About this river
San Lorenzo Creek is a 4.8 mile stream near Modern Sailing School & Club in California. Streamflow is measured at the USGS gauge San Lorenzo C at San Lorenzo CA (site 11181040). The mapped line runs from 37.6780, -122.0805 to 37.6761, -122.1527. The National Hydrography Dataset places it at stream order 4. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1968 to 2026
San Lorenzo Creek typically runs highest in March, at a median 23 cfs, and lowest in September, at 1.2 cfs. The highest flow on record for any single day is 3,730 cfs, in 2023.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 14 | 3.4 to 47 | |
| February | 23 | 7.2 to 51 | |
| March | 23 | 7.4 to 53 | |
| April | 15 | 5.2 to 33 | |
| May | 5.4 | 2.9 to 12 | |
| June | 2.7 | 1.4 to 5.8 | |
| July | 1.7 | 1.1 to 2.7 | |
| August | 1.4 | 0.8 to 2.0 | |
| September | 1.2 | 0.8 to 1.8 | |
| October | 1.4 | 1.0 to 2.5 | |
| November | 2.5 | 1.3 to 5.5 | |
| December | 6.1 | 2.4 to 22 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 48 years of record. Statistics published by the US Geological Survey for San Lorenzo C at San Lorenzo CA (site 11181040). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show San Lorenzo Creek's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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