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| 760.0 |
FLOOD STAGE...CAPACITY OF DAM IS REACHED. SPILLWAY UTILIZED. DAM MUST RELEASE FLOW. MAJOR FLOODING LIKELY DOWNSTREAM ALL THE WAY TO ROCHESTER AREA. CO-ORDINATION NECESSARY AMONG AFFECTED AGENCIES FOR POSSIBLE EVACUATIONS. |
| 720.0 |
ACTION-ALERT STAGE. POOL SIGNIFICANTLY FULL. INCREASE MONITORING. |
| 600.0 |
CONSERVATION POOL...JUNE 15 TO NOVEMBER 1...MAINTAINED AS CLOSE TO THIS LEVEL AS POSSIBLE. |
| 584.0 |
POOL ELEVATION. TYPICAL LOW LEVEL-UNCONTROLLED. |
| 575.0 |
RIVER BED ELEVATION. |
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Latitude: 42.733000° N,
Longitude: 77.907500° W,
Horizontal Datum:
NAD83
River Stage
Reference Frame |
Gauge Height |
Flood Stage |
Uses |
| NWS stage |
0 ft |
760 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 |
N/A |
N/A |
Older USGS topographic maps, NGVD29 benchmarks |
| MSL |
N/A |
N/A |
Older USGS topographic maps, MSL benchmarks |
| Other |
0 ft |
760 ft |
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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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weather.gov 
