South Fork Jocko River Near Arlee Mount

USGS Site No: 12381400 • South Fork Jocko River • Lake County, MT

South Fork Jocko River Near Arlee Mount on the South Fork Jocko River is currently at 301 cfs (High — 76th percentile for this date) . Gage height: 2.84 ft.

Reading from

301
CFS Discharge
2.84
Gage Height (ft)
High
Flow Condition
N/A
Flood Status

Historical Percentile Comparison

Today's discharge compared to the long-term record for June 11 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 106
25th Low threshold 145
50th (Median) Normal (median) 222
75th High threshold 287
95th Very High threshold 548 Today: 301 cfs

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.

761 381 0 cfs Apr 5 May 28
10th–95th historical Day-of-year median Recent discharge

30-Day Flow History

Date Discharge (CFS) Gage Ht (ft)
May 28, 2026 324 —
May 27, 2026 256 —
May 26, 2026 234 —
May 25, 2026 213 —
May 24, 2026 196 —
May 23, 2026 189 —
May 22, 2026 191 —
May 21, 2026 203 —
May 20, 2026 206 —
May 19, 2026 209 —
May 18, 2026 224 —
May 17, 2026 242 —
May 16, 2026 264 —
May 15, 2026 291 —
Apr 20, 2026 156 —
Apr 19, 2026 153 —
Apr 18, 2026 157 —
Apr 17, 2026 166 —
Apr 16, 2026 180 —
Apr 15, 2026 190 —
Apr 14, 2026 196 —
Apr 13, 2026 201 —
Apr 12, 2026 195 —
Apr 11, 2026 177 —
Apr 10, 2026 163 —
Apr 9, 2026 159 —
Apr 8, 2026 157 —
Apr 7, 2026 145 —
Apr 6, 2026 124 —
Apr 5, 2026 115 —

Station Information

USGS Site No
12381400
State
MT
County
Lake County
Coordinates
47.1956, -113.8507
Drainage Area
58 mi²
Datum (ft)
3,970.0
HUC Code
17010212
View on USGS NWIS →

Recent Extremes

Max discharge
324 cfs
May 28, 2026
Min discharge
10 cfs
Nov 29, 2025

Computed from the local daily-values archive.

Nearby Gauges

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