USGS Streamgage 13127000
Big Lost River below Mackay Reservoir near Mackay, ID
Big Lost River below Mackay Reservoir near Mackay, ID is USGS streamgage 13127000 in Idaho, monitoring river discharge in hydrologic subbasin 17040218. It drains a watershed of about 801 square miles. Discharge records at this site go back to 1903. Typical flow runs near 607.1 cfs in July and 123.5 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Idaho
- Drainage area
- 801 sq mi
- Subbasin (HUC-8)
- 17040218
- Coordinates
- 43.93917, -113.64833
- USGS site number
- 13127000
- Records begin
- 1903-12-01 (123 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 121 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 76.1 | 103.7 | 191 | |
| February | 87.4 | 114.1 | 184.3 | |
| March | 94.7 | 122.1 | 203.1 | |
| April | 95.7 | 123.5 | 284.5 | |
| May | 157.2 | 380.9 | 907.6 | |
| June | 406.1 | 800 | 1,662 | |
| July | 290.8 | 607.1 | 1,017.5 | |
| August | 156.7 | 386.4 | 649.5 | |
| September | 136.1 | 208 | 371.9 | |
| October | 77 | 146 | 270.8 | |
| November | 50.3 | 76.6 | 203.1 | |
| December | 59.9 | 87.8 | 193.3 |
All values in cubic feet per second (cfs).
Other gauges in this subbasin
- Lower Cedar Creek Ab Divs near Mackay, ID
- Big Lost River near Leslie, ID
- Antelope Creek near Darlington, ID
- Big Lost River below Moore Diversion near Moore, ID
- Big Lost River at Arco at Sunset Road, ID
- Big Lost River near Arco, ID
- Inl Diversion at Head near Arco, ID
- Big Lost River below Inl Diversion near Arco, ID