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| 31.8 |
This is the RECORD FLOOD LEVEL that was reached on April 22 1973. |
| 30.0 |
Major flooding begins. |
| 28.3 |
At 60,000 cfs the bridge at Highway 79 becomes flooded. |
| 27.1 |
Several homes and farm buildings near State Highways A and H are flooded. |
| 26.5 |
Highway 79 near Ashburn is closed. |
| 25.5 |
A house on the right bank near the Route A bridge is flooded. |
| 25.0 |
Moderate flooding begins. |
| 23.0 |
Left bank overflows. |
| 19.0 |
Flood Stage. Right bank overflows. Minor flooding begins. |
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Latitude: 39.612000° N,
Longitude: 91.408000° W,
Horizontal Datum:
NAD83
River Stage Reference Frame |
Gauge Height |
Flood Stage |
Uses |
| NWS stage |
0 ft |
19 ft |
Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps |
| Vertical Datum |
Elevation (gauge height = 0) |
Elevation (gauge height = flood stage) |
Elevation information source |
| NAVD88 |
N/A |
N/A |
Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps |
| NGVD 29 |
477.03 ft |
496.03 ft |
Older USGS topographic maps, NGVD29 benchmarks |
| MSL |
N/A |
N/A |
Older USGS topographic maps, MSL benchmarks |
| Other |
N/A |
N/A |
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Hydrologic Resources
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Additional Resources
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The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here. |
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NWS Information |
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