Live USGS streamgage reading for the Grand River at Ionia (Ionia County, Michigan). Current stage is 11.70 ft — action stage.
The National Weather Service coordinates with USGS to maintain official flood-stage thresholds for this gauge. When the gauge reading crosses a threshold, NWS may issue a Flood Watch or Warning for Ionia County and surrounding areas.
| Stage | Threshold (ft) | What it means |
|---|---|---|
| Action stage | 11.0 | Mitigation actions begin (sandbagging, road closures monitoring). |
| Minor flood stage | 13.0 | Some inundation of low-lying areas; minimal property damage. |
| Moderate flood stage | 15.0 | Some structures and roads inundated; evacuations may begin. |
| Major flood stage | 18.0 | Extensive inundation of structures and roads; significant evacuations and rescues. |
Grand River basin — Michigan's longest river system, draining 5,572 sq mi from Hillsdale County to Lake Michigan
The Grand River is a tributary in the Grand River basin, draining surface water from Ionia County and surrounding areas. Stage and discharge readings at this gauge are part of the USGS National Water Information System and feed into NWS hydrologic forecasts and flood-warning decisions for downstream communities.
If Ionia County is under a Flood Warning that mentions the Grand River, do not drive through flooded roadways — most flood-related deaths in Michigan occur in vehicles attempting to cross water. If you live in low-lying areas near Ionia, monitor the gauge reading on this page and be prepared to move to higher ground. Sign up for NWS alerts via NOAA Weather Radio (programmed for Ionia County's SAME code) or via your local emergency-management office. The National Weather Service issues flood watches and warnings for Ionia County when this gauge approaches its action or minor flood stage.