Castor River at Zalma, MO

USGS Site No: 07021000 • Castor River • Bollinger County, MO

Castor River at Zalma, MO on the Castor River is currently at 147 cfs (Normal — 69th percentile for this date) . Gage height: 1.76 ft.

Reading from

147
CFS Discharge
1.76
Gage Height (ft)
Normal
Flow Condition
N/A
Flood Status

Historical Percentile Comparison

Today's discharge compared to the long-term record for October 28 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.

Percentile Label CFS Threshold Today's Flow
10th Very Low threshold 61
25th Low threshold 82
50th (Median) Normal (median) 114
75th High threshold 158 Today: 147 cfs
95th Very High threshold 530

30-Day Hydrograph

Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.

7k 3.5k 0 cfs Apr 3 May 28
10th–95th historical Day-of-year median Recent discharge

30-Day Flow History

Date Discharge (CFS) Gage Ht (ft)
May 28, 2026 152 —
May 27, 2026 141 —
May 26, 2026 133 —
May 25, 2026 136 —
May 24, 2026 139 —
May 23, 2026 135 —
May 22, 2026 130 —
May 21, 2026 129 —
May 20, 2026 132 —
May 17, 2026 145 —
May 16, 2026 149 —
May 15, 2026 156 —
Apr 20, 2026 808 —
Apr 19, 2026 961 —
Apr 18, 2026 535 —
Apr 17, 2026 389 —
Apr 16, 2026 304 —
Apr 15, 2026 285 —
Apr 14, 2026 308 —
Apr 13, 2026 334 —
Apr 12, 2026 365 —
Apr 11, 2026 404 —
Apr 10, 2026 429 —
Apr 9, 2026 479 —
Apr 8, 2026 550 —
Apr 7, 2026 663 —
Apr 6, 2026 897 —
Apr 5, 2026 1,140 —
Apr 4, 2026 276 —
Apr 3, 2026 210 —

Station Information

USGS Site No
07021000
State
MO
County
Bollinger County
Coordinates
37.1466, -90.0755
Drainage Area
423 mi²
Datum (ft)
350.5
HUC Code
07140107
View on USGS NWIS →

Recent Extremes

Max discharge
8,440 cfs
Mar 6, 2026
Min discharge
68 cfs
Sep 19, 2025

Computed from the local daily-values archive.

Nearby Gauges

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