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Water-Year Summary for Site 06090300

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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Available Parameters
00060 Discharge(Mean)  

Water year 2021: 2021-10-01 to 2022-09-30

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USGS Water-Year Summary 2021
LOCATION - Lat 47°35'04.00", long 111°03'38.09" referenced to North American Datum of 1983, in SW 1/4 SE 1/4 SW 1/4 sec.11, T.21 N., R.5 E., Cascade County, MT, Hydrologic Unit 10030102, on left bank 700 ft downstream from Morony Dam, 12.6 mi northeast of Great Falls, and at river mile 2,105.4.
DRAINAGE AREA - 22,881 mi².
REVISIONS HISTORY - WDR MT-2014: Drainage area.
PERIOD OF RECORD - May to July 1953 in Water Supply Paper 1320-B, October 1956 to current year.
GAGE - Water-stage recorder. Elevation of gage is 2,807.21 ft, referenced to the National Geodetic Vertical Datum of 1929. Prior to July 27, 1977, nonrecording gage at same site at elevation 2.00 ft higher. July 27, 1977 to May 26, 1987, at site 600 ft upstream at elevation 2.00 ft higher. October 1971 to July 27, 1977, discharges were obtained from the Montana Power Company at Rainbow Dam 7.05 mi upstream. Prior to October 1971, Foxboro meters were used for determining discharge through powerplant. Water-stage recorder on Morony Reservoir was used for determining head on taintor gates with elevation of gage at sea level (level by Montana Power Company).
10-15-2019 to 11-18-2020: records are good.
10-19-2018 to 10-14-2019: records are good. 
10-24-2017 to 10-18-2018: records are good. 
10-11-2016 to 10-23-2017: records are good.
10-21-2015 to 10-10-2016: records are good.
11-05-2014 to 10-20-2015: records are good.
10-01-2013 to 11-04-2014: records are good.
Flow is regulated by Clark Canyon Reservoir (station number 06015300), Canyon Ferry Lake (station 
number 06058500), and 18 smaller irrigation reservoirs and powerplants upstream.  Diversions for 
irrigation include about 750,400 acres upstream from the station.


EXTREMES FOR PERIOD OF RECORD - Maximum peak flow from hydrographic comparison with nearby stations. Instantaneous low flow occurred around the time of a powerplant shutdown.