| Station | Data Center | Start | End | Site | Latitude | Longitude | Elevation |
|---|---|---|---|---|---|---|---|
| HDW |
|
1979-10-15 | 2599-12-31 | Hoodsport, WA, USA | 47.648312 | -123.055496 | 1006.0 |
| HH2 |
|
1987-03-01 | 1988-08-17 | Horse Heaven Hills previous ISC code: HHH | 46.17152 | -119.384743 | 490.0 |
| HHW |
|
1984-08-03 | 1987-03-25 | Horse Heaven Hills | 46.182911 | -119.384193 | 415.0 |
| HSR |
|
1985-08-12 | 2599-12-31 | South Ridge, Mt. St. Helens, WA, USA | 46.17428 | -122.18065 | 1720.0 |
| HTW |
|
1975-06-01 | 2599-12-31 | Haystack Lookout, WA, USA | 47.80377 | -121.76887 | 833.0 |
| NAC |
|
1973-01-01 | 2599-12-31 | Naches | 46.733009 | -120.824852 | 728.0 |
| NCO |
|
1987-09-16 | 2599-12-31 | Newberry Crater, OR, USA | 43.70378 | -121.13953 | 1959.0 |
| NEL |
|
1985-05-01 | 2599-12-31 | Nelson Butte, WA, USA | 48.07802 | -120.33951 | 1499.9 |
| NEW |
|
1963-03-01 | 1995-01-01 | Newport Observatory (USGS) | 48.263889 | -117.120277 | 760.0 |
| NLO |
|
1973-01-01 | 2015-10-06 | Nicolai Mt., OR, USA | 46.08924 | -123.45173 | 826.0 |
| NSP |
|
1985-10-01 | 1986-08-31 | New Spider, Mt. St. Helens | 46.200939 | -122.188148 | 2062.0 |
| NWD |
|
1980-12-01 | 1981-05-31 | NW Dome, Mt. St. Helens | 46.209171 | -122.200706 | 2195.0 |
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