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| Wade Creek (1) | Waggoner Creek (1) | Waldport (2) |
| Waldport (Or.) (26) | Walker Creek (2) | Wallace Creek (1) |
| Walleye surf perch = Hyperprosopon argenteum (2) | walleye surfperch = Hyperprosopon argenteum (1) | walleye surfperch=Hyperprosopon argenteum (4) |
| Walton (Or.) (1) | Wapiti Creek (1) | Wapiti Formation (2) |
| Warnick Creek (2) | Warnick Falls (1) | Warrenton (Or.) (1) |
| Washington (402) | Washington (State) (2) | Washington (State), Oregon, Puget Sound, Netarts Bay, general, climate change, ocean acidification, environmental law and policy (1) |
| Wassen Creek (2) | Wasson Lake (1) | Waste (2) |
| waste disposal (48) | water availability (1) | water data (2) |
| Water Plant Creek (1) | water pollution (240) | water qpollution (1) |
| water quality (369) | water quality data (33) | water quality statistics (1) |
| water quality. water temperature (1) | water resources (1) | water rights (47) |
| water supply (5) | water temperature (356) | water temperature data (87) |
| water temperature. Winchester Bay (1) | water temperatures (1) | water temperatures. Buck Creek (1) |
| water use (114) | Water-starwort=Callitriche heterophylla (1) | watershed councils (1) |
| watersheds (1) | wave data (17) | wave height (32) |
| wave height data (17) | wave heights (6) | waves (2) |
| weather (39) | Weatherly Creek (2) | Weatherly Creek (Umpqua) (4) |
| weathervane scallop=Patinopecten caurinus (1) | Weaver Creek (3) | Wee Willie's (2) |
| Wee Willy (1) | Weeks Bay (1) | weirs (6) |
| Weiser Point (8) | Wells (Maine) (1) | Wells Creek (1) |
| Wenatchee River (1) | West Fork Cow Creek (3) | West Fork Elk Valley (1) |
| West Fork Indian Creek (1) | West Fork Millicoma River (2) | West Fork Olalla Creek (1) |
| West Fork Smith River (27) | West Fork Smith River (Umpqua) (2) | west of Yaquina Bay Bridge (30) |
| West Olalla Creek (2) | West Twin Lake (1) | Westcott Bay (Wa.) (1) |
| Western brook lamprey = Lampetra richardsoni (31) | western brook lamprey= Lampetra richardsoni (1) | Western brook lamprey=Lampetra richardsoni (3) |
| western grebe=Aechmophorus occidentalis (3) | Western gull = Larus occidentalis (3) | western gull=Larus occidentalis (7) |
| Western hemlock = Tsuga heterophylla (3) | Western pearl mussel = Margaritifera falcata (3) | Western pearlshell = Margaritifera falcata (1) |
| Western pond turtle = Actinemys marmorata (Clemmys marmorata) (3) | Western red-backed salamander = Plethodon vehiculum (2) | Western redback salamander = Plethodon vehiculum (1) |
| Western ridged mussel = Gonidea angulata) (1) | Western ridged mussel = Gonidea angulate (1) | western sandpiper = Calidris mauri (6) |
| Western snowy plover = Charadrius alexandrinus nivosus (2) | Westport (Wa.) (1) | Westport (Wash.) (1) |
| wetland (1) | wetland delineation (90) | wetland mitigation (14) |
| wetland restoration (23) | wetland vegetation (97) | wetland vegetation. zonal distribution (2) |
| wetland zonation (1) | wetlands (56) | wetlands vegetation (1) |
| Whale Cove (21) | Whales Head Rock (1) | Whaleshead (1) |
| whaling (2) | Wheeler (Or.) (3) | whimbrel=Numenius phaeopus (3) |
| Whiskey Camp Creek (1) | Whiskey Cr. (1) | Whiskey Creek (34) |
| Whiskey Creek Hatchery (3) | Whiskey Creek Salmon Hatchery (1) | Whiskey Creek Shellfish Hatchery (9) |
| Whiskey Creek Shellfish Hatchery, (1) | Whistler's Bend (1) | White Creek (4) |
| White Rock Creek (1) | White Salmon River (1) | White seaperch = Phanerodon furcatus (3) |
| white seaperch=Phanerodon furcatus (2) | White sturgeon = Acipenser transmontanus (19) | White sturgeon = Acipenser transmontanus. sharks (1) |
| white sturgeon=Acipenser transmontanus (4) | white surfperch = Phanerodon furcatus (1) | white-fronted goose=Anser albifrons (2) |
| white-sand macoma = Macoma secta (1) | white-sand macoma=Macoma secta (5) | White-winged scoter = Melanitta fusca (1) |
| Whitebait smelt = Allosmerus elongates (4) | Whitehorse Creek (1) | Whittaker Creek (2) |
| Widow Creek (2) | widow rockfish=Sebastes entomelas (2) | wild salmoids (2) |
| wild salmonids (138) | Wildcat Creek (10) | Wildcat Creek (Siuslaw) (1) |
| wilderness (4) | wildlife (8) | Willamette and Umpqua National Forests (1) |
| Willamette Fish Hatchery (1) | Willamette National Forest (1) | Willamette River (14) |
| Willamette River Basin (10) | Willamette River Basin, Siletz River, Signal crayfish = Pacifastacus leniusculus, Ringed crayfish = Faxonius neglectus neglectus (Orconectes n. neglectus), introduced species, crustaceans, microbes, life history, diet, community ecology (1) | Willamette Valley (1) |
| Willamson Creek (1) | Willapa Bay (30) | Willapa Bay (Wa.) (4) |
| Willapa River (1) | William Creek (1) | Williams Creek (6) |
| Williams Creek (Alsea) (1) | Williamson Creek (3) | Willis (1) |
| Willis Creek (3) | Willow Creek (1) | Willow Sump (1) |
| Wilson - Trask – Nestucca (1) | Wilson Creek (4) | Wilson Creek (5 Rivers) (1) |
| Wilson Rive (1) | Wilson River (114) | Wilson's Snipe = Gallinago delicate (2) |
| Winant (20) | Winant (Hinton's) Slough (1) | Winant Slough (Yaquina) (1) |
| Winchester (6) | Winchester (Or.) (1) | Winchester Baldy (1) |
| Winchester Baldy Mountain (1) | Winchester Bay (112) | Winchester Bay (Or.) (4) |
| Winchester Creek (7) | Winchester Creek (Coos Bay) (2) | Winchester Dam (59) |
| Winchester Marsh (1) | Winchuck River (11) | wind (24) |
| Wind Creek (1) | wind data (8) | Windchuck River (3) |
| winds (3) | Windy Cove County Park (2) | Windy Creek (5) |
| Winshuck River estuary (2) | Winston (6) | Winston Bridge (1) |
| Winters Creek (2) | Wittrockiella amphibia (Collins) comb. nov. (1) | Wittrockiella paradoxa (1) |
| Wolf Creek (15) | Wolf-eel = Amarrhichthys ocellatus (2) | Wolverine Creek (2) |
| Wood Creek (3) | Wood duck = Aix sponsa (1) | Woodford Creek (2) |
| Wood’s Bay (1) | Woosley Creek (1) | worms (2) |
| Wright Creek (16) | Wuchihshan Formation (1) | Wyoming (12) |
