The record that P. Hopkins found for you that shows Halvor Halvorsen Sandblost leaving the parish in 1877 shows that he is going to the Lofoten Islands, in northern Norway, a big fishing area that needed many young men to work on the fishing fleet.It is not his emigration to America.
Here is another genealogist (unless it's you?) who is searching for information about this family, and received some help online:
Sandblast Hal H birth:8 Oct 1854 NOR Halvor H Sandblast NOR Death: 13 Apr 1930 cremated
So This information that P. Hopkins found for you earlier, matches the birth information on the Oregon records. Here is what P. Hopkins found for you:
So Halvor's birth/baptism record is found in Kvernes church books of Møre og Romsdal. It lists him as born out of wedlock to bachelor Halvor Jensen and the unmarried woman Olava Hansdatter. The first baptismal witness listed on that record is the same man that is the head of household seen above in the 1865 census where Halvor was living. The Kvernes record lists his birth date as 8 Oct 1854. http://www.arkivverket.no/URN:kb_read?idx_kildeid=2282&idx_id=2282&uid=ny&idx_side=-23http://www.arkivverket.no/URN:kb_read?idx_kildeid=2282&idx_id=2282&uid=ny&idx_side=-23
The link that P. Hopkins gave you for Halvor on the 1865 census was a good one.Best match.
The mother's best match shows her living on Sandblost farm, but married in 1865 to someone besides Halvor's father.
Name Family status Marital status Occupation Birth year Place of birth Ethnicity Nils Olsen Husfader g Gaardb. og Selveier 1840 Bod Prgj. Olava Hansdatter hans Kone g1836 Bod Prgj. Ole Nielsen deres Søn ug1861 Bod Prgj. Hanna Nilsdatter deres Datter ug1863 Bod Prgj.
She has a son and a daughter that belong to this husband.
There may still be relatives living at Sandblost/Sandblåst today?This could explain why he took that last name when he emigrated, perhaps he was living back with his mother at an older age before he emigrated to America.
Now look at the same farm, 35 years later. in 1900. Sandblost.
Name Family status Marital status Occupation Birth year Place of birth Ethnicity Nils Olsen hf g Jordbrug S 1836 Bud Rom Olava Hansdatter hm g1834 Bud Rom Ole Nilsen s ug Jordbrug 1860 Bud Rom Beret Olava Nilsdatter d ug Husgjerning og Kreaturstel 1873 Bud Rom Elen Gurine Nilsdatter d ug Husgjerning og Kreaturstel 1875 Bud Rom Robert Nilsen s ug Fiskeri 1869 Bud Rom Hans Oluf Nilsen s ug Fiskeri 1878 Bud Rom Ovidia Halvorsdatter d ug*1891 Bud Rom Olaf Karlsen s ug*1898 Bud Rom
The mother Olava Hansdatter is still there, there are several Nilsen children (children of Olava and Nils) and two foster children.
Name Family status Marital status Occupation Birth year Place of birth Ethnicity Nils Ols. Sandblost hf g gaardbruger Selveier 02.02.1836 t Olava Hansd. hm g gaardbrugerkone 20.01.1834 t Ole Nils. s ug tjenestegut paa gaarden 04.04.1860 t Beret Olava Nilsd. d ug tjenestepige paa gaarden 11.08.1871 t Ovidie Halvorsd. tj ug tjenestepige paa gaarden 10.06.1891 t Olaf Karls. pls. ug pleiebarn 13.07.1898 t