OnBoat Inc. | Los Angeles Yacht Rental
Arroyo Seco near OnBoat Inc. | Los Angeles Yacht Rental
About this river
Arroyo Seco is a 6.0 mile stream near OnBoat Inc. | Los Angeles Yacht Rental in California. Streamflow is measured at the USGS gauge Arroyo Seco near Pasadena CA (site 11098000). The National Hydrography Dataset places it at stream order 4. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1911 to 2026
Arroyo Seco typically runs highest in March, at a median 7.1 cfs, and lowest in September, at 0.3 cfs. The highest flow on record for any single day is 3,690 cfs, in 1914.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 3.1 | 1.4 to 8.0 | |
| February | 6.1 | 2.3 to 18 | |
| March | 7.1 | 2.9 to 22 | |
| April | 5.6 | 2.2 to 17 | |
| May | 3.2 | 1.6 to 6.6 | |
| June | 1.6 | 0.9 to 4.0 | |
| July | 0.7 | 0.3 to 2.0 | |
| August | 0.4 | 0.1 to 1.1 | |
| September | 0.3 | 0.1 to 0.8 | |
| October | 0.5 | 0.2 to 1.1 | |
| November | 1.0 | 0.3 to 2.2 | |
| December | 1.9 | 0.9 to 4.0 |
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 115 years of record. Statistics published by the US Geological Survey for Arroyo Seco near Pasadena CA (site 11098000). 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 Seco'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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