About this river
Arroyo Trabuco is a 7.8 mile river near Laguna Ethos in California. Streamflow is measured at the USGS gauge Arroyo Trabuco at San Juan Capistrano CA (site 11047300). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1973 to 2026
Arroyo Trabuco typically runs highest in March, at a median 8.3 cfs, and lowest in August, at 0.8 cfs. The highest flow on record for any single day is 3,490 cfs, in 2011.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 5.2 | 3.3 to 13 | |
| February | 7.2 | 3.5 to 25 | |
| March | 8.3 | 3.9 to 24 | |
| April | 4.8 | 2.4 to 12 | |
| May | 3.1 | 1.5 to 6.3 | |
| June | 1.6 | 0.8 to 3.0 | |
| July | 1.3 | 0.6 to 2.2 | |
| August | 0.8 | 0.4 to 1.7 | |
| September | 1.1 | 0.5 to 2.3 | |
| October | 1.5 | 0.6 to 3.2 | |
| November | 2.5 | 1.0 to 4.8 | |
| December | 4.6 | 2.3 to 10 |
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 42 years of record. Statistics published by the US Geological Survey for Arroyo Trabuco at San Juan Capistrano CA (site 11047300). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Arroyo Trabuco'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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