USGS Streamgage 06600100
Floyd River at Alton, IA
Floyd River at Alton, IA is USGS streamgage 06600100, monitoring river discharge in hydrologic subbasin 10230002. It drains a watershed of about 268 square miles. Discharge records at this site go back to 1953. Typical flow runs near 49.8 cfs in July and 87.7 cfs in April, with the higher of the two arriving in April.
Gauge details
- Drainage area
- 268 sq mi
- Gauge elevation
- 1,278 ft
- Subbasin (HUC-8)
- 10230002
- Coordinates
- 42.98281, -96.00033
- USGS site number
- 06600100
- Records begin
- 1953-06-01 (73 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 71 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 | 0.6 | 12.2 | 83.9 | |
| February | 0.4 | 19.1 | 144.7 | |
| March | 5.2 | 58 | 448.5 | |
| April | 9.6 | 87.7 | 406.8 | |
| May | 9.7 | 92.4 | 416.5 | |
| June | 10 | 102.5 | 542.4 | |
| July | 4.9 | 49.8 | 264.7 | |
| August | 2.4 | 20.3 | 128.3 | |
| September | 1.3 | 14.2 | 117.7 | |
| October | 2 | 17.2 | 188.5 | |
| November | 2.4 | 19.3 | 139.2 | |
| December | 1.7 | 16.7 | 113.6 |
All values in cubic feet per second (cfs).