Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Type | Year Built | Where Built | Initial Owners |
| --- | --- | --- | --- | --- |
| Mountain Buck | side | 1857.0 | Portland | Ruckle & Olmstead |
| Hassaloe | stern | 1858.0 | Cascades, Washington | Bradford Bros. |
| Carrie Ladd | stern | 1858.0 | Oregon City | Jacob Kamm & John C. Ainsworth |
| Julia(Barclay) | stern | 1858.0 | Port Blakely | Oregon Steam Navigation Co. |
| Wasco | stern | 1858.0 | Port Blakeley | Oregon Steam Navigation Co. |
Question:
Who were the initial owners of Wasco in 1858?
Answer:
Oregon Steam Navigation Co.