How high is the L Arkansas River at Alta Mills, KS right now?

The L Arkansas River at Alta Mills, KS is currently flowing at 330 cubic feet per second with a gage height of 3.79 feet, based on the most recent USGS instantaneous reading.

Is the flow on the L Arkansas River at Alta Mills, KS normal for this time of year?

Current flow is classified as high for June 11. Today's discharge is at the 76th percentile compared to the long-term historical record at this gauge.

Is the L Arkansas River at Alta Mills, KS at flood stage?

No — the gage height is 18.21 feet below the NWS flood-stage threshold of 22.0 feet.

What is the historical median flow for the L Arkansas River at Alta Mills, KS on June 11?

The long-term median discharge for this date is 44 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 7 to 2,670 cfs.

Where is the L Arkansas River at Alta Mills, KS stream gauge located?

The L Arkansas River at Alta Mills, KS stream gauge is operated by the USGS in Harvey County, KS on the Arkansas River. USGS site number 07143665 (coordinates 38.1122, -97.5920).

L Arkansas River at Alta Mills, KS

USGS Site No: 07143665 • Arkansas River • Harvey County, KS

L Arkansas River at Alta Mills, KS on the Arkansas River is currently at 330 cfs (High — 76th percentile for this date) . Gage height: 3.79 ft.

Reading from 1 week ago

↑ Upstream on Arkansas River

Arkansas River Below Granite, CO

Downstream on Arkansas River ↓

L Arkansas River at Highway 50 near Halstead, KS

330

CFS Discharge

3.79

Gage Height (ft)

High

Flow Condition

Normal

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	7
25th	Low threshold	20
50th (Median)	Normal (median)	44
75th	High threshold	147
95th	Very High threshold	2,670	Today: 330 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.

10th–95th historical Day-of-year median Recent discharge

30-Day Flow History

Date	Discharge (CFS)	Gage Ht (ft)
May 28, 2026	18	-0.12
May 27, 2026	3	-0.63
May 26, 2026	3	-0.61
May 25, 2026	3	-0.59
May 24, 2026	4	-0.59
May 23, 2026	4	-0.57
May 22, 2026	4	-0.59
May 21, 2026	4	-0.56
May 20, 2026	5	-0.51
May 19, 2026	5	-0.51
May 18, 2026	4	-0.59
May 17, 2026	3	-0.63
May 16, 2026	3	-0.62
May 15, 2026	3	-0.60
Apr 20, 2026	6	-0.45
Apr 19, 2026	6	-0.44
Apr 18, 2026	7	-0.41
Apr 17, 2026	8	-0.38
Apr 16, 2026	8	-0.35
Apr 15, 2026	9	-0.32
Apr 14, 2026	11	-0.25
Apr 13, 2026	13	-0.18
Apr 12, 2026	16	-0.09
Apr 11, 2026	15	-0.10
Apr 10, 2026	10	-0.28
Apr 9, 2026	9	-0.35
Apr 8, 2026	9	-0.34
Apr 7, 2026	9	-0.32
Apr 6, 2026	9	-0.34
Apr 5, 2026	8	-0.35

Station Information

USGS Site No: 07143665
State: KS
County: Harvey County
Coordinates: 38.1122, -97.5920
Drainage Area: 736 mi²
Datum (ft): 1,392.0
HUC Code: 11030012

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 20.0 ft
Flood Stage: 22.0 ft
Moderate Flood: 25.0 ft
Major Flood: 27.0 ft

Currently 18.21 ft below flood stage.

Recent Extremes

Max discharge: 6,200 cfs

Jun 19, 2025
Min discharge: 0 cfs

Apr 23, 2025
Days at flood stage: 2

Computed from the local daily-values archive.

Nearby Gauges

L Arkansas River at Highway 50 near Halstead, KS
6.4 mi · 307 cfs

High
Emma C at Sedgwick, KS
11.8 mi · 837 cfs

Very High
Arkansas River near Hutchinson, KS
15.2 mi · 228 cfs

Low
L Arkansas River near Sedgwick, KS
18.3 mi · 2,440 cfs

High
L Arkansas River at Valley Center, KS
22.3 mi · 1,680 cfs

High