About this river
San Mateo Creek is a 4.6 mile stream near Half Moon Bay Kayak Co. in California. Streamflow is measured at the USGS gauge San Mateo C below LO Crystal SP Res near San Mateo CA (site 11162753). The National Hydrography Dataset places it at stream order 4. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
2008 to 2026
San Mateo Creek typically runs highest in February, at a median 17 cfs, and lowest in July, at 3.3 cfs. The highest flow on record for any single day is 298 cfs, in 2017.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 17 | 1.2 to 20 | |
| February | 17 | 2.4 to 21 | |
| March | 16 | 4.0 to 18 | |
| April | 5.7 | 2.6 to 6.5 | |
| May | 3.4 | 1.3 to 4.0 | |
| June | 3.4 | 1.1 to 3.7 | |
| July | 3.3 | 1.1 to 4.0 | |
| August | 3.3 | 1.0 to 3.7 | |
| September | 3.3 | 0.8 to 3.5 | |
| October | 3.3 | 1.0 to 3.6 | |
| November | 3.3 | 1.1 to 3.8 | |
| December | 5.5 | 1.4 to 6.6 |
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 18 years of record. Statistics published by the US Geological Survey for San Mateo C below LO Crystal SP Res near San Mateo CA (site 11162753). 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 Mateo 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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