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USGSSite ID: 01029500active

USGS 01029500

East Branch Penobscot River at Grindstone, Maine

East Branch Penobscot River • Penobscot County • ME

Latest public reading4,720 cfsObserved May 11, 2026 at 2:00 PM CDT
TrendRisingForecast available
Data freshness StaleObservation 3090 minutes old
Flood contextNo source flood categoryFetched Timestamp unavailable

Stage and discharge

Observed source readings

Stage and discharge

Hourly readings and linked forecast values

Observed Forecast

Stage and discharge chart includes 2 observed points and 3 forecast points.

Line chart: Observed, Forecast01234567806-16 21:0006-22 00:0006-22 12:00
Data series

Flood-stage context

Source-published thresholds where available

Action11.5 ftSource-backed threshold
Minor flood14 ftSource-backed threshold
Moderate flood16 ftSource-backed threshold
Major flood17 ftSource-backed threshold

Forecast

Linked NWS/NWPS values

HGIFF • stage6.7 ftValid Jun 21, 2026 at 7:00 PM CDT
HGIFF • stage6.6 ftValid Jun 22, 2026 at 1:00 AM CDT
HGIFF • stage6.6 ftValid Jun 22, 2026 at 7:00 AM CDT

Observations

Stage

7.02 ft

Observed Jun 19, 2026 at 11:00 AM CDT

Stage

6.05 ft

Observed Jun 16, 2026 at 4:00 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.