USGS Streamgage 06186500
Yellowstone River at Yellowstone Lake Outlet YNP
Yellowstone River at Yellowstone Lake Outlet YNP is USGS streamgage 06186500 in Wyoming, monitoring river discharge in hydrologic subbasin 10070001. It drains a watershed of about 995 square miles. Discharge records at this site go back to 1923. Typical flow runs near 3,802.6 cfs in July and 544.1 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Wyoming
- Drainage area
- 995 sq mi
- Gauge elevation
- 7,736 ft
- Subbasin (HUC-8)
- 10070001
- Coordinates
- 44.56709, -110.38041
- USGS site number
- 06186500
- Records begin
- 1923-07-06 (103 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 100 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 | 223.5 | 375.6 | 580.9 | |
| February | 206.6 | 387.7 | 569.6 | |
| March | 266 | 452.5 | 609.8 | |
| April | 409 | 544.1 | 714.2 | |
| May | 697.3 | 1,130.4 | 1,885.3 | |
| June | 2,269.7 | 3,587.3 | 5,640.7 | |
| July | 2,234.2 | 3,802.6 | 6,014.5 | |
| August | 1,194.7 | 2,048.7 | 3,110 | |
| September | 733.7 | 1,114.2 | 1,697.7 | |
| October | 533.5 | 744.9 | 1,095.5 | |
| November | 400.2 | 594.7 | 807 | |
| December | 292.9 | 463 | 650.9 |
All values in cubic feet per second (cfs).