USGS Streamgage 13120000
NF Big Lost River at Wild Horse near Chilly, ID
NF Big Lost River at Wild Horse near Chilly, ID is USGS streamgage 13120000 in Idaho, monitoring river discharge in hydrologic subbasin 17040218. It drains a watershed of about 115 square miles. Discharge records at this site go back to 1944. Typical flow runs near 168.6 cfs in July and 46.8 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Idaho
- Drainage area
- 115 sq mi
- Subbasin (HUC-8)
- 17040218
- Coordinates
- 43.93278, -114.11389
- USGS site number
- 13120000
- Records begin
- 1944-04-01 (82 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 81 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 | 16.7 | 21.9 | 29.8 | |
| February | 15.9 | 20.2 | 26.1 | |
| March | 15.7 | 20.3 | 31.5 | |
| April | 23.6 | 46.8 | 121.5 | |
| May | 95 | 226.9 | 510.2 | |
| June | 167.4 | 357.7 | 703.2 | |
| July | 65.7 | 168.6 | 321 | |
| August | 32.1 | 58.5 | 111.4 | |
| September | 23.9 | 39 | 64.8 | |
| October | 22.7 | 35.3 | 53.3 | |
| November | 19.4 | 29 | 40 | |
| December | 17 | 23.4 | 32.2 |
All values in cubic feet per second (cfs).
Other gauges in this subbasin
- Big Lost River at Howell Ranch near Chilly, ID
- Thousand Springs Creek near Chilly, ID
- Warm Springs Creek below Diversion near Mackay, ID
- Big Lost River below Mackay Reservoir near Mackay, ID
- 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