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| 23.0 |
the Elwha River will cause major flooding. Deep and swift flood waters will inundate roads...farm lands...and residential areas. Erosion will likely damage river banks. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Elwha River Basin. |
| 21.5 |
the Elwha River will flood roads...much of the pasture land along the river...and several residential areas. Erosion may damage river banks |
| 20.0 |
the Elwha River will flood roads and pasture lands along the river...with flood waters encroaching on some residential areas |
| 18.0 |
the Elwha River will locally spill over its banks |
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Latitude: 48.055000° N,
Longitude: 123.582000° W,
Horizontal Datum:
NAD83
River Stage
Reference Frame |
Gauge Height |
Flood Stage |
Uses |
| NWS stage |
0 ft |
20 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 |
200 ft |
220 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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weather.gov 
