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NWS / NWPSSite ID: mmoi2active

NWS / NWPS mmoi2

Illinois River at Marseilles Lock (tailwater)

Illinois River • La Salle • IL

Latest public reading459.59 ftObserved Aug 30, 2026 at 6:30 AM CDT
TrendFallingForecast available
Data freshnessStaleBeyond three times the publishing interval. Value shown with its age, never hidden.Observation 5676 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 9 forecast points.

Line chart: Observed, Forecast01002003004005002026-05-112026-06-272026-09-032026-09-052026-09-05
Data series

Flood-stage context

Source-published thresholds where available

Action466.5 ftSource-backed threshold
Minor flood467 ftSource-backed threshold

Forecast

Linked NWS/NWPS values

HTIFF • stage459.3 ftValid Sep 3, 2026 at 7:00 AM CDT
HTIFF • stage459.3 ftValid Sep 3, 2026 at 1:00 PM CDT
HTIFF • stage459.3 ftValid Sep 3, 2026 at 7:00 PM CDT
HTIFF • stage459.3 ftValid Sep 4, 2026 at 1:00 AM CDT
HTIFF • stage459.3 ftValid Sep 4, 2026 at 7:00 AM CDT
HTIFF • stage459.3 ftValid Sep 4, 2026 at 1:00 PM CDT

Observations

stage

459.59 ft

Observed Aug 29, 2026 at 7:00 PM CDT

stage

460.24 ft

Observed Aug 23, 2026 at 7:00 PM CDT

stage

459.61 ft

Observed Aug 9, 2026 at 7:00 PM CDT

stage

459.62 ft

Observed Jul 26, 2026 at 7:00 PM CDT

stage

462.83 ft

Observed Jul 4, 2026 at 7:00 PM CDT

stage

461.41 ft

Observed Jun 26, 2026 at 7:00 PM CDT

stage

461.78 ft

Observed Jun 20, 2026 at 7:00 PM CDT

stage

464.85 ft

Observed Jun 13, 2026 at 7:00 PM CDT

stage

459.06 ft

Observed Jun 3, 2026 at 7:00 PM CDT

stage

459.3 ft

Observed May 28, 2026 at 7:00 PM CDT

stage

459.62 ft

Observed May 19, 2026 at 7:00 PM CDT

stage

459.65 ft

Observed May 10, 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.