The Middle Willamette River Floodplain COA (102 mi2) extends along the mainstem Willamette River from Willamette Falls to the confluence with the Calapooia River near Albany (river miles 26 to 120). This COA includes the river’s floodplain and adjacent uplands. This COA is adjacent to the Lower Willamette River Floodplain, Upper Willamette River Floodplain, Pudding River, Salem Hills – Ankeny NWR, Santiam Confluences, and Lukiamute River and Tributaries COAs.
Ecoregions
Key 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 that were formed through geological processes, such as glacial scouring, tectonic movements, volcanic activity and river meander cutoffs. In Oregon, natural lakes are defined as standing water bodies larger than 20 acres, including some seasonal lakes. Depth is not a reference for characterization of …
Oak Habitats
There are several oak habitat types in Oregon, where oaks comprise most of the canopy. These can include oak woodlands, oak forest, oak chaparral, and riparian oak. Oak savanna is covered in the Grasslands Key Habitat. Oaks may also co-dominate a canopy in oak/fir, oak pine, and oak hardwood habitats.
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.
Species of Greatest Conservation Need
Acorn Woodpecker (Observed)
Melanerpes formicivorus
California Myotis (Observed)
Myotis californicus
Chipping Sparrow (Observed)
Spizella passerina
Clouded Salamander (Modeled Habitat)
Aneides ferreus
Coastal Cutthroat Trout (Documented)
Oncorhynchus clarki clarki
Common Nighthawk (Observed)
Chordeiles minor
Fringed Myotis (Modeled Habitat)
Myotis thysanodes
Western Grasshopper Sparrow (Observed)
Ammodramus savannarum perpallidus
Hoary Bat (Modeled Habitat)
Lasiurus cinereus
Howellia (Observed)
Howellia aquatilis
Northern Red-legged Frog (Observed)
Rana aurora
Northern Spotted Owl (Observed)
Strix occidentalis caurina
Olive-sided Flycatcher (Observed)
Contopus cooperi
Oregon Chub (Documented)
Oregonichthys crameri
Oregon Slender Salamander (Modeled Habitat)
Batrachoseps wrighti
Oregon Vesper Sparrow (Observed)
Pooecetes gramineus affinis
Peacock larkspur (Observed)
Delphinium pavonaceum
Western Purple Martin (Observed)
Progne subis arboricola
Short-eared Owl (Observed)
Asio flammeus flammeus
Silver-haired Bat (Observed)
Lasionycteris noctivagans
Southern Torrent Salamander (Modeled Habitat)
Rhyacotriton variegatus
Townsend’s Big-eared Bat (Modeled Habitat)
Corynorhinus townsendii
Western Bluebird (Observed)
Sialia mexicana occidentalis
Western Gray Squirrel (Observed)
Sciurus griseus
Western Meadowlark (Observed)
Sturnella neglecta
Western Painted Turtle (Observed)
Chrysemys picta belli
Northwestern Pond Turtle (Observed)
Actinemys marmorata
Western Rattlesnake (Modeled Habitat)
Crotalus oreganus oreganus
Western Ridged Mussel (Observed)
Gonidea angulata
White rock larkspur (Observed)
Delphinium leucophaeum
White-breasted Nuthatch (Pacific) (Observed)
Sitta carolinensis aculeata
Willow Flycatcher (Observed)
Empidonax traillii
Yellow-breasted Chat (Observed)
Icteria virens auricollis