Upper Iowa River at Decorah, IA
USGS Site No: 05387500 • Upper Iowa River • Winneshiek County, IA
Upper Iowa River at Decorah, IA on the Upper Iowa River is currently at 363 cfs (High — 76th percentile for this date) . Gage height: 2.04 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 | 67 | |
| 25th | Low threshold | 96 | |
| 50th (Median) | Normal (median) | 146 | |
| 75th | High threshold | 337 | |
| 95th | Very High threshold | 921 | Today: 363 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 | 361 | — |
| May 27, 2026 | 382 | — |
| May 26, 2026 | 393 | — |
| May 25, 2026 | 416 | — |
| May 24, 2026 | 439 | — |
| May 23, 2026 | 461 | — |
| May 22, 2026 | 483 | — |
| May 21, 2026 | 508 | — |
| May 20, 2026 | 513 | — |
| May 19, 2026 | 479 | — |
| May 18, 2026 | 460 | — |
| May 17, 2026 | 432 | — |
| May 16, 2026 | 414 | — |
| May 15, 2026 | 383 | — |
| Apr 20, 2026 | 1,020 | — |
| Apr 19, 2026 | 1,130 | — |
| Apr 18, 2026 | 1,220 | — |
| Apr 17, 2026 | 1,350 | — |
| Apr 16, 2026 | 1,450 | — |
| Apr 15, 2026 | 1,230 | — |
| Apr 14, 2026 | 1,020 | — |
| Apr 13, 2026 | 967 | — |
| Apr 12, 2026 | 1,010 | — |
| Apr 11, 2026 | 1,060 | — |
| Apr 10, 2026 | 1,210 | — |
| Apr 9, 2026 | 1,410 | — |
| Apr 8, 2026 | 1,640 | — |
| Apr 7, 2026 | 1,950 | — |
| Apr 6, 2026 | 2,450 | — |
| Apr 5, 2026 | 2,860 | — |
Station Information
- USGS Site No
- 05387500
- State
- IA
- County
- Winneshiek County
- Coordinates
- 43.3049, -91.7955
- Drainage Area
- 511 mi²
- Datum (ft)
- 850.1
- HUC Code
- 07060002
Flood Stage Thresholds
- Action Stage
- 9.0 ft
- Flood Stage
- 12.0 ft
- Moderate Flood
- 13.0 ft
- Major Flood
- 14.0 ft
Currently 9.96 ft below flood stage.
Recent Extremes
- Max discharge
-
7,930 cfsAug 18, 2025
- Min discharge
-
131 cfsDec 5, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Upper Iowa River at Bluffton, IANormal8.8 mi · 280 cfs
-
Turkey River at Spillville, IAHigh10.3 mi · 107 cfs
-
Upper Iowa River Near Dorchester, IAHigh16.5 mi · 613 cfs
-
Turkey River Near Eldorado, IANormal17.3 mi · 383 cfs
-
Yellow River Near Ion, IAHigh29.9 mi · 193 cfs