USGS Streamgage 13011820
Blackrock Creek below Split Rock Creek, near Moran, WY
Blackrock Creek below Split Rock Creek, near Moran, WY is USGS streamgage 13011820 in Wyoming, monitoring river discharge in hydrologic subbasin 17040101. It drains a watershed of about 32 square miles. Discharge records at this site go back to 2017. Typical flow runs near 46.1 cfs in July and 14.6 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Wyoming
- Drainage area
- 32 sq mi
- Gauge elevation
- 8,578 ft
- Subbasin (HUC-8)
- 17040101
- Coordinates
- 43.80711, -110.17872
- USGS site number
- 13011820
- Records begin
- 2017-10-27 (9 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 6 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 | — | 6.2 | — | |
| February | — | 5.3 | — | |
| March | — | 5.3 | — | |
| April | — | 14.6 | — | |
| May | — | 161.2 | — | |
| June | — | 279 | — | |
| July | — | 46.1 | — | |
| August | — | 17.6 | — | |
| September | — | 12.8 | — | |
| October | — | 12.7 | — | |
| November | — | 10.7 | — | |
| December | — | 6.9 | — |
All values in cubic feet per second (cfs).
Common questions
- When does Blackrock Creek below Split Rock Creek, near Moran, WY normally run highest?
- June, on the long-term record. The median daily flow that month is about 279 cfs, against 5.3 cfs in February, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- How long has Blackrock Creek below Split Rock Creek, near Moran, WY been measured?
- Discharge records at USGS site 13011820 begin in 2017, about 9 years, covering roughly 3,205 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Blackrock Creek below Split Rock Creek, near Moran, WY?
- The gauge sits at 43.80711, -110.17872, in Wyoming, in hydrologic subbasin 17040101, at an elevation of about 8,578 feet, draining roughly 32 square miles.
- Can I use Blackrock Creek below Split Rock Creek, near Moran, WY 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.