Upper Basin: Leadville to Buena Vista
Upper Basin: Leadville to Buena Vista — Fishing Report for April 27, 2026
Quick Stats
Flow: 31 CFS | Trend: Rising sharply (+20% in 24h) | Fishability: Fair | Weather: Chance snow showers, high 35°F
The Bite
Winter is making a stubborn exit in the upper basin this week. A cold, snowy pattern has locked temperatures in the low-to-mid 30s through Wednesday, and flows at the Leadville gauge — while still within the fishable band at 31 CFS — are climbing fast. That 20% rise in 24 hours is worth watching: it likely reflects overnight snowmelt pulses rather than a sustained runoff surge, but it signals that the pre-runoff window is tightening. With basin snowpack at just 11% of normal and water-year precipitation running at 62%, this year's runoff pulse is expected to be modest and potentially short-lived — which is actually good news for anglers. The upper basin may stay fishable longer than a typical April, but that doesn't mean today is easy.
The saving grace is the sky. Overcast conditions — even snowy ones — are prime BWO weather, and a hatch window between noon and 3 PM is realistic if temperatures nudge toward the forecast high. Water temps aren't available from the Leadville gauge today, but air temps in the mid-30s suggest the river is cold, likely in the low-to-mid 40s°F range. Fish will be sluggish in the morning and most active during any midday warmth. Don't expect aggressive takes — presentations need to be precise and drag-free.
At 31 CFS, the river is running low and clear. That's a double-edged sword: fish are visible and concentrated, but they're also spooky. Long leaders, fine tippet, and careful wading will matter more than fly selection today.
What to Fish
- Parachute BWO #18-20 — Primary dry fly during the midday hatch window; fish it on a drag-free drift through slower tailouts and flats
- Sparkle Dun BWO #20 — Excellent emerger option when fish are sipping just under the surface film
- Pheasant Tail Nymph #16-18 — Workhorse nymph for the pocket water near Granite; keep it near the bottom
- RS2 #20-22 — Trail this 12–16" behind a Pheasant Tail as a dropper for a double-nymph setup
- Griffith's Gnat #18-20 — Midge cluster pattern for the slow morning hours before the BWO window opens
- Black Stonefly Nymph #14-16 — Worth swinging or dead-drifting through riffles; stonefly nymphs are active in this cold water
Tactics & Rigging
For the morning, keep it simple: a single Griffith's Gnat or a Pheasant Tail under a small indicator through the slower runs. Use 5X fluorocarbon to start, but consider dropping to 6X in the clearest, slowest water — at 31 CFS with cold, gin-clear conditions, fish will inspect your tippet. When the BWO window opens around midday, switch to a 9-foot 5X leader with a Parachute BWO on point. If fish are rising but ignoring the dry, try trailing a Sparkle Dun #20 on 12" of 6X fluorocarbon behind it as a dry-dropper — the Parachute rides as the anchor and indicator while the Sparkle Dun rides just in the film.
Focus your effort on the slower meadow sections near Leadville and the transitional runs above Granite rather than the fast pocket water. In low, cold flows, fish stack in the deeper slots and slower water where they don't have to fight current. Wade carefully — low water means fish are concentrated but easily spooked by vibration.
Access & Logistics
Snow showers are in the forecast through Wednesday, so check road conditions on US-24 before heading up, particularly above Granite. Parking at most AHRA access sites is straightforward, but trail surfaces near the river may be icy or muddy. Dress in layers — a 35°F high with wind and snow feels much colder streamside. Stop by local fly shops in Buena Vista for current flies, road conditions, and to support the shops that keep these fisheries healthy.
Looking Ahead
Flows will continue rising through the week as the snowpack drains, but with basin snowpack at just 11% of normal, this year's runoff should be relatively tame — the upper basin may stay fishable into May when it typically blows out. Watch the Granite gauge: if flows climb past 150–200 CFS, shift your attention to the Middle Basin or the tailwaters downstream. Always verify current regulations with CPW before fishing.