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NWS / NWPSSite ID: GRSA2active

NWS / NWPS GRSA2

Gulkana River at Sourdough

Gulkana River • Copper River • AK

Latest public reading6.14 ftObserved Sep 3, 2026 at 12:15 AM CDT
TrendFallingForecast available
Data freshnessStaleBeyond three times the publishing interval. Value shown with its age, never hidden.Observation 518 minutes old
Flood contextNo source flood categoryFetched Timestamp unavailable

Stage and discharge

Observed source readings

Stage and discharge

Daily rollups and linked forecast values

Observed Forecast

Stage and discharge chart includes 12 observed points and 7 forecast points.

Line chart: Observed, Forecast02468102026-05-132026-08-312026-09-05
Data series

Flood-stage context

Source-published thresholds where available

Action9.5 ftSource-backed threshold
Minor flood11 ftSource-backed threshold

Forecast

Linked NWS/NWPS values

HGIFE • stage6.14 ftValid Sep 3, 2026 at 1:00 PM CDT
HGIFE • stage6.13 ftValid Sep 3, 2026 at 7:00 PM CDT
HGIFE • stage6.13 ftValid Sep 4, 2026 at 1:00 AM CDT
HGIFE • stage6.12 ftValid Sep 4, 2026 at 7:00 AM CDT
HGIFE • stage6.11 ftValid Sep 4, 2026 at 1:00 PM CDT
HGIFE • stage6.11 ftValid Sep 4, 2026 at 7:00 PM CDT

Observations

stage

6.14 ft

Observed Sep 2, 2026 at 7:00 PM CDT

stage

6.12 ft

Observed Aug 30, 2026 at 7:00 PM CDT

stage

6.06 ft

Observed Aug 21, 2026 at 7:00 PM CDT

stage

6.93 ft

Observed Jul 24, 2026 at 7:00 PM CDT

stage

6.69 ft

Observed Jul 22, 2026 at 7:00 PM CDT

stage

6.92 ft

Observed Jul 19, 2026 at 7:00 PM CDT

stage

7.81 ft

Observed Jun 23, 2026 at 7:00 PM CDT

stage

7.02 ft

Observed Jun 20, 2026 at 7:00 PM CDT

stage

8.54 ft

Observed Jun 4, 2026 at 7:00 PM CDT

stage

8.95 ft

Observed Jun 1, 2026 at 7:00 PM CDT

stage

8.88 ft

Observed May 13, 2026 at 7:00 PM CDT

stage

8.94 ft

Observed May 12, 2026 at 7:00 PM CDT

Alerts

Alerts unavailable

Alerts are shown only when the API returns a source-backed match.

Official public sources

Readings and thresholds stay tied to USGS, NOAA/NWS, or source-backed records.

Source freshness

Observed and fetched timestamps are shown separately when the API returns them.

Transparent methodology

Unavailable forecasts, alerts, and thresholds are shown as unavailable states.