USGS Streamgage 06454100
Niobrara River at Agate, Nebr.
Niobrara River at Agate, Nebr. is USGS streamgage 06454100 in Nebraska, monitoring river discharge in hydrologic subbasin 10150002. It sits on the Niobrara River, alongside 4 other gauges Rivermatics tracks on the same river. 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
- State
- Nebraska
- 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).
Common questions
- When does Niobrara River at Agate, Nebr. normally run highest?
- March, on the long-term record. The median daily flow that month is about 21.9 cfs, against 7.6 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Niobrara River at Agate, Nebr.?
- It depends on the month. In January, half of days historically fall near 14 cfs, with the middle 80% of days between 9.6 and 19.2 cfs. The month-by-month table on this page gives the full range.
- How long has Niobrara River at Agate, Nebr. been measured?
- Discharge records at USGS site 06454100 begin in 1957, about 69 years, covering roughly 1,061 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Niobrara River at Agate, Nebr.?
- The gauge sits at 42.42361, -103.79222, in Nebraska, in hydrologic subbasin 10150002, at an elevation of about 4,412 feet, draining roughly 934 square miles.
- Can I use Niobrara River at Agate, Nebr. data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.
Upstream and downstream on the Niobrara River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Niobrara River in full.
- Niobrara River at Agate, Nebr. this page
- Niobrara River near Sparks, Nebr. 7,150 sq mi
- Niobrara River near Verdel, Nebr. 11,580 sq mi
- Niobrara River at Niobrara, Nebr.
- Niobrara River below Soldier Creek near Niobrara, Nebr.