Smithwick Haydite Quarry
From Underfoot
Q49449756
mine in Washington County, Oregon, United States of America
| Type | Subtype | Date | Description | Notes | Source |
|---|---|---|---|---|---|
| site | tunnel | Portland and Southwestern Railroad Tunnel | railway tunnel | Wikidata | |
| site | tunnel | Sunset Tunnel | road tunnel | Wikidata | |
