Waters · United States
Yakima River (Union Gap) fishing report
Updated Tuesday, 25 August 2026 · refreshed automatically through the day
Washington's only blue-ribbon trout stream is an irrigation river: its flows run backwards from the natural pattern, high in summer for the orchards and low in winter.
Today's report: good (73/100)
Smallmouth Bass is the most promising species on Yakima River (Union Gap) today. Water temperature is around 18.7°C and barometric pressure is stable. Gauge YAKIMA RIVER ABOVE AHTANUM CREEK AT UNION GAP, WA shows the water level rising (0 cm/24h).
Yakima River (Union Gap) water temperature and flow
- Discharge: 74.5 m³/s (2,631 cfs) — up 0% over 24 hours
- Level trend: rising (0 cm/24h)
Measured at gauge YAKIMA RIVER ABOVE AHTANUM CREEK AT UNION GAP, WA · reading 34 min ago. Published by the national hydrological service, not estimated by us.
Best time to fish today
- 04:00–06:00 local time — score 62/100
- 07:00–09:00 local time — score 73/100
- 03:00–05:00 local time — score 62/100
3-day outlook by species
| Species | Tuesday 25 Aug | Wednesday 26 Aug | Thursday 27 Aug |
|---|---|---|---|
| Rainbow Trout | 43 — fair | 42 — fair | 39 — poor |
| Smallmouth Bass | 73 — good | 65 — good | 69 — good |
| Chinook salmon | 42 — fair | 42 — fair | 45 — fair |
Why this score
Cast & Scan uses a deterministic, published scoring model — no black box. The strongest influences on today's Yakima River (Union Gap) rating:
- water temperature: helping (+1)
- wind: helping (+1)
- precipitation: helping (+0.9)
- river flow: helping (+0.9)
- season: helping (+0.85)
- pressure trend: helping (+0.8)
Forecast computed Tue, 25 Aug 2026 11:03:48 GMT · data: Open-Meteo + gauge YAKIMA RIVER ABOVE AHTANUM CREEK AT UNION GAP, WA · refreshed automatically through the day · see our published accuracy
Scan your exact spot
This page rates a representative point on Yakima River (Union Gap). Bays, river mouths and depth changes can fish very differently — open the scanner, drop a pin on your exact swim and get a spot-specific forecast with tactics. Free, in the browser, no signup.
Wondering how this stacks up against the apps you already know? Cast & Scan vs Fishbrain vs BassForecast — an honest comparison, including where they beat us.
Nearby waters
- John Day River (Lower) — Oregon, USA (105 km away)
- Wenatchee River (Monitor) — Washington, USA (107 km away)
- Deschutes River (Sherars Falls) — Oregon, USA (148 km away)
- Methow River (Pateros) — Washington, USA (174 km away)