USGS Streamgage 12105900
Green River below Howard A Hanson Dam, WA
Green River below Howard A Hanson Dam, WA is USGS streamgage 12105900 in Washington, monitoring river discharge in hydrologic subbasin 17110013. It drains a watershed of about 221 square miles. Discharge records at this site go back to 1960. Typical flow runs near 340.7 cfs in July and 1,152.7 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 221 sq mi
- Gauge elevation
- 1,032 ft
- Subbasin (HUC-8)
- 17110013
- Coordinates
- 47.28371, -121.79788
- USGS site number
- 12105900
- Records begin
- 1960-10-01 (66 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 66 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 | 485.8 | 1,073 | 3,704.8 | |
| February | 474.3 | 988 | 3,063.8 | |
| March | 456.9 | 917.6 | 2,128.1 | |
| April | 561.3 | 1,152.7 | 2,281 | |
| May | 421.8 | 1,112.5 | 2,339.4 | |
| June | 279.6 | 624.8 | 1,538.5 | |
| July | 234.2 | 340.7 | 712.3 | |
| August | 216.7 | 256.9 | 349 | |
| September | 220.6 | 299.7 | 514 | |
| October | 225.5 | 452.3 | 1,184 | |
| November | 354.8 | 904.5 | 2,795 | |
| December | 442.1 | 992 | 3,211.6 |
All values in cubic feet per second (cfs).
Other gauges in this subbasin
- Green River at Purification Plant near Palmer, WA
- Newaukum Creek near Black Diamond, WA
- Green River below Crisp Creek near Black Diamond, WA
- Big Soos Creek above Hatchery near Auburn, WA
- Green River near Auburn, WA
- Green River above S 277Th St at Kent, WA
- Green River below Meeker St at Kent, WA
- Green River at 200Th Street at Kent, WA