Big Lost River below Mackay Reservoir near Mackay ID
USGS Site No: 13127000 • Big Lost River • Custer County, ID
Big Lost River below Mackay Reservoir near Mackay ID on the Big Lost River is currently at 710 cfs (Normal — 39th percentile for this date) . Gage height: 3.12 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 | 389 | |
| 25th | Low threshold | 550 | |
| 50th (Median) | Normal (median) | 845 | Today: 710 cfs |
| 75th | High threshold | 1,240 | |
| 95th | Very High threshold | 2,150 |
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 | 669 | — |
| May 27, 2026 | 623 | — |
| May 26, 2026 | 529 | — |
| May 25, 2026 | 433 | — |
| May 24, 2026 | 427 | — |
| May 23, 2026 | 428 | — |
| May 22, 2026 | 449 | — |
| May 21, 2026 | 489 | — |
| May 20, 2026 | 512 | — |
| May 19, 2026 | 557 | — |
| May 18, 2026 | 582 | — |
| May 17, 2026 | 631 | — |
| May 16, 2026 | 724 | — |
| May 15, 2026 | 648 | — |
| Apr 20, 2026 | 87 | — |
| Apr 19, 2026 | 86 | — |
| Apr 18, 2026 | 85 | — |
| Apr 17, 2026 | 84 | — |
| Apr 16, 2026 | 83 | — |
| Apr 15, 2026 | 83 | — |
| Apr 14, 2026 | 82 | — |
| Apr 13, 2026 | 81 | — |
| Apr 12, 2026 | 80 | — |
| Apr 11, 2026 | 79 | — |
| Apr 10, 2026 | 78 | — |
| Apr 9, 2026 | 77 | — |
| Apr 8, 2026 | 77 | — |
| Apr 7, 2026 | 76 | — |
| Apr 6, 2026 | 75 | — |
| Apr 5, 2026 | 75 | — |
Station Information
- USGS Site No
- 13127000
- State
- ID
- County
- Custer County
- Coordinates
- 43.9392, -113.6483
- Drainage Area
- 801 mi²
- Datum (ft)
- 5,950.6
- HUC Code
- 17040218
Flood Stage Thresholds
- Action Stage
- 3.8 ft
- Flood Stage
- 4.3 ft
Currently 1.18 ft below flood stage.
Recent Extremes
- Max discharge
-
770 cfsJun 1, 2025
- Min discharge
-
46 cfsNov 25, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Lower Cedar Creek above Divs near Mackay IDNormal4.0 mi · 61 cfs
-
Warm Springs Creek Below Diversion near Mackay IDNormal8.1 mi · 18 cfs
-
Big Lost River near Leslie IDVery High10.6 mi · 449 cfs
-
Thousand Springs Creek near Chilly IDNormal13.0 mi · 6 cfs
-
Antelope Creek near Darlington, IDNormal15.7 mi · 139 cfs