Around here
Around Napa River
- John Muir National Historic Site Visitor CenterVisitor center10.6 mi (opens in a new tab)
- San Pablo Bay National Wildlife RefugeRecreation area11 mi (opens in a new tab)
- John Muir National Historic SiteRecreation area11 mi (opens in a new tab)
- Marin Islands National Wildlife RefugeRecreation area14.2 mi (opens in a new tab)
Data Source: Recreation.gov · Source: USGS GNIS · Public land: USGS PAD-US
About this river
Napa River is a 53.9 mile river near Sea Trek Kayak and SUP (Sausalito) in California. Streamflow is measured at the USGS gauge Napa R near ST Helena CA (site 11456000). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1930 to 2026
Napa River typically runs highest in February, at a median 85 cfs, and lowest in September, at 0.4 cfs. The highest flow on record for any single day is 13,700 cfs, in 1986.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 68 | 16 to 241 |
| February | 85 | 36 to 252 |
| March | 81 | 35 to 186 |
| April | 34 | 23 to 72 |
| May | 14 | 9.1 to 23 |
| June | 5.0 | 2.8 to 9.7 |
| July | 1.5 | 0.5 to 3.0 |
| August | 0.7 | 0.1 to 1.4 |
| September | 0.4 | 0.0 to 0.9 |
| October | 0.6 | 0.1 to 1.3 |
| November | 2.9 | 0.9 to 8.5 |
| December | 14 | 4.7 to 87 |
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 85 years of record. Statistics published by the US Geological Survey for Napa R near ST Helena CA (site 11456000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
8 mapped launches sit in the mapped area of Napa River. Ramp data comes from the USGS national boat-ramp inventory.
- Napa Valley MarinaNapa RiverPublic
- Vallejo LaunchMare Island StraitPublic
- Petaluma River Public Fishing Access (Black Point)Petaluma RiverPublic
- Gilardi's Lakeview MarinaPetaluma RiverRestricted
- Napa Sea RanchNapa RiverPublic
- Kennedy ParkNapa RiverPublic
- Cuttings WharfNapa RiverPublic
- Lake Hennessey Recreation AreaLake HennesseyPublic
Made to print
Put Napa 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 Napa 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.
