Around here
Around South Fork Trinity River
Data Source: Recreation.gov · Source: USGS GNIS · Public land: USGS PAD-US
About this river
South Fork Trinity River is a 41.8 mile river. Streamflow is measured at the USGS gauge SF Trinity R below Hyampom CA (site 11528700). The National Hydrography Dataset places it at stream order 8. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1966 to 2026
South Fork Trinity River typically runs highest in March, at a median 2,300 cfs, and lowest in September, at 68 cfs. The highest flow on record for any single day is 59,200 cfs, in 1974.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 1,610 | 630 to 3,560 |
| February | 2,050 | 1,110 to 3,760 |
| March | 2,300 | 1,220 to 4,080 |
| April | 1,585 | 829 to 2,635 |
| May | 799 | 480 to 1,380 |
| June | 326 | 236 to 560 |
| July | 137 | 94 to 231 |
| August | 74 | 48 to 109 |
| September | 68 | 38 to 87 |
| October | 80 | 58 to 114 |
| November | 183 | 113 to 423 |
| December | 704 | 278 to 2,270 |
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 61 years of record. Statistics published by the US Geological Survey for SF Trinity R below Hyampom CA (site 11528700). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Made to print
Put South Fork Trinity River on your wall
This river section as an art print, drawn over the real terrain with its miles, plus the trails, roads and peaks around it. Pick the colors and the size, and see the finished print before you buy. From $39, shipping included.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show South Fork Trinity 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.
