Mayfield
| Dam Name | Mayfield |
| River | Cowlitz River |
| Administration City | Washington |
| Country | United States |
| Year | 1963 |
| Dam Height | 76 |
| Dam Length | 259 |
| Area(Sqkm) | 7.4 |
| Area(Polygonal) | 7.4 |
| Capital Expenditure | 219.6 |
| Depth(M) | 29.7 |
| Avg Displacement Of Water | 142057 |
| Catchment Area In Sqkm | 3574 |
| Main Usage | Hydroelectricity |
| Status | 2: Good |
| Longitude | -122.587917 |
| Latitude | 46.50375 |
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