Area includes the Tualatin River and floodplain, numerous tributaries, and associated uplands from the confluence with the Willamette River upstream to Patton Valley, west of Gaston.
COA ID: 064
Ecoregions
Strategy Habitats
Grasslands
Grasslands include a variety of upland grass-dominated habitats, such as upland prairies, coastal bluffs, and montane grasslands.
Natural Lakes
Natural lakes are relatively large bodies of freshwater surrounded by land. For the purposes of the Conservation Strategy, natural lakes are defined as standing water bodies larger than 20 acres, including some seasonal lakes.
Oak Woodlands
Oak woodlands are characterized by an open canopy dominated by Oregon white oak.
Flowing Water and Riparian Habitats
Flowing Water and Riparian Habitats include all naturally occurring flowing freshwater streams and rivers throughout Oregon as well as the adjacent riparian habitat.
Wetlands
Wetlands are covered with water during all or part of the year. Permanently wet habitats include backwater sloughs, oxbow lakes, and marshes, while seasonally wet habitats include seasonal ponds, vernal pools, and wet prairies.
Strategy Species
Acorn Woodpecker (Observed)
Melanerpes formicivorus
California Floater Freshwater Mussel (Observed)
Anodonta californiensis
California Myotis (Observed)
Myotis californicus
Chipping Sparrow (Observed)
Spizella passerina
Clouded Salamander (Modeled Habitat)
Aneides ferreus
Coastal Cutthroat Trout (Documented)
Oncorhynchus clarki clarki
Columbia Torrent Salamander (Modeled Habitat)
Rhyacotriton kezeri
Common Nighthawk (Observed)
Chordeiles minor
Fringed Myotis (Modeled Habitat)
Myotis thysanodes
Hoary Bat (Modeled Habitat)
Lasiurus cinereus
Lewis’s Woodpecker (Observed)
Melanerpes lewis
Northern Red-legged Frog (Observed)
Rana aurora
Nelson’s Checkermallow (Observed)
Sidalcea nelsoniana
Northern Spotted Owl (Observed)
Strix occidentalis caurina
Olive-sided Flycatcher (Observed)
Contopus cooperi
Oregon Slender Salamander (Modeled Habitat)
Batrachoseps wrighti
Oregon Vesper Sparrow (Observed)
Pooecetes gramineus affinis
Purple Martin (Observed)
Progne subis arboricola
Short-eared Owl (Observed)
Asio flammeus flammeus
Silver-haired Bat (Modeled Habitat)
Lasionycteris noctivagans
Townsend’s Big-eared Bat (Observed)
Corynorhinus townsendii
Western Bluebird (Observed)
Sialia mexicana
Western Gray Squirrel (Observed)
Sciurus griseus
Western Meadowlark (Observed)
Sturnella neglecta
Western Painted Turtle (Observed)
Chrysemys picta bellii
Northwestern Pond Turtle (Observed)
Actinemys marmorata
Western Ridged Mussel (Observed)
Gonidea angulata
White Rock Larkspur (Observed)
Delphinium leucophaeum
Willow Flycatcher (Observed)
Empidonax traillii
Winged Floater Freshwater Mussel (Observed)
Anodonta nuttalliana
Yellow-breasted Chat (Observed)
Icteria virens auricollis