Rock River Near Rock Valley, IA
USGS Site No: 06483500 • Rock River • Sioux County, IA
Rock River Near Rock Valley, IA on the Rock River is currently at 794 cfs (High — 85th percentile for this date) . Gage height: 6.05 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for October 28 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.
| Percentile | Label | CFS Threshold | Today's Flow |
|---|---|---|---|
| 10th | Very Low threshold | 23 | |
| 25th | Low threshold | 52 | |
| 50th (Median) | Normal (median) | 106 | |
| 75th | High threshold | 415 | |
| 95th | Very High threshold | 1,150 | Today: 794 cfs |
30-Day Hydrograph
Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.
30-Day Flow History
| Date | Discharge (CFS) | Gage Ht (ft) |
|---|---|---|
| May 28, 2026 | 856 | — |
| May 27, 2026 | 927 | — |
| May 26, 2026 | 1,000 | — |
| May 25, 2026 | 992 | — |
| May 24, 2026 | 746 | — |
| May 23, 2026 | 672 | — |
| May 22, 2026 | 615 | — |
| May 21, 2026 | 605 | — |
| May 20, 2026 | 624 | — |
| May 19, 2026 | 626 | — |
| May 18, 2026 | 639 | — |
| May 17, 2026 | 553 | — |
| May 16, 2026 | 467 | — |
| May 15, 2026 | 483 | — |
| Apr 20, 2026 | 277 | — |
| Apr 19, 2026 | 284 | — |
| Apr 18, 2026 | 293 | — |
| Apr 17, 2026 | 304 | — |
| Apr 16, 2026 | 314 | — |
| Apr 15, 2026 | 323 | — |
| Apr 14, 2026 | 330 | — |
| Apr 13, 2026 | 335 | — |
| Apr 12, 2026 | 343 | — |
| Apr 11, 2026 | 346 | — |
| Apr 10, 2026 | 356 | — |
| Apr 9, 2026 | 367 | — |
| Apr 8, 2026 | 380 | — |
| Apr 7, 2026 | 388 | — |
| Apr 6, 2026 | 392 | — |
| Apr 5, 2026 | 375 | — |
Station Information
- USGS Site No
- 06483500
- State
- IA
- County
- Sioux County
- Coordinates
- 43.2151, -96.2950
- Drainage Area
- 1,592 mi²
- Datum (ft)
- 1,223.4
- HUC Code
- 10170204
Flood Stage Thresholds
- Action Stage
- 14.0 ft
- Flood Stage
- 16.0 ft
- Moderate Flood
- 17.0 ft
- Major Flood
- 19.0 ft
Currently 9.95 ft below flood stage.
Recent Extremes
- Max discharge
-
1,230 cfsJul 2, 2025
- Min discharge
-
101 cfsDec 4, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
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Big Sioux River Near Hawarden, IANormal15.0 mi · 1,250 cfs
-
Rock River Below Tom Creek at Rock Rapids, IANormal15.8 mi · 177 cfs
-
Beaver Creek at Canton SDUnknown16.0 mi
-
West Branch Floyd River Near Struble, IAVery High21.0 mi · 159 cfs
-
Floyd River at Alton, IAVery High21.9 mi · 278 cfs