Fishing Current and Drift Speed Calculator
Calculate river current speed and drift fishing pace in mph or km/h from GPS data or float time.
Optimize drift speed for the best lure or fly presentation.
Understanding current speed is essential for drift fishing — whether for trout with a nymph, walleye with a bottom rig, or float fishing for salmon. Speed determines how your bait drifts and how long it spends in productive water.
Float timing method: The simplest way to measure current: time how long a floating object takes to travel a known distance.
Speed = distance / time
Current speed categories:
| Speed | Description | Fishing notes |
|---|---|---|
| 0–0.5 m/s | Slow / pool | Dead-drift nymph, float fishing |
| 0.5–1.5 m/s | Moderate run | Prime trout water, swinging wet flies |
| 1.5–2.5 m/s | Fast run | Heavy tungsten nymphs, streamers |
| 2.5+ m/s | Rapid / white water | Difficult to fish effectively |
Optimal drift speed for species:
- Trout (nymph fishing): 0.3–0.8 m/s: slow enough for natural presentation
- Salmon (float fishing): 0.5–1.2 m/s
- Walleye (bottom bouncing): 0.5–1.0 m/s
- Steelhead: 0.6–1.5 m/s
Why speed matters for lure depth: A lead-core or weighted rig sinks at a rate related to current speed. Faster current = less time for the rig to sink to the bottom. You need heavier weights or slower retrieves in faster water to maintain bottom contact.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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