USGS Streamgage 13190500
SF Boise River at Anderson Ranch Dam, ID
SF Boise River at Anderson Ranch Dam, ID is USGS streamgage 13190500 in Idaho, monitoring river discharge in hydrologic subbasin 17050113. It drains a watershed of about 978 square miles. Discharge records at this site go back to 1943. Typical flow runs near 1,514.2 cfs in July and 770.1 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Idaho
- Drainage area
- 978 sq mi
- Subbasin (HUC-8)
- 17050113
- Coordinates
- 43.34361, -115.4775
- USGS site number
- 13190500
- Records begin
- 1943-04-08 (83 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 83 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 | 190.2 | 308.5 | 1,070.1 | |
| February | 161 | 306.8 | 1,287.5 | |
| March | 132.5 | 306.7 | 1,578.4 | |
| April | 135.1 | 770.1 | 2,675.7 | |
| May | 505.2 | 1,601.9 | 4,299 | |
| June | 678.6 | 1,815.7 | 4,020.7 | |
| July | 932.3 | 1,514.2 | 1,992.9 | |
| August | 411.6 | 1,178.3 | 1,704.2 | |
| September | 207.8 | 464.7 | 1,258.1 | |
| October | 131 | 301.2 | 693 | |
| November | 180.7 | 303.4 | 729.5 | |
| December | 211.7 | 308.4 | 1,036.6 |
All values in cubic feet per second (cfs).