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.