Dunthorpe, Oregon

Coordinates: 45°26′9″N 122°39′14″W / 45.43583°N 122.65389°W / 45.43583; -122.65389
From Wikipedia, the free encyclopedia
Entrance to Elk Rock Gardens of the Bishop's Close in Dunthorpe
Dunthorpe is located in Oregon
Location within the state of Oregon
Dunthorpe is located in the United States
Dunthorpe (the United States)
Coordinates: 45°26′9″N 122°39′14″W / 45.43583°N 122.65389°W / 45.43583; -122.65389
CountryUnited States
 • Total1.19 sq mi (3.08 km2)
 • Land1.05 sq mi (2.72 km2)
 • Water0.14 sq mi (0.36 km2)
 • Total1,704
 • Density1,619.77/sq mi (625.47/km2)
Time zoneUTC-8 (Pacific (PST))
 • Summer (DST)UTC-7 (PDT)
ZIP code
Area code(s)503 and 971
FIPS code41-21215
GNIS feature ID1136234[3]

Dunthorpe is an affluent[4] unincorporated suburb of Portland, Oregon, United States. It is located just south of the Portland city limits and north of the Multnomah County line on the west side of the Willamette River. Lewis & Clark College, Tryon Creek State Park, and Lake Oswego are nearby. Since 2020, it has been designated as a Census Designated Place


Historical population
U.S. Decennial Census[5][2]


In January 1916, William M. Ladd's Ladd Estate Company purchased 215 acres (0.87 km2) from the soon to be dissolved Oregon Iron & Steel Company for $1.[6] The company drafted very specific provisions for the Dunthorpe development, including: Only residential buildings were allowed, except for outbuildings to house domestic animals; Swine and goats were prohibited; The minimum cost of a house was $3000; No residence could be used or occupied by "persons of African or Mongolian descent" unless they were employed as servants of the masters; and the sale of "intoxicating liquor" was also prohibited.[6]

Arts and culture[edit]

Museums and other points of interest[edit]

One of the notable attractions of the area is the Elk Rock Gardens of the Bishop's Close, an estate which consists of 13 acres (53,000 m2) on a high bluff on the western bank of the Willamette River. The property includes approximately 6 acres (2.4 ha) of cultivated English-style gardens that were designed by the New York firm of Olmsted and Son, who also designed Central Park in New York City.[6] The garden is open to the public seven days a week and is widely known for the many varieties of magnolias as well as for examples of many other native and exotic plants.[7]


Riverdale School District, which includes Dunthorpe,[8] was, as of 2017, among the best academically performing school districts in Oregon by various measures, including standardized test scores, which are frequently the best in the state.[4] According to 24/7 Wall St.'s analysis of U.S. Census data from 2006 through 2010, the Riverdale School District is the third richest school district in the United States.[9][10][11][12]

As a community, Dunthorpe was historically anchored by Riverdale Grade School. In the early 1990s, the Oregon legislature decreed that all school districts should have both primary and secondary schools, and expected smaller school districts like Riverdale to merge. While an old grade school was purchased and renovated for use as Riverdale High School, high school students were bussed to nearby Marylhurst University in the neighboring city of West Linn, where space was leased by the school district.

In September 2002, the high school moved into its permanent building, a renovation and expansion of an existing but unused public school structure. In November 2008, the voters of Riverdale School District passed a measure authorizing the District to issue bonds in an amount up to $21.5 million to renovate and expand the existing grade school building.[13] In July 2009, the original grade school was demolished.[14] The building was rebuilt in the style of the original in 2010.

Notable residents[edit]


  1. ^ "ArcGIS REST Services Directory". United States Census Bureau. Retrieved October 12, 2022.
  2. ^ a b "Census Population API". United States Census Bureau. Retrieved Oct 12, 2022.
  3. ^ "Dunthorpe, Oregon". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
  4. ^ a b "Riverdale educators offer tips for schools wanting to boost student achievement". OregonLive.com. Retrieved 2017-09-20.
  5. ^ "Census of Population and Housing". Census.gov. Retrieved June 4, 2016.
  6. ^ a b c MacColl, E. Kimbark. The Growth of a City: Power and Politics in Portland, Oregon 1915-1950. Portland, Oregon: The Georgian Press. ISBN 0-9603408-1-5.
  7. ^ The Bishop's Close Archived 2009-06-09 at the Wayback Machine - Episcopal Church, Oregon Diocese
  8. ^ U.S. Census Bureau Geography Division (December 18, 2020). 2020 Census – School District Reference Map: Multnomah County, OR (PDF) (Map). 1:184,230. United States Census Bureau. Retrieved May 19, 2023.
  9. ^ "America's Richest School Districts - 24/7 Wall St". 247wallst.com. 6 June 2012. Retrieved 21 December 2014.
  10. ^ "America's Richest School Districts". Fox Business. Archived from the original on 4 October 2014. Retrieved 21 December 2014.
  11. ^ Kuczynskibrown, Alex (2012-06-08). "The Richest School Districts In America". Huffington Post.
  12. ^ "Riverdale School District ranks as one of the nation's richest public school systems". The Oregonian. 2012-06-11.
  13. ^ [1] Archived February 8, 2009, at the Wayback Machine
  14. ^ "Riverdale Grade School comes down after controversy". The Oregonian. 2009-07-07. Retrieved 2009-07-12.

External links[edit]