About this river
San Diego River is a 14.8 mile river near Boundless Boat Charters in California. Streamflow is measured at the USGS gauge San Diego R at Mast RD near Santee CA (site 11022480). The National Hydrography Dataset places it at stream order 7. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1912 to 2026
San Diego River typically runs highest in March, at a median 12 cfs, and lowest in August, at 0.2 cfs. The highest flow on record for any single day is 27,300 cfs, in 1927.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 6.3 | 0.9 to 14 | |
| February | 9.7 | 3.0 to 35 | |
| March | 12 | 4.3 to 36 | |
| April | 6.5 | 2.4 to 20 | |
| May | 2.7 | 0.9 to 8.1 | |
| June | 1.4 | 0.1 to 3.5 | |
| July | 0.3 | 0.0 to 1.8 | |
| August | 0.2 | 0.0 to 1.5 | |
| September | 0.3 | 0.0 to 1.6 | |
| October | 0.6 | 0.0 to 2.4 | |
| November | 1.2 | 0.1 to 4.5 | |
| December | 3.5 | 0.2 to 8.8 |
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 112 years of record. Statistics published by the US Geological Survey for San Diego R at Mast RD near Santee CA (site 11022480). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
3 mapped launches sit in the mapped area of San Diego River, all of them public access. Ramp data comes from the USGS national boat-ramp inventory.
- Murray ReservoirMurray ReservoirPublic
- Mission Bay - De Anza CoveMission BayPublic
- Lake JenningsLake JenningsPublic
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show San Diego River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
See every free widget you can put on your site, including live conditions and a 7 day forecast.
