Cowlitz River at Castle Rock, WA
USGS Site No: 14243000 • Cowlitz River • Cowlitz County, WA
Cowlitz River at Castle Rock, WA on the Cowlitz River is currently at 5,730 cfs (Normal — 55th percentile for this date) . Gage height: 34.30 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 | 2,220 | |
| 25th | Low threshold | 3,610 | |
| 50th (Median) | Normal (median) | 5,170 | |
| 75th | High threshold | 7,910 | Today: 5,730 cfs |
| 95th | Very High threshold | 14,600 |
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 | 5,960 | — |
| May 27, 2026 | 6,590 | — |
| May 26, 2026 | 6,780 | — |
| May 25, 2026 | 6,320 | — |
| May 24, 2026 | 6,330 | — |
| May 23, 2026 | 6,400 | — |
| May 22, 2026 | 6,500 | — |
| May 21, 2026 | 6,630 | — |
| May 20, 2026 | 7,100 | — |
| May 19, 2026 | 7,350 | — |
| May 18, 2026 | 7,380 | — |
| May 17, 2026 | 8,280 | — |
| May 16, 2026 | 7,710 | — |
| May 15, 2026 | 7,140 | — |
| Apr 20, 2026 | 8,720 | — |
| Apr 19, 2026 | 8,960 | — |
| Apr 18, 2026 | 9,500 | — |
| Apr 17, 2026 | 10,300 | — |
| Apr 16, 2026 | 10,400 | — |
| Apr 15, 2026 | 11,100 | — |
| Apr 14, 2026 | 8,580 | — |
| Apr 13, 2026 | 8,490 | — |
| Apr 12, 2026 | 9,540 | — |
| Apr 11, 2026 | 13,300 | — |
| Apr 10, 2026 | 13,000 | — |
| Apr 9, 2026 | 13,200 | — |
| Apr 8, 2026 | 13,500 | — |
| Apr 7, 2026 | 13,600 | — |
| Apr 6, 2026 | 14,700 | — |
| Apr 5, 2026 | 15,300 | — |
Station Information
- USGS Site No
- 14243000
- State
- WA
- County
- Cowlitz County
- Coordinates
- 46.2748, -122.9146
- Drainage Area
- 2,238 mi²
- Datum (ft)
- 0.0
- HUC Code
- 17080005
Flood Stage Thresholds
- Action Stage
- 46.0 ft
- Flood Stage
- 48.0 ft
- Moderate Flood
- 54.0 ft
- Major Flood
- 57.0 ft
Currently 13.70 ft below flood stage.
Recent Extremes
- Max discharge
-
54,200 cfsDec 9, 2025
- Min discharge
-
2,590 cfsSep 28, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Toutle River at Tower Road Near Silver Lake, WANormal5.4 mi · 1,050 cfs
-
Cowlitz River at Toledo, WAUnknown11.8 mi
-
South Fork Chehalis River Near Wildwood, WAUnknown14.2 mi · 0 cfs
-
Columbia River at Port Westward, Near Quincy, ORVery High14.4 mi · 269,000 cfs
-
Nf Toutle River Below Srs Near Kid Valley, WANormal17.4 mi · 613 cfs