Shell Rock River at Shell Rock, IA
USGS Site No: 05462000 • Shell Rock River • Butler County, IA
Shell Rock River at Shell Rock, IA on the Shell Rock River is currently at 1,650 cfs (High — 83th percentile for this date) . Gage height: 8.90 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 | 158 | |
| 25th | Low threshold | 264 | |
| 50th (Median) | Normal (median) | 482 | |
| 75th | High threshold | 938 | |
| 95th | Very High threshold | 2,720 | Today: 1,650 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 | 1,460 | — |
| May 27, 2026 | 1,290 | — |
| May 26, 2026 | 1,330 | — |
| May 25, 2026 | 1,380 | — |
| May 24, 2026 | 1,430 | — |
| May 23, 2026 | 1,490 | — |
| May 22, 2026 | 1,560 | — |
| May 21, 2026 | 1,680 | — |
| May 20, 2026 | 1,760 | — |
| May 19, 2026 | 1,710 | — |
| May 18, 2026 | 1,570 | — |
| May 17, 2026 | 1,450 | — |
| May 16, 2026 | 1,140 | — |
| May 15, 2026 | 1,050 | — |
| Apr 20, 2026 | 2,760 | — |
| Apr 19, 2026 | 3,050 | — |
| Apr 18, 2026 | 3,370 | — |
| Apr 17, 2026 | 3,650 | — |
| Apr 16, 2026 | 3,990 | — |
| Apr 15, 2026 | 3,420 | — |
| Apr 14, 2026 | 2,690 | — |
| Apr 13, 2026 | 2,770 | — |
| Apr 12, 2026 | 2,850 | — |
| Apr 11, 2026 | 3,030 | — |
| Apr 10, 2026 | 3,430 | — |
| Apr 9, 2026 | 3,950 | — |
| Apr 8, 2026 | 4,600 | — |
| Apr 7, 2026 | 5,560 | — |
| Apr 6, 2026 | 6,900 | — |
| Apr 5, 2026 | 7,330 | — |
Station Information
- USGS Site No
- 05462000
- State
- IA
- County
- Butler County
- Coordinates
- 42.7119, -92.5830
- Drainage Area
- 1,746 mi²
- Datum (ft)
- 885.4
- HUC Code
- 07080202
Flood Stage Thresholds
- Action Stage
- 10.0 ft
- Flood Stage
- 12.0 ft
- Moderate Flood
- 18.0 ft
- Major Flood
- 20.0 ft
Currently 3.10 ft below flood stage.
Recent Extremes
- Max discharge
-
12,200 cfsAug 1, 2025
- Min discharge
-
485 cfsDec 14, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
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Cedar River at Waverly, IAHigh6.0 mi · 1,540 cfs
-
West Fork Cedar River at Finchford, IAHigh6.0 mi · 535 cfs
-
Cedar River at Janesville, IAHigh7.4 mi · 1,570 cfs
-
Beaver Creek at New Hartford, IAHigh9.8 mi · 227 cfs
-
Cedar River at Cedar Falls, IANormal14.0 mi · 4,010 cfs