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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
06033000 BOULDER RIVER NEAR BOULDER, MT
LOCATION - Lat 46°12'39.71", long 112°05'29.94" referenced to North American Datum of 1983, in SE 1/4 NE 1/4 SW 1/4 sec.03, T.5 N., R.4 W., Jefferson County, MT, Hydrologic Unit 10020006, on left bank 40 ft downstream from county bridge, 1.1 mile downstream from Muskrat Creek, 2.0 mi southeast of Boulder, and at river mile 44.1.
DRAINAGE AREA - 381 mi².
REVISIONS HISTORY - WSP 1279: 1931.
SURFACE-WATER RECORDS
PERIOD OF RECORD - May 1929 to December 1932, March 1934 to September 1972, October 1984 to current year. Monthly discharge only for some periods, published in Water Supply Paper (WSP) 1309.
GAGE - Water-stage recorder. Datum of gage is 4815.57 ft (GNSS RTK Level III survey by Pioneer Technical Services) Gage, referenced to the North American Vertical Datum of 1988 (NAVD88). Prior to January 22, 2025, the datum of the gage was reported as 4,810 ft, referenced to the NAVD88. Prior to May 1, 2013, the datum of the gage was reported as 4,810 ft, referenced to the National Geodetic Vertical Datum of 1929. Prior to Aug. 29, 1946, nonrecording gage at present site and elevation.
REMARKS - Diversions for irrigation occur upstream from station.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of May 22, 1981, reached a discharge of 7,000 ft³/s, gage height, 12.3 ft, from floodmarks.
