Iowa River at Marengo, IA
USGS Site No: 05453100 • Iowa River • Iowa County, IA
Iowa River at Marengo, IA on the Iowa River is currently at 2,440 cfs (High — 81th percentile for this date) . Gage height: 9.34 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 | 157 | |
| 25th | Low threshold | 263 | |
| 50th (Median) | Normal (median) | 647 | |
| 75th | High threshold | 1,520 | |
| 95th | Very High threshold | 4,420 | Today: 2,440 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 | 2,540 | — |
| May 27, 2026 | 2,610 | — |
| May 26, 2026 | 2,770 | — |
| May 25, 2026 | 2,990 | — |
| May 24, 2026 | 3,220 | — |
| May 23, 2026 | 3,480 | — |
| May 22, 2026 | 3,810 | — |
| May 21, 2026 | 3,950 | — |
| May 20, 2026 | 3,560 | — |
| May 19, 2026 | 3,040 | — |
| May 18, 2026 | 2,200 | — |
| May 17, 2026 | 2,160 | — |
| May 16, 2026 | 2,090 | — |
| May 15, 2026 | 2,110 | — |
| Apr 20, 2026 | 8,600 | — |
| Apr 19, 2026 | 8,580 | — |
| Apr 18, 2026 | 8,240 | — |
| Apr 17, 2026 | 7,880 | — |
| Apr 16, 2026 | 7,870 | — |
| Apr 15, 2026 | 6,960 | — |
| Apr 14, 2026 | 6,770 | — |
| Apr 13, 2026 | 7,740 | — |
| Apr 12, 2026 | 8,770 | — |
| Apr 11, 2026 | 9,360 | — |
| Apr 10, 2026 | 8,950 | — |
| Apr 9, 2026 | 7,870 | — |
| Apr 8, 2026 | 7,560 | — |
| Apr 7, 2026 | 7,310 | — |
| Apr 6, 2026 | 7,050 | — |
| Apr 5, 2026 | 6,630 | — |
Station Information
- USGS Site No
- 05453100
- State
- IA
- County
- Iowa County
- Coordinates
- 41.8127, -92.0648
- Drainage Area
- 2,794 mi²
- Datum (ft)
- 720.5
- HUC Code
- 07080208
Flood Stage Thresholds
- Action Stage
- 13.0 ft
- Flood Stage
- 15.0 ft
- Moderate Flood
- 17.0 ft
- Major Flood
- 19.0 ft
Currently 5.66 ft below flood stage.
Recent Extremes
- Max discharge
-
12,700 cfsJul 31, 2025
- Min discharge
-
759 cfsDec 4, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Big Bear Creek at Ladora, IAHigh7.5 mi · 153 cfs
-
Iowa River Near Belle Plaine, IAHigh11.4 mi · 2,120 cfs
-
Salt Creek Near Elberon, IAHigh16.5 mi · 116 cfs
-
Walnut Creek Near Hartwick, IAHigh16.6 mi · 51 cfs
-
Clear Creek Near Oxford, IAHigh18.0 mi · 36 cfs