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USGS Water-Year Summary 2024
11161000 San Lorenzo River at Santa Cruz, CA
LOCATION - Lat 36°59'27", long 122°01'51" referenced to North American Datum of 1927, Santa Cruz County, CA, Hydrologic Unit 18060015, in La Carbonera Grant, on right bank, in city of Santa Cruz Water Meter Repair compound, 0.3 mi upstream from bridge at intersection of State Highways 1 and 9, 1.0 mi north of Santa Cruz, and 2.4 mi upstream from mouth.
DRAINAGE AREA - 115 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1952 to September 1960, October 1987 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 8.72 ft above NAVD of 1988 and 5.84 ft above NGVD of 1929. October 1952 to September 1960, water-stage recorder at site 0.1 mi downstream at different datum.
REMARKS - Low flow partially regulated by Loch Lomond Reservoir since 1961, capacity, 8,820 acre-ft, and by an inflatable fiber dam located 6.8 mi upstream from gage. Water is diverted 50 ft upstream from station by city of Santa Cruz for municipal supply; many small diversions upstream from station for domestic supply.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 30,400 ft³/s, Dec. 23, 1955, gage height, 23.10 ft, site and datum then in use, from rating curve extended above 4,500 ft³/s, on basis of slope-area measurement of peak flow; no flow for several days in 1955 and many days in 1960. Maximum gage height, 23.67 ft, Feb. 07, 2017.
