USGS Water-Year Summary 2023
06019500 RUBY RIVER ABOVE RESERVOIR, NEAR ALDER, MT
LOCATION - Lat 45°11'32.35", long 112°08'34.14" referenced to North American Datum of 1983, in NW 1/4 SE 1/4 SW 1/4 sec.30, T.7 S., R.4 W., Madison County, MT, Hydrologic Unit 10020003, on right bank at county road bridge, 0.7 mi downstream from Mormon Creek, 4.2 mi upstream from Ruby Dam, 9.3 mi south of Alder, and at river mile 52.1.
DRAINAGE AREA - 534 mi².
REVISIONS HISTORY - WSP 1309: 1938, maximum discharge. WSP 1559: Drainage area. Discharge and maximum discharge for water year 2017 was revised for the periods May 10-14, 2017 and May 25, 2017, were revised on June 18, 2019, based on changes to the stage-discharge rating.
SURFACE-WATER RECORDS
PERIOD OF RECORD - May 1938 to current year; seasonal record for water year 2007. Monthly discharge only for May 1938, published in Water Supply Paper (WSP) 1309.
GAGE - Water-stage recorder. Elevation of gage is 5,400 ft, referenced to the North American Vertical Datum of 1988. Prior to Oct. 1, 1938, nonrecording gage was located at bridge 2.0 mi upstream at different elevation. Oct. 1, 1938, to Aug. 5, 1955, water-stage recorder was located at site 2.2 mi upstream at a different elevation. Aug. 6, 1955 to Sept. 30, 1997, water-stage recorder was located 2.3 mi upstream at a different elevation.
