Oaks Bottom Wildlife Refuge is a city park of about in southeast
Portland
Portland most commonly refers to:
* Portland, Oregon, the largest city in the state of Oregon, in the Pacific Northwest region of the United States
* Portland, Maine, the largest city in the state of Maine, in the New England region of the northeas ...
, in the U.S. state of
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 ...
. Located in a floodplain along the east bank of the
Willamette River
The Willamette River ( ) is a major tributary of the Columbia River, accounting for 12 to 15 percent of the Columbia's flow. The Willamette's main stem is long, lying entirely in northwestern Oregon in the United States. Flowing northward b ...
near
Sellwood, the park is known for attracting a wide variety of birds.
In 1988, the park was named Portland's first wildlife refuge,
and in 2004, it was designated the city's first migratory bird park.
Description
The elongated park includes a shallow seasonal lake and
wetland
A wetland is a distinct ecosystem that is flooded or saturated by water, either permanently (for years or decades) or seasonally (for weeks or months). Flooding results in oxygen-free (anoxic) processes prevailing, especially in the soils. The ...
, open grassy areas, and mixed maple and oak woodlands, among other habitats.
A hiking and biking path called the
Springwater Corridor
The Springwater Corridor Trail is a bicycle and pedestrian rail trail in the Portland metropolitan area in Oregon, United States. It follows a former railway line from Boring through Gresham to Portland, where it ends south of the Eastbank Espla ...
runs through the park parallel to the Willamette River. The corridor runs alongside the Oregon Pacific Railway tracks which can be seen on a
berm
A berm is a level space, shelf, or raised barrier (usually made of compacted soil) separating areas in a vertical way, especially partway up a long slope. It can serve as a terrace road, track, path, a fortification line, a border/ separation ...
next to the path.
Slightly south of the refuge are
Sellwood Park
Sellwood Park is a city park of about in southeast Portland, in the U.S. state of Oregon.
Description and history
Located at Southeast Seventh Avenue and Miller Street, the park includes courts for tennis and basketball; fields for soccer, base ...
and
Sellwood Riverfront Park
Sellwood Riverfront Park is a city park of about in southeast Portland, in the U.S. state of Oregon. Located at Southeast Spokane Street and Oaks Parkway, the park has paths, picnic tables, a stage, a boat dock on the Willamette River, restrooms ...
.
Oaks Amusement Park
Oaks Park is a small amusement park located south of downtown Portland, Oregon, United States. The park opened in May 1905 and is one of the oldest continually operating amusement parks in the country.
The park includes midway games, about tw ...
is to the west, near the river.
To the east, the top of a
bluff
Bluff or The Bluff may refer to:
Places Australia
* Bluff, Queensland, Australia, a town
* The Bluff, Queensland (Ipswich), a rural locality in the city of Ipswich
* The Bluff, Queensland (Toowoomba Region), a rural locality
* Bluff River (New So ...
above the lake is mainly residential, though one of the buildings is a
mausoleum
A mausoleum is an external free-standing building constructed as a monument enclosing the interment space or burial chamber of a deceased person or people. A mausoleum without the person's remains is called a cenotaph. A mausoleum may be consid ...
and
crematorium
A crematorium or crematory is a venue for the cremation of the dead. Modern crematoria contain at least one cremator (also known as a crematory, retort or cremation chamber), a purpose-built furnace. In some countries a crematorium can also be ...
with a huge
great blue heron
The great blue heron (''Ardea herodias'') is a large wading bird in the heron family Ardeidae, common near the shores of open water and in wetlands over most of North America and Central America, as well as the Caribbean and the Galápagos ...
mural (''
Portland Memorial Mausoleum Mural '') overlooking the wetlands.
A hiking trail wraps around the east side of the lake beneath the bluff. A side trail connects the east trail with Sellwood Park.
To the north are mixed woodlands, shrubs, and a few open fields, and a trail crossing the north section of the refuge links the Corridor to a parking lot at the top of the bluff.
West of the north part of the refuge are two islands, East and Hardtack, that belong to the
Ross Island
Ross Island is an island formed by four volcanoes in the Ross Sea near the continent of Antarctica, off the coast of Victoria Land in McMurdo Sound. Ross Island lies within the boundaries of Ross Dependency, an area of Antarctica claimed by New ...
group in the Willamette.
Ross Island is the site of a heron
rookery
A rookery is a colony of breeding animals, generally gregarious birds.
Coming from the nesting habits of rooks, the term is used for corvids and the breeding grounds of colony-forming seabirds, marine mammals (true seals and sea lions), and ev ...
.
History
Before the Bottom became a park, the raised bed of the rail line had largely separated the wetlands from the river.
The south part of the wetlands had been altered by a sanitary
landfill
A landfill site, also known as a tip, dump, rubbish dump, garbage dump, or dumping ground, is a site for the disposal of waste materials. Landfill is the oldest and most common form of waste disposal, although the systematic burial of the waste ...
that the city acquired in 1969 to prevent its development as industrial land.
The city later filled the north end of the park with debris from construction of
Interstate 405 through downtown Portland.
The plan in the early 1970s was to fill the rest of the wetlands and to use the space for museums, perhaps a
motocross
Motocross is a form of off-road motorcycle racing held on enclosed off-road circuits. The sport evolved from motorcycle trials competitions held in the United Kingdom.
History
Motocross first evolved in Britain from motorcycle trials competi ...
course, and a
gondola lift
A gondola lift is a means of cable transport and type of aerial lift which is supported and propelled by cables from above. It consists of a loop of steel wire rope that is strung between two stations, sometimes over intermediate supp ...
to transport visitors from the top of the bluff to the park.
Public pressure from the
Audubon Society of Portland The Audubon Society of Portland is a non-profit environmental organization dedicated to wildlife conservancy in Portland, Oregon, Portland, Oregon, United States.
Founded in 1902 and incorporated in 1909, it is one of the oldest such organizations ...
, the Sellwood-Moreland Improvement League, and
The Nature Conservancy
The Nature Conservancy (TNC) is a global environmental organization headquartered in Arlington, Virginia. it works via affiliates or branches in 79 countries and territories, as well as across every state in the US.
Founded in 1951, The Natu ...
helped persuade the city to stop filling the wetlands.
In 1988, after many years of debate, officials designated Oaks Bottom as the first urban wildlife refuge in Portland.
Since then, Friends of Oaks Bottom, a volunteer group, has helped the city's parks department with trail maintenance, habitat restoration, and information services.
In 2004, the park was named the city's first migratory bird park. Portland was one of five cities to receive $50,000 grants from the
US Fish and Wildlife Service
The United States Fish and Wildlife Service (USFWS or FWS) is an agency within the United States Department of the Interior dedicated to the management of fish, wildlife, and natural habitats. The mission of the agency is "working with othe ...
to establish such parks. Thousands of migratory birds visit the refuge during their annual north–south flights.
Flora and fauna
As of 2010, more than 185 bird species have been recorded in the refuge including herons,
egret
Egrets ( ) are herons, generally long-legged wading birds, that have white or buff plumage, developing fine plumes (usually milky white) during the breeding season. Egrets are not a biologically distinct group from herons and have the same build ...
s,
hawk
Hawks are bird of prey, birds of prey of the family Accipitridae. They are widely distributed and are found on all continents except Antarctica.
* The subfamily Accipitrinae includes goshawks, sparrowhawks, sharp-shinned hawks and others. Th ...
s,
osprey
The osprey (''Pandion haliaetus''), , also called sea hawk, river hawk, and fish hawk, is a diurnal, fish-eating bird of prey with a cosmopolitan range. It is a large raptor reaching more than in length and across the wings. It is brown o ...
,
shorebird
245px, A flock of Dunlins and Red knots">Red_knot.html" ;"title="Dunlins and Red knot">Dunlins and Red knots
Waders or shorebirds are birds of the order Charadriiformes commonly found wikt:wade#Etymology 1, wading along shorelines and mudflat ...
s,
gull
Gulls, or colloquially seagulls, are seabirds of the family Laridae in the suborder Lari. They are most closely related to the terns and skimmers and only distantly related to auks, and even more distantly to waders. Until the 21st century, m ...
s,
tern
Terns are seabirds in the family Laridae that have a worldwide distribution and are normally found near the sea, rivers, or wetlands. Terns are treated as a subgroup of the family Laridae which includes gulls and skimmers and consists of e ...
s,
hummingbird
Hummingbirds are birds native to the Americas and comprise the biological family Trochilidae. With about 361 species and 113 genera, they occur from Alaska to Tierra del Fuego, but the vast majority of the species are found in the tropics aro ...
s,
woodpecker
Woodpeckers are part of the bird family Picidae, which also includes the piculets, wrynecks, and sapsuckers. Members of this family are found worldwide, except for Australia, New Guinea, New Zealand, Madagascar, and the extreme polar regions. ...
s,
grebe
Grebes () are aquatic diving birds in the order Podicipediformes . Grebes are widely distributed freshwater birds, with some species also found in marine habitats during migration and winter. Some flightless species exist as well, most notably ...
s,
falcon
Falcons () are birds of prey in the genus ''Falco'', which includes about 40 species. Falcons are widely distributed on all continents of the world except Antarctica, though closely related raptors did occur there in the Eocene.
Adult falcons ...
s,
vulture
A vulture is a bird of prey that scavenges on carrion. There are 23 extant species of vulture (including Condors). Old World vultures include 16 living species native to Europe, Africa, and Asia; New World vultures are restricted to North and ...
s,
waterfowl
Anseriformes is an order of birds also known as waterfowl that comprises about 180 living species of birds in three families: Anhimidae (three species of screamers), Anseranatidae (the magpie goose), and Anatidae, the largest family, which in ...
, and many others.
Vegetation, which varies from one part of the refuge to another, includes
Oregon white oak
''Quercus garryana'' is an oak tree species of the Pacific Northwest, with a range stretching from southern California to southwestern British Columbia. It is commonly known as the Oregon white oak or Oregon oak or, in Canada, the Garry oak. It ...
,
Pacific madrone
''Arbutus menziesii'' or Pacific madrone (commonly madrone or madrona in the United States and arbutus in Canada), is a species of broadleaf evergreen tree in the family Ericaceae, native to the western coastal areas of North America, from Bri ...
,
ash
Ash or ashes are the solid remnants of fires. Specifically, ''ash'' refers to all non-aqueous, non- gaseous residues that remain after something burns. In analytical chemistry, to analyse the mineral and metal content of chemical samples, ash ...
, and
black locust
''Robinia pseudoacacia'', commonly known in its native territory as black locust, is a medium-sized hardwood deciduous tree, belonging to the tribe Robinieae of the legume family Fabaceae. It is endemic to a few small areas of the United States ...
trees; ferns,
Oregon-grape
''Mahonia aquifolium'', the Oregon grape or holly-leaved barberry, is a species of flowering plant in the family Berberidaceae, native to western North America. It is an evergreen shrub growing tall and wide, with pinnate leaves consisting of sp ...
,
Scotch broom
''Cytisus scoparius'' ( syn. ''Sarothamnus scoparius''), the common broom or Scotch broom, is a deciduous leguminous shrub native to western and central Europe. In Britain and Ireland, the standard name is broom; this name is also used for other ...
, and
poison oak Poison oak refers to two plant species in the genus ''Toxicodendron,'' both of which can cause skin irritation:
*''Toxicodendron diversilobum'' or Western poison oak, found in western North America
*''Toxicodendron pubescens
''Toxicodendron pub ...
, as well as rushes,
sedges
The Cyperaceae are a family of graminoid (grass-like), monocotyledonous flowering plants known as sedges. The family is large, with some 5,500 known species described in about 90 genera, the largest being the "true sedges" genus ''Carex'' wit ...
, and other plants.
Invasive species, gradually being replaced by physical removal and burning, include
reed canary grass
''Phalaris arundinacea'', or reed canary grass, is a tall, perennial bunchgrass that commonly forms extensive single-species stands along the margins of lakes and streams and in wet open areas, with a wide distribution in Europe, Asia, northern ...
,
purple loosestrife
''Lythrum salicaria'' or purple loosestrifeFlora of NW Europe''Lythrum salicaria'' is a flowering plant belonging to the family Lythraceae. It should not be confused with other plants sharing the name loosestrife that are members of the family P ...
,
Himalayan blackberry
''Rubus armeniacus'', the Himalayan blackberry or Armenian blackberry, is a species of ''Rubus'' in the blackberry group ''Rubus'' subgenus ''Rubus'' series ''Discolores'' (P.J. Müll.) Focke. It is native to Armenia and Northern Iran, and wide ...
, and others.
To regulate the flow of water into and out of the wetlands, the parks department adds or removes boards at a small dam near the railroad berm. The idea is to replicate conditions that existed when the wetlands were fully connected to the river.
Part of the water in the wetlands comes from natural
springs, and part of the water comes from the river, when it runs high in the winter.
Beaver
Beavers are large, semiaquatic rodents in the genus ''Castor'' native to the temperate Northern Hemisphere. There are two extant species: the North American beaver (''Castor canadensis'') and the Eurasian beaver (''C. fiber''). Beavers ar ...
s have at times foiled the plan by damming the small stream that carries water between the lake and the river. The parks department has foiled the rodents by running a perforated pipe through the beaver dam.
References
External links
Portland's Migratory Bird ProgramSellwood–Moreland Improvement League
{{Sellwood-Moreland, Portland, Oregon
1959 establishments in Oregon
Parks in Portland, Oregon
Protected areas established in 1959
Sellwood-Moreland, Portland, Oregon
Urban public parks