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NWS / NWPSSite ID: MMOI2active

NWS / NWPS MMOI2

Illinois River at Marseilles Lock (tailwater)

Illinois River • La Salle • IL

Latest public reading461.78 ftObserved Jun 21, 2026 at 8:30 AM CDT
TrendNo clear trendForecast available
Data freshness StaleObservation 127 minutes old
Flood contextNo source flood categoryFetched Timestamp unavailable

Stage and discharge

Observed source readings

7D30D1Y5Y

Stage and discharge

Hourly readings and linked forecast values

Observed Forecast

Stage and discharge chart includes 1 observed point and 25 forecast points.

Line chart: Observed, Forecast010020030040050006-21 13:3006-26 12:0006-27 12:00
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

status • stage461.9 ftValid Jun 21, 2026 at 1:00 PM CDT
HTIFF • stage461.9 ftValid Jun 21, 2026 at 1:00 PM CDT
HTIFF • stage461.8 ftValid Jun 21, 2026 at 7:00 PM CDT
HTIFF • stage461.7 ftValid Jun 22, 2026 at 1:00 AM CDT
HTIFF • stage461.5 ftValid Jun 22, 2026 at 7:00 AM CDT
HTIFF • stage461.4 ftValid Jun 22, 2026 at 1:00 PM CDT

Observations

Stage

461.78 ft

Observed Jun 21, 2026 at 8:30 AM 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.

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A clear view of U.S. river conditions, gauges, and forecasts.

RiverStat.us aggregates public water data from official and public sources. Data may be delayed, provisional, missing, incorrect, or later corrected by the source.

Data from USGS Water Data and NOAA/NWS.