Big Lost River at Howell Ranch near Chilly ID
USGS Site No: 13120500 • Big Lost River • Custer County, ID
Big Lost River at Howell Ranch near Chilly ID on the Big Lost River is currently at 1,130 cfs (Very High — 144th percentile for this date) . Gage height: 2.95 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 | 70 | |
| 25th | Low threshold | 85 | |
| 50th (Median) | Normal (median) | 115 | |
| 75th | High threshold | 142 | |
| 95th | Very High threshold | 190 |
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 | 1,220 | — |
| May 27, 2026 | 1,140 | — |
| May 26, 2026 | 1,050 | — |
| May 25, 2026 | 859 | — |
| May 24, 2026 | 693 | — |
| May 23, 2026 | 596 | — |
| May 22, 2026 | 587 | — |
| May 21, 2026 | 591 | — |
| May 20, 2026 | 607 | — |
| May 19, 2026 | 661 | — |
| May 18, 2026 | 754 | — |
| May 17, 2026 | 883 | — |
| May 16, 2026 | 1,030 | — |
| May 15, 2026 | 1,190 | — |
| Apr 20, 2026 | 283 | — |
| Apr 19, 2026 | 288 | — |
| Apr 18, 2026 | 288 | — |
| Apr 17, 2026 | 294 | — |
| Apr 16, 2026 | 341 | — |
| Apr 15, 2026 | 350 | — |
| Apr 14, 2026 | 364 | — |
| Apr 13, 2026 | 398 | — |
| Apr 12, 2026 | 432 | — |
| Apr 11, 2026 | 426 | — |
| Apr 10, 2026 | 387 | — |
| Apr 9, 2026 | 353 | — |
| Apr 8, 2026 | 332 | — |
| Apr 7, 2026 | 307 | — |
| Apr 6, 2026 | 289 | — |
| Apr 5, 2026 | 289 | — |
Station Information
- USGS Site No
- 13120500
- State
- ID
- County
- Custer County
- Coordinates
- 43.9983, -114.0211
- Drainage Area
- 440 mi²
- Datum (ft)
- 6,626.3
- HUC Code
- 17040218
Flood Stage Thresholds
- Action Stage
- 3.5 ft
- Flood Stage
- 4.1 ft
Currently 1.10 ft below flood stage.
Recent Extremes
- Max discharge
-
1,410 cfsJun 1, 2025
- Min discharge
-
61 cfsDec 20, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Nf Big Lost River at Wild Horse near Chilly IDVery High6.5 mi · 335 cfs
-
Thousand Springs Creek near Chilly IDNormal10.1 mi · 6 cfs
-
Warm Springs Creek Below Diversion near Mackay IDLow11.1 mi · 18 cfs
-
Big Lost River below Mackay Reservoir near Mackay IDVery High19.0 mi · 710 cfs
-
Lower Cedar Creek above Divs near Mackay IDVery High22.1 mi · 61 cfs