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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
12105900 GREEN RIVER BELOW HOWARD A. HANSON RESERVOIR, WA
LOCATION - Lat 47°17'02", long 121°47'48" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 sec.28, T.21 N., R.8 E., King County, WA, Hydrologic Unit 17110013, on right bank 0.7 mi upstream from Bear Creek, 0.7 mi downstream from Howard A. Hanson Dam, 5.0 mi southeast of Palmer, and at mile 63.8.
DRAINAGE AREA - 221 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1960 (monthly discharge only), November 1960 to current year.
GAGE - Water-stage recorder. Elevation of gage is 990 ft above NGVD of 1929, from topographic map and 980.53 ft above NAVD of 1988 (differential levels using NGS BM PID SX0976).
REMARKS - Flow regulated by Howard A. Hanson Reservoir (station 12105800) for flood control and during summer months to augment the natural river flow.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 12,200 ft³/s, Feb. 21, 1961, gage height, 14.40 ft; minimum discharge, 87 ft³/s, Dec. 29, 1961, Jan. 7, 2009.
