How high is the South Branch Ralston Creek at Iowa City, IA right now?

The South Branch Ralston Creek at Iowa City, IA is currently flowing at 0 cubic feet per second with a gage height of 1.67 feet, based on the most recent USGS instantaneous reading.

Is the flow on the South Branch Ralston Creek at Iowa City, IA normal for this time of year?

Current flow is classified as very low for June 11. Today's discharge is at the 3th percentile compared to the long-term historical record at this gauge.

Is the South Branch Ralston Creek at Iowa City, IA at flood stage?

No — the gage height is 5.33 feet below the NWS flood-stage threshold of 7.0 feet.

What is the historical median flow for the South Branch Ralston Creek at Iowa City, IA on June 11?

The long-term median discharge for this date is 1 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 0 to 7 cfs.

Where is the South Branch Ralston Creek at Iowa City, IA stream gauge located?

The South Branch Ralston Creek at Iowa City, IA stream gauge is operated by the USGS in Johnson County, IA on the South Branch Ralston Creek. USGS site number 05455010 (coordinates 41.6514, -91.5077).

South Branch Ralston Creek at Iowa City, IA

USGS Site No: 05455010 • South Branch Ralston Creek • Johnson County, IA

South Branch Ralston Creek at Iowa City, IA on the South Branch Ralston Creek is currently at 0 cfs (Very Low — 3th percentile for this date) . Gage height: 1.67 ft.

Reading from 1 week ago

CFS Discharge

1.67

Gage Height (ft)

Very Low

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	0	Today: 0 cfs
25th	Low threshold	0
50th (Median)	Normal (median)	1
75th	High threshold	3
95th	Very High threshold	7

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	—	1.63
May 27, 2026	—	1.67
May 26, 2026	—	1.69
May 25, 2026	—	1.69
May 24, 2026	—	1.72
May 23, 2026	—	1.73
May 22, 2026	—	1.73
May 21, 2026	—	1.73
May 20, 2026	—	1.76
May 19, 2026	—	1.96
May 18, 2026	—	1.95
May 17, 2026	—	1.86
May 16, 2026	—	1.76
May 15, 2026	—	1.63
Apr 20, 2026	—	1.88
Apr 19, 2026	—	1.92
Apr 18, 2026	—	1.97
Apr 17, 2026	—	2.06
Apr 16, 2026	—	2.12
Apr 15, 2026	—	2.50
Apr 14, 2026	—	1.94
Apr 13, 2026	—	1.99
Apr 12, 2026	—	2.05
Apr 11, 2026	—	2.02
Apr 10, 2026	—	2.29
Apr 9, 2026	—	2.16
Apr 8, 2026	—	1.86
Apr 7, 2026	—	1.88
Apr 6, 2026	—	1.93
Apr 5, 2026	—	1.98

Station Information

USGS Site No: 05455010
State: IA
County: Johnson County
Coordinates: 41.6514, -91.5077
Drainage Area: 3 mi²
Datum (ft): 677.9
HUC Code: 07080209

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 6.0 ft
Flood Stage: 7.0 ft

Currently 5.33 ft below flood stage.

Nearby Gauges

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1.8 mi · 2,420 cfs

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3.5 mi · 7 cfs

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Muddy Creek at Coralville, IA
4.4 mi · 4 cfs

Low
Iowa River Below Coralville Dam near Coralville, IA
4.6 mi · 2,390 cfs

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Clear Creek Near Coralville, IA
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