USGS Streamgage 06454100
Niobrara River at Agate, Nebr.
Niobrara River at Agate, Nebr. is USGS streamgage 06454100, monitoring river discharge in hydrologic subbasin 10150002. It drains a watershed of about 934 square miles. Discharge records at this site go back to 1957. Typical flow runs near 7.7 cfs in July and 17.8 cfs in April, with the higher of the two arriving in April.
Gauge details
- Drainage area
- 934 sq mi
- Gauge elevation
- 4,412 ft
- Subbasin (HUC-8)
- 10150002
- Coordinates
- 42.42361, -103.79222
- USGS site number
- 06454100
- Records begin
- 1957-10-01 (69 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 34 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 | 9.6 | 14 | 19.2 | |
| February | 12.9 | 17.9 | 24.3 | |
| March | 14.1 | 21.9 | 32.7 | |
| April | 12.1 | 17.8 | 28.5 | |
| May | 8.2 | 13.4 | 21.5 | |
| June | 5.5 | 8.8 | 17.4 | |
| July | 4 | 7.7 | 14 | |
| August | 4.2 | 7.6 | 11 | |
| September | 4.8 | 8.4 | 13 | |
| October | 5.6 | 10.1 | 15.2 | |
| November | 9.1 | 14 | 18.6 | |
| December | 10.1 | 15.1 | 19.8 |
All values in cubic feet per second (cfs).