USGS Streamgage 06404800
Grace Coolidge Creek near Hayward, SD
Grace Coolidge Creek near Hayward, SD is USGS streamgage 06404800 in South Dakota, monitoring river discharge in hydrologic subbasin 10120109. It sits on the Grace Coolidge Creek, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 7 square miles. Discharge records at this site go back to 1988. Typical flow runs near 2.2 cfs in July and 1.5 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- South Dakota
- Drainage area
- 7 sq mi
- Gauge elevation
- 4,776 ft
- Subbasin (HUC-8)
- 10120109
- Coordinates
- 43.80206, -103.43431
- USGS site number
- 06404800
- Records begin
- 1988-12-09 (38 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 9 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 | 0.1 | 0.4 | 1.1 | |
| February | 0.1 | 0.3 | 1.1 | |
| March | 0.2 | 0.7 | 1.7 | |
| April | 0.4 | 1.5 | 4.9 | |
| May | 0.4 | 5.1 | 44.8 | |
| June | 0.5 | 6.8 | 31.9 | |
| July | 0.3 | 2.2 | 5.6 | |
| August | 0.3 | 1.4 | 3.9 | |
| September | 0.2 | 0.9 | 1.9 | |
| October | 0.2 | 0.9 | 3.3 | |
| November | 0.2 | 0.7 | 3 | |
| December | 0.1 | 0.5 | 1.2 |
All values in cubic feet per second (cfs).
Common questions
- When does Grace Coolidge Creek near Hayward, SD normally run highest?
- June, on the long-term record. The median daily flow that month is about 6.8 cfs, against 0.3 cfs in February, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Grace Coolidge Creek near Hayward, SD?
- It depends on the month. In January, half of days historically fall near 0.4 cfs, with the middle 80% of days between 0.1 and 1.1 cfs. The month-by-month table on this page gives the full range.
- How long has Grace Coolidge Creek near Hayward, SD been measured?
- Discharge records at USGS site 06404800 begin in 1988, about 38 years. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Grace Coolidge Creek near Hayward, SD?
- The gauge sits at 43.80206, -103.43431, in South Dakota, in hydrologic subbasin 10120109, at an elevation of about 4,776 feet, draining roughly 7 square miles.
- Can I use Grace Coolidge Creek near Hayward, SD 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 Grace Coolidge Creek
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Grace Coolidge Creek in full.
- Grace Coolidge Creek near Hayward, SD this page
- Grace Coolidge Creek near Game Lodge near Custer, SD 27 sq mi