deeper riffles and run-heads where broken, tumbling water masks your presence. The fast, boiling sections where current meets the banks offer both cover and holding depth; fish these with short drifts, frequent casts, and minimal wading noise.
The inside bends and slower seams are productive if you approach from downstream and keep your casts long and your presentations fine. At 152 CFS, these slower edges hold fish, but they’re also the first place a trout will spook if it sees you or your leader.
The pocketwater near mid-river rocks — the small hydraulics and current shadows — is classic Deckers architecture. Work these methodically, but don’t camp. One good drift per pocket, then move on.
A Welfare Note
September water temperatures on this reach are dropping, usually into the mid-50s by week’s end. That’s good news for fish welfare, but if you catch a brown that’s visibly spawning or staging in preparation, handle it gently, keep it wet, and return it without delay. Pre-spawn browns are aggressive and will chase flies; don’t mistake that aggression for a fish that’s in good shape to be played hard.
Fish the clear water with respect. Low, bright conditions are a gift for technique, not a free pass to be careless.