Around here
Around Upper Castor River
Data Source: Recreation.gov · Public land: USGS PAD-US
About this river
Upper Castor River is a 43.5 mile river. Streamflow is measured at the USGS gauge Castor River at Zalma, MO (site 07021000). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1920 to 2026
Upper Castor River typically runs highest in April, at a median 537 cfs, and lowest in September, at 78 cfs. The highest flow on record for any single day is 78,000 cfs, in 2008.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 316 | 172 to 667 |
| February | 383 | 246 to 695 |
| March | 520 | 326 to 983 |
| April | 537 | 308 to 1,008 |
| May | 401 | 189 to 947 |
| June | 170 | 98 to 345 |
| July | 97 | 69 to 153 |
| August | 83 | 59 to 131 |
| September | 78 | 57 to 120 |
| October | 96 | 64 to 138 |
| November | 148 | 98 to 287 |
| December | 260 | 149 to 525 |
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 98 years of record. Statistics published by the US Geological Survey for Castor River at Zalma, MO (site 07021000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
4 mapped launches sit in the mapped area of Upper Castor River, all of them public access. Ramp data comes from the USGS national boat-ramp inventory.
- Duck Creek Conservation AreaDuck Creek Conservation Area ditchPublic
- Duck Creek Conservation Area (Greenbrier Unit)Castor RiverPublic
- Maple Flats AccessCastor RiverPublic
- Sweetgum AccessCastor RiverPublic
Made to print
Put Upper Castor 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 Upper Castor 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.
