Aegis Geospatial About this system

Mississippi River Corridor Intelligence

A real-time upstream-to-downstream system view from St. Anthony Falls through Lake Pepin to Winona.
Elevations normalized to NAVD88 where defensible.

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Closest threshold
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Strongest movement
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Highest relative stage
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Forecast
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Seasonal
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System map
Upstream -> Downstream
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About this system

How to use this

  • Start with the briefing
    Get a quick read on what the corridor is doing right now.
  • Scan the cards
    Compare stage, movement, thresholds, and forecast across sites.
  • Read thresholds carefully
    Action and flood rows show distance to local warning levels.
  • Use control sites for mechanics
    Pools, tailwater, and drop explain how structures shape the river.
  • Open a station to inspect
    Use Explore to view the full hydrograph and deeper context.

What this is

A real-time, upstream-to-downstream system view of the Mississippi corridor.
Published by Aegis Geospatial to make river behavior legible at a glance.

What this is not

This is not a flood forecast model or official warning system.
Refer to NOAA / NWS for alerts and official guidance.

Glossary

NAVD88Shared elevation reference used for cross-site comparison.
DischargeRiver flow in cubic feet per second (cfs).
1h trendEstimated rise, fall, or steadiness over the last hour.
ObservedTime of the latest reading used on the card.
Flood proximityDistance below flood stage at a threshold site.
Flood watchpointSite with defined action and flood thresholds.
Control bandOperating range for a dam or control surface.
Reference positionWhere a site sits within its local comparison band.
PoolWater surface held upstream of a dam or control.
TailwaterWater level immediately downstream of a lock or dam.
Pool dropDifference between upstream pool and downstream tailwater.
Condition badgeQuick state call for the site or corridor.
Provenance chipHow the primary level was observed, converted, or bridged.

Sources

USGS
Anoka, Brooklyn Park, South St. Paul, Prescott, Winona

USACE
St. Anthony Falls, Ford Dam, Hastings, Red Wing, Alma

Transformations

St. Anthony uses official MSL 1912 -> NAVD88 conversion.

Lock & Dam 3 is bridged through Prescott for corridor continuity.

Some sites remain in local datum where a direct NAVD88 tie is not available.

Notes

Hastings uses dual-read control (USACE pool/tailwater + NOAA HSTM5 stage).

Hydraulic interpretation is informed by river-hydraulics concepts and, near St. Anthony Falls, SAFL research context.

Datum

The corridor uses NAVD88 where defensible.

See the NGS FAQ and release timeline for reference.

Why this system matters

River systems are connected across space and time. Seeing upstream movement, downstream response, station context, and recent historical patterns together makes conditions easier to interpret and decisions more grounded. Mississippi River Corridor Intelligence is published by Aegis Geospatial.

Report an issue

Feedback and issue reporting for this system will be handled through a protected form.

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