USGS Water-Year Summary for Site 06730500

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	Available Parameters
	00060 Discharge(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

06730500 BOULDER CREEK AT MOUTH NEAR LONGMONT, CO

LOCATION - Lat 40°08'19.6", long 105°01'12.8" referenced to North American Datum of 1983, in NW 1/4 SW 1/4 sec.17, T.2 N., R.68 W., Weld County, CO, Hydrologic Unit 10190005, on left bank at County Road 20.5, 1.6 mi upstream from mouth, and 4.8 mi southeast of Longmont.

DRAINAGE AREA - 447 mi².

REVISIONS HISTORY - WDR-US-2011: Drainage area. May 2014: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - March 1927 to September 1949, May 1951 to September 1955, October 1978 to September 1990, October 1991 to current year.

GAGE - Water-stage recorder with satellite telemetry. Elevation of gage is 4,880 ft above NGVD of 1929, from topographic map. Prior to June 10, 1939, at site 0.2 mi downstream at different datum. June 10, 1939 to Sept. 30, 1949, at same site, at different datum. May 1, 1951 to Sept. 30, 1955, at site 0.4 mi upstream, at different datum. Oct. 1, 1978 to May 20, 2014, at site 1.0 mi downstream, at different datum. Crest-stage gage removed prior to construction in August 2014.

REMARKS - Water year 2014; records good except for estimated daily discharges, which are poor. Water year 2015; records good except for estimated daily discharges, which are poor. Water year 2016; records good except for estimated daily discharges, which are poor. Water year 2017; records good except for estimated daily discharges, which are poor. Water year 2018; records good except for estimated daily discharges, which are poor. Water year 2019; records good except for the period July 27 to Sept. 5, which is fair, and estimated daily discharges, which are poor. Water year 2020; records good except for the period Aug. 28 to Sept. 30, which is fair, and estimated daily discharges, which are poor. Water year 2021; records good except for estimated daily discharges, which are poor. Water year 2022; records good except for flows above 400 ft³/s, which are fair, and estimated daily discharges, which are poor. Water year 2023; records good except for estimated daily discharges, which are poor. Natural flow of stream affected by transmountain, transbasin, and storage diversions, diversions for irrigation, water-treatment plants, and return flows from irrigated areas.