USGS Water-Year Summary for Site 06730200

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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

06730200 BOULDER CREEK AT NORTH 75TH STREET NEAR BOULDER, CO

LOCATION - Lat 40°03'06", long 105°10'42" referenced to North American Datum of 1927, in SE 1/4 NW 1/4 sec.13, T.1 N., R.70 W., Boulder County, CO, Hydrologic Unit 10190005, on left bank 30 ft upstream from bridge on North 75th Street, 0.2 mi downstream from Boulder feeder ditch, and 6 mi northeast of Boulder.

DRAINAGE AREA - 307 mi².

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

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1986 to current year.

GAGE - Water-stage recorder with satellite telemetry, crest-stage gage, and grouted rock control. Elevation of gage is 5,106 ft above NGVD of 1929, from topographic map. From Apr. 14, 2003 to Apr. 6, 2006, at site 100 ft downstream at same datum. On Apr. 7, 2006, gage returned to prior location 30 ft upstream from bridge on North 75th street, and 100 ft upstream from City of Lafayette diversion.

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 estimated daily discharges, which are poor. Water year 2020; no estimated daily discharges. Records good. Water year 2021; records good except for estimated daily discharges, which are poor. Water year 2022; records good except for estimated daily discharges, which are poor. Water year 2023; records good except for estimated daily discharges, which are poor. Flow is partially regulated by Barker Reservoir, and affected by Boulder feeder ditch, Boulder sewage treatment plant, and Public Service power plant. Starting about Feb. 2003, Boulder Sewage Treatment Plant moved its wastewater discharge point to site about 400 ft downstream from current gage location and the City of Lafayette began diversions upstream from gage. Apr. 7, 2006, gage was returned to prior location 30 ft upstream from bridge on North 75th Street, and 100 ft upstream from City of Lafayette diversion.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 8,400 ft³/s, Sept. 13, 2013, from indirect measurement of peak flow, gage height, 10.60 ft, from high-water mark.