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USGS Water-Year Summary 2024
12106700 GREEN RIVER AT PURIFICATION PLANT, NEAR PALMER, WA
LOCATION - Lat 47°18'19", long 121°50'58" referenced to North American Datum of 1927, in NE 1/4 SE 1/4 sec.13, T.21 N., R.7 E., King County, WA, Hydrologic Unit 17110013, on left bank at former City of Tacoma purification plant (now called Old Headworks Building), approximately 1 mile upstream from current City of Tacoma purification plant 0.7 mi downstream from diversion dam, 2 mi southeast of Palmer, and at mile 60.3.
DRAINAGE AREA - 231 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - July 1963 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 859.53 ft above NGVD of 1929 and 863.14 ft above NAVD of 1988 (NGS monumented benchmark). Prior to Oct. 1, 1987, water-stage recorder at site 0.1 mi upstream at same datum.
REMARKS -
Since Dec. 5, 1961, flow regulated by Howard A. Hanson Reservoir (station 12105800), 4.1 mi upstream for flood control and during summer months to augment the natural river flow. U.S. Geological Survey satellite telemeter at station. City of Tacoma diverts flow upstream from station for municipal supply, of which a small amount is returned to the river 300 ft upstream from station.
City of Tacoma diverted the following average daily discharges from river at headworks near Palmer, 50.6 mi upstream from station, for municipal use:
| Water Year | Discharge (cfs) |
Water Year | Discharge (cfs) |
Water Year | Discharge (cfs) |
Water Year | Discharge (cfs) |
| 2014 | 59.4 | 2015 | 69.7 | 2016 | 90.2 | 2017 | 95.6 |
| 2018 | 90.3 | 2019 | 96.5 | 2020 | 92.4 | 2021 | 95.0 |
| 2022 | 96.0 | 2023 | 95.8 |
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Nov. 23, 1959, had a discharge of 27,800 ft³/s, on basis of slope-area measurement at site 0.5 mi downstream from present gage.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 12,500 ft³/s, Feb. 12, 1981, gage height, 12.05 ft, at site then in use; minimum discharge, 20 ft³/s, part or all of each day, Oct. 26, 27, Nov. 3, 4, 6, 1974, gage height, 3.90 ft, at site then in use, but may have been less during period affected by landslide downstream on Jan. 7.
