How high is the Iliamna River near Pedro Bay AK right now?

The Iliamna River near Pedro Bay AK is currently flowing at 1,010 cubic feet per second with a gage height of 58.25 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Iliamna River near Pedro Bay AK normal for this time of year?

Current flow is classified as high for October 27. Today's discharge is at the 76th percentile compared to the long-term historical record at this gauge.

Is the Iliamna River near Pedro Bay AK at flood stage?

No — the gage height is 12.75 feet below the NWS flood-stage threshold of 71.0 feet.

What is the historical median flow for the Iliamna River near Pedro Bay AK on October 27?

The long-term median discharge for this date is 617 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 186 to 2,790 cfs.

Where is the Iliamna River near Pedro Bay AK stream gauge located?

The Iliamna River near Pedro Bay AK stream gauge is operated by the USGS in Lake and Peninsula Borough, AK on the Iliamna River. USGS site number 15300300 (coordinates 59.7579, -153.8469).

Iliamna River near Pedro Bay AK

USGS Site No: 15300300 • Iliamna River • Lake and Peninsula Borough, AK

Iliamna River near Pedro Bay AK on the Iliamna River is currently at 1,010 cfs (High — 76th percentile for this date) . Gage height: 58.25 ft.

Reading from 4 months ago

1,010

CFS Discharge

58.25

Gage Height (ft)

High

Flow Condition

Normal

Flood Status

Historical Percentile Comparison

Today's discharge compared to the long-term record for October 27 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	186
25th	Low threshold	317
50th (Median)	Normal (median)	617
75th	High threshold	894
95th	Very High threshold	2,790	Today: 1,010 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	1,110	—
May 27, 2026	1,380	—
May 26, 2026	1,030	—
May 25, 2026	748	—
May 24, 2026	769	—
May 23, 2026	953	—
May 22, 2026	1,010	—
May 21, 2026	974	—
May 20, 2026	1,180	—
May 19, 2026	1,720	—
May 18, 2026	1,100	—
May 17, 2026	998	—
May 16, 2026	786	—
May 15, 2026	901	—
Apr 9, 2026	64	—
Apr 8, 2026	67	—
Apr 7, 2026	67	—
Apr 6, 2026	67	—
Apr 5, 2026	67	—
Apr 4, 2026	70	—
Apr 3, 2026	72	—
Apr 2, 2026	74	—
Apr 1, 2026	73	—
Mar 31, 2026	73	—
Mar 30, 2026	74	—
Mar 29, 2026	76	—
Mar 28, 2026	79	—
Mar 27, 2026	84	—
Mar 26, 2026	89	—
Mar 25, 2026	93	—

Station Information

USGS Site No: 15300300
State: AK
County: Lake and Peninsula Borough
Coordinates: 59.7579, -153.8469
Drainage Area: 129 mi²
Datum (ft): 80.0
HUC Code: 19030206

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 64.0 ft
Flood Stage: 71.0 ft
Moderate Flood: 75.0 ft

Currently 12.75 ft below flood stage.

Recent Extremes

Max discharge: 5,680 cfs

Aug 28, 2025
Min discharge: 64 cfs

Apr 9, 2026
Days at flood stage: 0

Computed from the local daily-values archive.