Rock River at Afton, WI
USGS Site No: 05430500 • Rock River • Rock County, WI
Rock River at Afton, WI on the Rock River is currently at 2,680 cfs (High — 81th percentile for this date) . Gage height: 5.36 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 | 396 | |
| 25th | Low threshold | 704 | |
| 50th (Median) | Normal (median) | 1,330 | |
| 75th | High threshold | 2,010 | |
| 95th | Very High threshold | 4,200 | Today: 2,680 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 | 2,750 | — |
| May 27, 2026 | 2,490 | — |
| May 26, 2026 | 2,400 | — |
| May 25, 2026 | 2,980 | — |
| May 24, 2026 | 3,210 | — |
| May 23, 2026 | 3,320 | — |
| May 22, 2026 | 3,470 | — |
| May 21, 2026 | 3,710 | — |
| May 20, 2026 | 3,900 | — |
| May 19, 2026 | 4,050 | — |
| May 18, 2026 | 4,240 | — |
| May 17, 2026 | 4,450 | — |
| May 16, 2026 | 4,620 | — |
| May 15, 2026 | 4,810 | — |
| Apr 20, 2026 | 9,210 | — |
| Apr 19, 2026 | 9,240 | — |
| Apr 18, 2026 | 10,900 | — |
| Apr 17, 2026 | 8,390 | — |
| Apr 16, 2026 | 7,060 | — |
| Apr 15, 2026 | 6,020 | — |
| Apr 14, 2026 | 5,300 | — |
| Apr 13, 2026 | 4,780 | — |
| Apr 12, 2026 | 4,640 | — |
| Apr 11, 2026 | 4,650 | — |
| Apr 10, 2026 | 4,620 | — |
| Apr 9, 2026 | 4,370 | — |
| Apr 8, 2026 | 4,250 | — |
| Apr 7, 2026 | 4,260 | — |
| Apr 6, 2026 | 4,120 | — |
| Apr 5, 2026 | 4,010 | — |
Station Information
- USGS Site No
- 05430500
- State
- WI
- County
- Rock County
- Coordinates
- 42.6136, -89.0717
- Drainage Area
- 3,340 mi²
- Datum (ft)
- 750.0
- HUC Code
- 07090002
Flood Stage Thresholds
- Action Stage
- 8.0 ft
- Flood Stage
- 9.0 ft
- Moderate Flood
- 11.1 ft
- Major Flood
- 12.2 ft
Currently 3.64 ft below flood stage.
Recent Extremes
- Max discharge
-
10,900 cfsApr 18, 2026
- Min discharge
-
1,060 cfsNov 13, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Rock River at Rockton, ILNormal11.3 mi · 4,690 cfs
-
Pecatonica River near Shirland, IllNormal13.2 mi · 1,380 cfs
-
Rock River at Newville, WIVery High15.2 mi · 2,100 cfs
-
Rock River at Fort Atkinson, WINormal24.8 mi · 1,710 cfs
-
Kishwaukee River at Belvidere, ILNormal26.9 mi · 233 cfs