Ahtanum Creek at Union Gap, WA

USGS Site No: 12502500 • Ahtanum Creek • Yakima County, WA

Ahtanum Creek at Union Gap, WA on the Ahtanum Creek is currently at 76 cfs (Normal — 34th percentile for this date) . Gage height: 3.71 ft.

Reading from

76
CFS Discharge
3.71
Gage Height (ft)
Normal
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 26
25th Low threshold 57
50th (Median) Normal (median) 111 Today: 76 cfs
75th High threshold 212
95th Very High threshold 376

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.

553 276 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 64 3.60
May 27, 2026 68 3.63
May 26, 2026 71 3.67
May 25, 2026 71 3.67
May 24, 2026 74 3.69
May 23, 2026 74 3.70
May 22, 2026 76 3.71
May 21, 2026 78 3.73
May 20, 2026 81 3.76
May 19, 2026 79 3.74
May 18, 2026 67 3.63
May 17, 2026 73 3.69
May 16, 2026 77 3.73
May 15, 2026 83 3.78
Apr 20, 2026 41 3.35
Apr 19, 2026 42 3.37
Apr 18, 2026 44 3.39
Apr 17, 2026 51 3.47
Apr 16, 2026 58 3.54
Apr 15, 2026 73 3.68
Apr 14, 2026 94 3.87
Apr 13, 2026 103 3.95
Apr 12, 2026 103 3.95
Apr 11, 2026 101 3.94
Apr 10, 2026 100 3.92
Apr 9, 2026 99 3.91
Apr 8, 2026 98 3.91
Apr 7, 2026 104 3.96
Apr 6, 2026 104 3.96
Apr 5, 2026 103 3.95

Station Information

USGS Site No
12502500
State
WA
County
Yakima County
Coordinates
46.5360, -120.4734
Drainage Area
173 mi²
Datum (ft)
940.0
HUC Code
17030003
View on USGS NWIS →

Recent Extremes

Max discharge
545 cfs
Dec 11, 2025
Min discharge
7 cfs
Sep 4, 2025

Computed from the local daily-values archive.

Nearby Gauges

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