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NWS / NWPSSite ID: cgmw1active

NWS / NWPS cgmw1

Chehalis River near Grand Mound

Chehalis River • Thurston • WA

Latest public reading253 cfsObserved Sep 9, 2026 at 12:00 PM CDT
TrendNo clear trendForecast available
Data freshnessAgingPast the publishing interval but inside three times it. Still shown, flagged.Observation 76 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 1 observed point and 37 forecast points.

Line chart: Observed, Forecast0501001502002503002026-09-092026-09-152026-09-19
Data series

Flood-stage context

Source-published thresholds where available

Action138.5 ftSource-backed threshold
Minor flood141 ftSource-backed threshold
Moderate flood142.5 ftSource-backed threshold
Major flood144 ftSource-backed threshold

Forecast

Linked NWS/NWPS values

HGIFZ • stage128.91 ftValid Sep 10, 2026 at 1:00 PM CDT
HGIFZ • stage128.93 ftValid Sep 10, 2026 at 7:00 PM CDT
HGIFZ • stage128.94 ftValid Sep 11, 2026 at 1:00 AM CDT
HGIFZ • stage128.95 ftValid Sep 11, 2026 at 7:00 AM CDT
HGIFZ • stage128.95 ftValid Sep 11, 2026 at 1:00 PM CDT
HGIFZ • stage128.95 ftValid Sep 11, 2026 at 7:00 PM CDT

Observations

flow

253 cfs

Observed Sep 8, 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.