Foster is an

unincorporated community An unincorporated area is a region that is not governed by a local municipal corporation. Widespread unincorporated communities and areas are a distinguishing feature of the United States and Canada. Most other countries of the world either have ...

partly within the city of

Sweet Home Sweet Home or Sweethome may refer to: Places in the United States * Sweet Home, Arkansas * Sweet Home Central School District in Amherst and Tonawanda, New York ** Sweet Home High School (Amherst, New York), a New York State public high school * ...

in Linn County,

Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...

. It is located on the western end of the

Foster Reservoir Foster Reservoir is a reservoir created by Foster Dam on the South Santiam River in the city of Foster, Oregon, United States. The reservoir is approximately long and covers approximately when full. Primary use of the reservoir is recreation i ...

. A post office named Foster serves ZIP code 97345, which serves areas beyond the Sweet Home city limits on both the north and south sides of Foster Lake: on the north side, the area extends along the

Middle Santiam River The Middle Santiam River is a tributary of the South Santiam River, long, in western Oregon in the United States. It drains a remote area of the Cascade Range east of Sweet Home in the watershed of the Willamette River. It rises in the Cascades ...

to the west end of Green Peter Lake; on the south, the area extends for several miles along the

South Santiam River The South Santiam River is a tributary of the Santiam River, about long, in western Oregon in the United States. It drains an area of the Cascade Range into the Willamette Valley east of Corvallis. It rises in the Cascades in southeastern Linn ...

and

U.S. Route 20 U.S. Route 20 or U.S. Highway 20 (US 20) is an east–west United States Numbered Highway that stretches from the Pacific Northwest east to New England. The "0" in its route number indicates that US 20 is a major coast-to-coast route. S ...

Climate

This region experiences warm and dry summers, with no average monthly temperatures above 71.6 °F. According to the

Köppen Climate Classification The Köppen climate classification is one of the most widely used climate classification systems. It was first published by German-Russian climatologist Wladimir Köppen (1846–1940) in 1884, with several later modifications by Köppen, notabl ...

system, Foster has a

warm-summer Mediterranean climate A Mediterranean climate (also called a dry summer temperate climate ''Cs'') is a temperate climate sub-type, generally characterized by warm, dry summers and mild, fairly wet winters; these weather conditions are typically experienced in the ...

, abbreviated "CSB" on climate maps.Climate Summary for Foster, Oregon
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References

Unincorporated communities in Linn County, Oregon Unincorporated communities in Oregon {{LinnCountyOR-geo-stub