USGS Streamgage 13185000
Boise River near Twin Springs, ID
Boise River near Twin Springs, ID is USGS streamgage 13185000 in Idaho, monitoring river discharge in hydrologic subbasin 17050112. It drains a watershed of about 832 square miles. Discharge records at this site go back to 1871. Typical flow runs near 985 cfs in July and 1,916.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Idaho
- Drainage area
- 832 sq mi
- Subbasin (HUC-8)
- 17050112
- Coordinates
- 43.66806, -115.72528
- USGS site number
- 13185000
- Records begin
- 1871-06-01 (155 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 115 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 | 283.9 | 397.4 | 677.8 | |
| February | 309.9 | 446.8 | 822.2 | |
| March | 427.8 | 732.9 | 1,589.3 | |
| April | 949.8 | 1,916.3 | 3,857.7 | |
| May | 1,830.6 | 3,411.3 | 6,124.5 | |
| June | 1,241 | 2,944 | 5,620.7 | |
| July | 439.6 | 985 | 2,143.2 | |
| August | 273.1 | 430 | 672.1 | |
| September | 253.1 | 350.9 | 488.1 | |
| October | 276.7 | 367 | 513 | |
| November | 291.6 | 395.9 | 630.3 | |
| December | 269.1 | 389.8 | 687.5 |
All values in cubic feet per second (cfs).