Castor River Flow Today
As of November 11, 2026 at 1:45 AM, the Castor River is flowing at 98 cfs at Zalma, MO — 52% of normal for the date and up 1% in 24 hours. ❤ Favorite
Castor River map
See the Castor River on a live map
Every gauge, dam and paddle run on the river, one tap each:
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Castor River conditions today
Where the river is running versus normal, what’s rising or dropping, and what it means for a trip — built from the live USGS readings below.
At Zalma, the Castor River is running 98 cfs — 52% of normal, up 1% since yesterday. Along the river, 1 of 1 reporting gauges are below normal (the typical gauge is at 52% of normal).
How the Castor River compares to normal
Every reporting gauge from the top of the river to the bottom: bar length is today’s flow, colour is percent of normal for the date.
Flow along the river, upstream to downstream
- Zalma365 ft 98 cfs52%
Bar length uses a square-root scale so small headwater flows stay visible next to big downstream ones. Colour: <50% 50–90 90–110 110–150 150%+ of normal.
Where every gauge sits
One dot per Castor River streamgauge, placed by its own percent of normal. The line is the typical gauge (52%).
Castor River flow report
| Streamgage | Streamflow | % of normal | 24h | Gage height | Elevation |
|---|---|---|---|---|---|
|
Castor River At Zalma MO
Nov 11, 1:45 AM · USGS 07021000 |
98 cfs | 52% | +1% | 1.22 ft | 365 ft |
USGS provisional data. Readings are in each gauge’s local time; gauges silent for more than 3 days are marked “Last reported”. Tap any gauge for its hydrograph, forecast and history.
Dams & reservoirs on the Castor River
Releases from these dams shape the flow downstream. Tap one for its daily level and history.
Castor River streamflow over time
Daily total flow across every monitored gauge on the river (this total last updated earlier; the live gauge readings above are current).
Castor River
The Castor River is a 51-mile-long river located in southeastern Missouri. It flows through rural farmland and wooded areas before emptying into the St. Francis River. Historically, the river was used for transportation and as a source of power for mills. The river's hydrology is heavily influenced by precipitation, with high water levels occurring in the spring and low levels in the summer. The river is home to a few small reservoirs and dams, including the Sam A. Baker Dam and the Mudlick Hollow Dam. These dams are used for flood control and recreation purposes, including fishing and boating. The river is also used for agricultural purposes, with fields and pastures located along its banks. The Castor River is a popular destination for outdoor enthusiasts looking to enjoy the river's natural beauty and recreational opportunities.
Fishing near the Castor River
About the Castor River
How is the Castor River flowing right now?
As of November 11, 2026, the Castor River is flowing at 98 cfs at Zalma, MO, about 52% of normal for the date. Every gauge’s live reading is in the table above.
Is the Castor River running high or low?
The typical gauge on the Castor River is at 52% of normal for the date. Above 100% means higher than the historical average for this calendar day; below 100% means lower. The profile above shows which reaches are high or low.
Where does the data come from?
Discharge and gage height are from the USGS National Water Information System; flood stages from the National Weather Service. The history chart sums every monitored gauge on the river.
Can I get alerts for a gauge?
Yes — open any gauge from the table, favorite it in the Snoflo app and set a flow threshold.