First Mass2 documented first Masses along this route, mapped in chronological order.
Route
| # | Date | Location | Priest |
|---|---|---|---|
| 1 | December 16, 1838 | Cowlitz Prairie (Saint Francis Xavier Mission), Washington | Fr. François Norbert Blanchet |
| 2 | January 6, 1839 | St. Paul, French Prarie, Oregon | Fr. François Norbert Blanchet |