USGS Streamgage 12500450
Yakima River above Ahtanum Creek at Union Gap, WA
Yakima River above Ahtanum Creek at Union Gap, WA is USGS streamgage 12500450 in Washington, monitoring river discharge in hydrologic subbasin 17030003. It drains a watershed of about 3,479 square miles. Discharge records at this site go back to 1966. Typical flow runs near 3,469.4 cfs in July and 4,114.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 3,479 sq mi
- Gauge elevation
- 943 ft
- Subbasin (HUC-8)
- 17030003
- Coordinates
- 46.53426, -120.46725
- USGS site number
- 12500450
- Records begin
- 1966-10-01 (60 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 60 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 | 1,085.7 | 2,272.6 | 5,826.8 | |
| February | 1,310.7 | 2,467.6 | 6,955.2 | |
| March | 1,521.3 | 2,977.7 | 7,378.4 | |
| April | 2,093.3 | 4,114.3 | 8,838.3 | |
| May | 2,821.9 | 5,341 | 11,683.9 | |
| June | 2,798.7 | 4,537.7 | 10,134.3 | |
| July | 2,835.5 | 3,469.4 | 4,976.8 | |
| August | 2,741.6 | 3,320.6 | 3,764.2 | |
| September | 2,139.3 | 2,587.7 | 3,056.3 | |
| October | 1,197.5 | 1,720 | 2,290.6 | |
| November | 1,043.3 | 1,722.3 | 3,416.7 | |
| December | 1,098.4 | 1,877.1 | 5,553.2 |
All values in cubic feet per second (cfs).