In 1850 Henry Shepherd and family were living in Jefferson, Henry Co., IA.
Henry Shepherd, b. NY, 43, farmer.
Sarah, wife, b. NY, 25.
Nancy P., b. IA, 13.
Elizabeth, b. IA, 9.
Lewis, b. IA, 1/12.
In 1856 a Lewis Shepard was living in Burlington, Des Moines Co., IA. He was living with the Crap [no typo] family and other unrelated people.
Lewis Shepard, b. IA, resident of state 6 yrs, 6 yrs old.
There was also a Sarah Shepard, b. NY, 37 yrs old, resident IA 8 years. Source: Iowa State Census Collection 1836-1925, State Historical Society of Iowa, Heritage Quest, Ancestry.
In 1870 I found Henry Shephard living with the Vanderpoole family in Washington Co., OR.
F. M. Vanderpoole, b. NC, 37, carpenter.
Nancy P., wife [Henry's dau?] b. IA, 33.
William L., b. OR, 13.
Henry T., b. OR, 9
Charles E., b. Wash. Terr., 4,
Mary L., b. OR, 1.
Henry Shephard, b. NY, 63.
Simmons, Nancy, b. OR, 15.
You found the 1880 Polk Co., OR Census.
In 1889 Henry Shepard and Mary A. Shepard divorced. County=Polk. Source=Genealogical. Case #=2119. Source: Oregon Historical Records Index, genealogy.state.or.us/detail.php?id=16011. Go to this web site and you can request more info from the State of Oregon.
In 1900 Henry Shepard was living with the Blum family in West Chehalem, Yamhill Co., OR.
John Blum, b. Germany, b. April 1831, marr 4 yrs, farmer.
Nancy P., wife, b. IA, b. Oct 1837, had given birth to ten children but only eight alive in 1900.
George E. Vanderpool, stepson, b. OR Sept. 1877, single, farm laborer.
Henry Shephard, fatherlaw, b. NY, June 1807, widow, 92.
I didn't find Henry in the death index but that was before [assuming he died in the next 10 years) Oregon required death certs.
You can contact Random Acts Genealogical Kindness and ask the volunteer if she can find his obituary. Go to raogk.org/, read guidelines, choose Oregon, choose Yamhill Co.
I think Nancy Vanderpool was Henry's daughter. In 1860 she was living with her family in Fall River, Wasco Co., OR.
Marion Vanderpool, head household, b. NC, 30, farmer.
Nancy, wife, b. IA, 22.
William Lewis, b. OR, 4.
Matilda Lewis, b. Wash. Terr, 2.
In 1880 Nancy and family were living in West Chehalem, Yamhill Co., OR.
Francis Vanderpool, head household, b. NC, 49, carpenter w/ heart disease.
Nancy P., b. IA, 42, father born-NY, mother born=Germany.
William S., b. OR, 23, carpenter.
Henry T., b. OR, 19, works on farm.
Lodernia or Sodemia A., dau, b. OR, 11.
Elizabeth, b. OR, 8.
Marks M., b. OR, 5.
George E., b. OR, 2.
Rosa E., b. OR, 3 months.
A John Blum, Date=1902, Record Type=Estate, Coounty=Yamhill, Source=Genealogical, Case #=0999. Source: Oregon Historical Records Index, genealogy.state.or.us/detail.php?id=92.
A Johannes Blum died Oct 25, 1906, Portland [which could have been Clackamas or Multnomah Co.], Source=Portland, Identifier=Vol. 6. Source=Oregon Historical Records Index, genealogy.state.or.us/detail.php?id=188042.
A John Edward Blum died May 24, 1908, Record Type=Portland Deaths, Source=Portland, Identifier=Vol. 7. Source: Oregon Historical Records Index, genealogy.state.or.us/detail.php?id=191689.
In 1910 Nancy P. Blum was living with Frank Tolson in West Chehalem, Yamhill Co., OR.
Frank J. Tolson, head household, b. OR, 36, single, general farmer.
Nancy P. Blum, b. IA, 73, foster mother, widow, had given birth to ten children but only seven alive in 1910.
Albert Wolsey, b. WA, 15, foster son.
Frederick Hankle, b. WA, 11, foster son.
I did find some info about Riley Riggs who I think was Rannitt Riggs. In 1900 Rannitt R. Riggs and family was living in Bridgeport, Polk Co., OR.
Rannitt R. Riggs, head household, b. OR March 1868, single, farmer.
Mary A. Anderson, Aunt, b. MO, Dec. 1830, widow, farmer.
Tallitha C. Riggs, aunt, b. KY, March 1837, marr, gave birth to five children who are all alive.
Morris J. Riggs, nephew, b. OR, May 1880, single, farm laborer.
In 1910 A Rannie P. Riggs and family were living in Bridgeport.
Rannie P. Riggs, head, b. OR, 42, marr 4 yrs, general farmer.
Mattie, b. ?, 33.
George, b. OR, 2.
Andrie, b. OR, 10/12ths.
In 1920 a R. Raney Riggs was living in Bridgeport with his family.
R. Raney Riggs, b. OR, 51, general farmer.
G. Mattie, wife, b. NE, 43.
W. George, b. OR, 12.
O. Audrey, b. OR, 10.
A. Mable, b. OR, 5 5/12ths.
In 1930 Rannie and family were still living in Bridgeport.
Rannie R. Riggs, b. WI, 62, marr @ 29.
Mattie J., wife, b. OR, 53, farm laborer, marr @ 18.
George W., b. OR, 22.
Audrey O., b. OR, 20.
Mabel A., b. OR, 15.
Hope this helps & successsful searching!