Hills in the Puget Lowland

Hills in the Puget Lowland, between the Cascades and the Olympic Mountains, including the entire Seattle metropolitan area, are generally between 350–450 feet (110–140 m) and rarely more than 500 feet (150 m) above sea level. Hills are often notable geologically and for social reasons, such as the seven hills of Seattle.

Formation

The Puget Lowland lies between the Cascades and Olympic Mountains and once contained a plateau of glacial till not usually more than 350–450 feet (110–140 m) above sea level.[1][2][3] The plateau, "the most prominent single landform of the entire region",[4] was dissected by glacial outwash, forming present-day landforms: rivers, creeks and streams; glacial lakes such as Lake Washington; and numerous kettle lakes, and Puget Sound itself. High points on the plateau remain, most of which are a drumlin (rocky glacial debris), or a bedrock intrusion that predated glaciation. Hills above 500 feet are considered exceptional.[lower-alpha 1]

Notable lowlands hills

Hills are glacial deposits unless otherwise noted. King, Pierce and Snohomish Counties run up to the crest of the Cascades where their high points reside; therefore, the Cascades and attached foothills are excluded. Likewise for Thurston County in the Mount Rainier area, and Mason County's Olympic Mountains foothills.

North Sound

Landforms north of the Tacoma Narrows (Island, King, Kitsap, Pierce and Snohomish counties)

Island County

Whidbey Island and Camano Island are islands in Puget Sound and form the bulk of Island County.

  • Whidbey Island high point, 520–540 feet (160–160 m)[6] unnamed peak 500 meters from Naval Air Station Whidbey Island
  • Camano Island high point, 580 feet (180 m) unnamed peak, the lowest high point of any Washington county[7]

King County

Seattle

Kitsap County

The Blue Hills of the Kitsap Peninsula are unusual in that they are composed of basalt bedrock, not glacial till.[12]

  • Gold Mountain, 1,761 feet (537 m) (Kitsap County h.p. & city of Bremerton watershed on mountain contains city h.p.)
  • Green Mountain, 1,639 feet (500 m)

Bainbridge Island is an island in Puget Sound.

  • Toe Jam Hill, Bainbridge Island's high point, 425 feet (130 m)

Pierce County

  • South Hill above Puyallup, 541 feet (165 m)[13]
  • Argonne Forest hills at Fort Lewis, formed of multiple layers of till deposited during Vashon glaciation; some hills may overlie drumlins from an earlier glacial phase.[14] Hills are designated critical habitat for the Northern Spotted Owl, an endangered species whose forest habitat in the Puget Lowland has been largely destroyed.[15]

Snohomish County

South Puget Sound

Landforms in South Puget Sound (Thurston and Mason counties)

Low mountains

The Issaquah Alps Bellevue, Issaquah and Newcastle on the Eastside are considered part of the Cascades foothills by many authors.[lower-alpha 2] They are basalt intrusions possibly related to the Blue Hills of the Kitsap Peninsula. Highest point Tiger Mountain summit, 3,004 feet (916 m).

The Anacortes Community Forest Lands contain several peaks over 1,000 feet (300 m) high, including the Fidalgo Island high point, 1,273-foot (388 m) Mount Erie.

Mason County's Olympic Mountains foothills are called the Satsop Hills.

See also

Footnotes

  1. ↑ "The elevation is, with some local exceptions, less than 150 meters (500 feet) above sea level. Much of the landscape consists of rolling hills with a relief of only a few hundred feet."[5]
  2. ↑ "Westernmost encroachment of the Cascades into the lowland contains exposures of preglacial bedrock marked by a series of peaks ... including Tiger and Squak mountains"[5]

References

  1. ↑ Williams 2000 p. 87
  2. ↑ USDA 1952 p.5
  3. ↑ Figge 2008 p. 27
  4. ↑ Booth 1994.
  5. 1 2 Burns 1985, p. 54.
  6. ↑ "Whidbey Island High Point, Washington". Peakbagger.com.
  7. ↑ Martin 1994
  8. ↑ U.S. Geological Survey Geographic Names Information System: Finn Hill, King County, Washington
  9. 1 2 3 Raisz 1941
  10. ↑ "Kirkland high point". Peakbagger.com. Retrieved December 15, 2016.
  11. ↑ "Redmond High Point, Washington". Peakbagger.com.
  12. ↑ Haeussler & Clark 2000.
  13. ↑ U.S. Geological Survey Geographic Names Information System: South Hill, Pierce County, Washington
  14. ↑ Fort Lewis forestry plan, p. 8
  15. ↑ Fort Lewis forestry plan, p. 30
  16. ↑ "Black Hill, Washington". Peakbagger.com.
  17. ↑ U.S. Geological Survey Geographic Names Information System: Black Hill, Pierce County, Washington
  18. ↑ "Heaton Hill, Washington". Peakbagger.com.
  19. 1 2 3 DeLorme 2002 p. 62
  20. ↑ U.S. Geological Survey Geographic Names Information System: Heaton Hill, Pierce County, Washington
  21. ↑ "Kelly Hill, Washington". Peakbagger.com.
  22. ↑ "Starr Hill, Washington". Peakbagger.com.
  23. ↑ U.S. Geological Survey Geographic Names Information System: Starr Hill, Pierce County, Washington
  24. ↑ "Lake Serene Hill, Washington". Peakbagger.com.
  25. ↑ U.S. Geological Survey Geographic Names Information System: Clearview, Washington
  26. ↑ Drost et al. 1998, p. 10

Sources

  • Booth, Derek (August 1994), "Glaciofluvial infilling and scour of the Puget Lowland, Washington, during ice-sheet glaciation", Geology, The Geological Society of America, 22 (8), pp. 695–698, doi:10.1130/0091-7613(1994)022<0695:GIASOT>2.3.CO;2 (PDF from UW)
  • Burns, Robert (1985), The Shape & Form of Puget Sound, University of Washington Press, ISBN 0295961848
  • Washington Atlas and Gazetteer (sixth ed.), DeLorme, 2002, ISBN 0-89933-329-X
  • B.W. Drost, G.L. Turney, N.P. Dion, and M.A. Jones (1998), Hydrology and Quality of Ground Water in Northern Thurston County, Washington (PDF), United States Geological Survey, p. 10, report 92-4109
  • Figge, John (2008), "The modern landscape of the Puget Sound basin", The Glacial Origins of the Puget Basin (PDF), The Northwest Geological Institute, pp. 27–29
  • Lapham, Macy H. (September 1952), Soil survey of King County, Washington, Soil survey, United States Department of Agriculture, series 1938 number 31
  • Martin, Andy (1994). County high points: For all western and northeastern states. Old Adit Press. ISBN 0962876216. List maintained at Peakbagger.com
  • Haeussler, P. J.; Clark, K. M. (2000), "Geologic map of the Wildcat Lake 7.5' quadrangle, Kitsap and Mason Counties, Washington" (PDF), U. S. Geological Survey, Open File Report 00-356, 1 sheet, scale 1:24,000, archived from the original (PDF) on 2013-02-19
  • Raisz, Erwin (1989), "Washington State landforms map", in Scott, James William, Washington, a Centennial Atlas, Bellingham, Washington: Center for Pacific Northwest Studies, Western Washington University, p. 4, ISBN 0929008243 – 1941 original hand-penned map, 1965 third revision
  • Williams, David B. (2000). The Seattle Street-Smart Naturalist: Field Notes from the City. Westwinds Press. ISBN 9781558688599.
  • Forestry Program, Environmental and Natural Resources Division, U.S. Army, Installation Management Agency Fort Lewis Military Reservation (May 2005), A forest management strategy for the Fort Lewis military reservation, Washington (PDF)

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