About this river
San Gregorio Creek is a 3.7 mile river near Half Moon Bay Kayak Co. in California. Streamflow is measured at the USGS gauge San Gregorio C at San Gregorio CA (site 11162570). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1970 to 2026
San Gregorio Creek typically runs highest in March, at a median 32 cfs, and lowest in September, at 0.7 cfs. The highest flow on record for any single day is 4,120 cfs, in 1982.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 20 | 6.9 to 72 | |
| February | 28 | 9.6 to 85 | |
| March | 32 | 12 to 86 | |
| April | 18 | 8.3 to 45 | |
| May | 8.5 | 3.4 to 16 | |
| June | 4.5 | 1.5 to 9.0 | |
| July | 2.1 | 0.5 to 4.2 | |
| August | 1.1 | 0.1 to 2.7 | |
| September | 0.7 | 0.1 to 2.3 | |
| October | 1.2 | 0.3 to 2.6 | |
| November | 3.0 | 1.4 to 5.7 | |
| December | 6.7 | 3.4 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 Gregorio C at San Gregorio CA (site 11162570). 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 Gregorio 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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