Rock River Below Tom Creek at Rock Rapids, IA
USGS Site No: 06483290 • Rock River • Lyon County, IA
Rock River Below Tom Creek at Rock Rapids, IA on the Rock River is currently at 177 cfs (Normal — 54th percentile for this date) . Gage height: 7.84 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 | 34 | |
| 25th | Low threshold | 54 | |
| 50th (Median) | Normal (median) | 119 | |
| 75th | High threshold | 530 | Today: 177 cfs |
| 95th | Very High threshold | 1,110 |
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 | 204 | — |
| May 27, 2026 | 230 | — |
| May 26, 2026 | 255 | — |
| May 25, 2026 | 283 | — |
| May 24, 2026 | 238 | — |
| May 23, 2026 | 199 | — |
| May 22, 2026 | 163 | — |
| May 21, 2026 | 144 | — |
| May 20, 2026 | 158 | — |
| May 19, 2026 | 172 | — |
| May 18, 2026 | 140 | — |
| May 17, 2026 | 109 | — |
| May 16, 2026 | 90 | — |
| May 15, 2026 | 96 | — |
| Apr 20, 2026 | 105 | — |
| Apr 19, 2026 | 111 | — |
| Apr 18, 2026 | 116 | — |
| Apr 17, 2026 | 124 | — |
| Apr 16, 2026 | 134 | — |
| Apr 15, 2026 | 140 | — |
| Apr 14, 2026 | 145 | — |
| Apr 13, 2026 | 145 | — |
| Apr 12, 2026 | 147 | — |
| Apr 11, 2026 | 150 | — |
| Apr 10, 2026 | 155 | — |
| Apr 9, 2026 | 165 | — |
| Apr 8, 2026 | 178 | — |
| Apr 7, 2026 | 190 | — |
| Apr 6, 2026 | 205 | — |
| Apr 5, 2026 | 208 | — |
Station Information
- USGS Site No
- 06483290
- State
- IA
- County
- Lyon County
- Coordinates
- 43.4231, -96.1649
- Drainage Area
- 853 mi²
- Datum (ft)
- 1,308.8
- HUC Code
- 10170204
Flood Stage Thresholds
- Action Stage
- 11.0 ft
- Flood Stage
- 13.0 ft
- Moderate Flood
- 16.0 ft
- Major Flood
- 19.0 ft
Currently 5.16 ft below flood stage.
Recent Extremes
- Max discharge
-
1,440 cfsJul 1, 2025
- Min discharge
-
39 cfsFeb 28, 2026
- Days at flood stage
- 0
Computed from the local daily-values archive.
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Split Rock Creek at Corson, SDNormal24.1 mi · 17 cfs
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-
Big Sioux River at Sioux Falls SDLow29.8 mi · 34 cfs