Charles River at Waltham, MA
USGS Site No: 01104500 • Charles River • Middlesex County, MA
Charles River at Waltham, MA on the Charles River is currently at 119 cfs (Low — 23th percentile for this date) . Gage height: 1.28 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for June 11 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 | 96 | |
| 25th | Low threshold | 122 | Today: 119 cfs |
| 50th (Median) | Normal (median) | 187 | |
| 75th | High threshold | 310 | |
| 95th | Very High threshold | 978 |
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 | 115 | — |
| May 27, 2026 | 111 | — |
| May 26, 2026 | 117 | — |
| May 25, 2026 | 124 | — |
| May 24, 2026 | 115 | — |
| May 23, 2026 | 113 | — |
| May 22, 2026 | 113 | — |
| May 21, 2026 | 113 | — |
| May 20, 2026 | 128 | — |
| May 19, 2026 | 134 | — |
| May 18, 2026 | 126 | — |
| May 17, 2026 | 134 | — |
| May 16, 2026 | 141 | — |
| May 15, 2026 | 149 | — |
| Apr 21, 2026 | 267 | — |
| Apr 20, 2026 | 272 | — |
| Apr 19, 2026 | 275 | — |
| Apr 18, 2026 | 277 | — |
| Apr 17, 2026 | 286 | — |
| Apr 16, 2026 | 287 | — |
| Apr 15, 2026 | 277 | — |
| Apr 14, 2026 | 306 | — |
| Apr 13, 2026 | 322 | — |
| Apr 12, 2026 | 339 | — |
| Apr 11, 2026 | 366 | — |
| Apr 10, 2026 | 419 | — |
| Apr 9, 2026 | 450 | — |
| Apr 8, 2026 | 465 | — |
| Apr 7, 2026 | 481 | — |
| Apr 6, 2026 | 490 | — |
Station Information
- USGS Site No
- 01104500
- State
- MA
- County
- Middlesex County
- Coordinates
- 42.3723, -71.2337
- Drainage Area
- 251 mi²
- Datum (ft)
- 19.2
- HUC Code
- 01090001
Flood Stage Thresholds
- Action Stage
- 4.0 ft
- Flood Stage
- 5.0 ft
- Moderate Flood
- 7.0 ft
- Major Flood
- 9.0 ft
Currently 3.72 ft below flood stage.
Recent Extremes
- Max discharge
-
986 cfsMar 17, 2026
- Min discharge
-
7 cfsAug 28, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Stony Brook, Unnamed Tributary 1, Near Waltham, MALow1.9 mi · 0 cfs
-
Stony Brook at Rt 20 at Waltham, MANormal1.9 mi · 18 cfs
-
Stony Brook Reservoir at Dam Near Waltham, MAVery Low2.0 mi · 0 cfs
-
Stony Brook Unnamed Tributary 2 near Weston StationNormal2.1 mi · 7 cfs
-
Stony Brook Reservoir., Unnamed Tributary 1, Near Weston, MALow2.1 mi · 0 cfs