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| D River (6) | Dabob Bay (Wa.) (2) | Dabob Bay (Washington) (1) |
| Dad's Creek (2) | Daley Lake (1) | dams (120) |
| Darby Creek (1) | Darkey Creek (2) | Data (1) |
| Data visualization (1) | dataset (1) | Dating (16) |
| Davidson current (2) | Davis Creek (1) | Dawson Creek (1) |
| Days Creek (18) | Days Creek Dam (6) | DDE (1) |
| DDT (8) | Deadman Creek (8) | Deadwood Creek (Siuslaw) (2) |
| Dean Creek (9) | Dean Creek (Umpqua) (6) | Deane's Creek Bar (1) |
| Debris flow (3) | decapods (89) | decomposition (1) |
| Deep Creek (2) | Deep Cut Creek (1) | Deep Sea Drilling Project (27) |
| Deer Creek (108) | Delake (2) | Delake (Or.) (2) |
| Delaney's Rapid (1) | Delaware (1) | Deltas (2) |
| DeMersseman Creek (4) | demographics (122) | dendrochronology (1) |
| denitrification (1) | Denley Reservoir (1) | Depew Creek (2) |
| Depleted population (4) | depleted populations (236) | depleted species (1) |
| Depoe Bay (119) | Depoe Bay (Or.) (11) | Depoe Bay Basalt (1) |
| Depoe Bay Creek (1) | Depoe Bay Estuary (3) | Deposition (1) |
| Depot Creek (3) | Depot Slough (37) | depressed populations (1) |
| Derogenes species (1) | Derrick Lake (Yaquina River Basin) (1) | Deschutes River (4) |
| Deschutes River Basin, (1) | description (1) | Desmatophoca oregonensis (1) |
| Desulfobulbaceae (1) | developmental stages (89) | Devil Creek (1) |
| Devil's Lake (12) | Devils Lake (42) | Devil’s Elbow State Park (2) |
| Devil’s Lake (10) | Devil’s Punchbowl (2) | Devore Arm Creek (1) |
| Dewey Creek (1) | Diamictite (1) | Diamond Creek (2) |
| Diamond Lake (36) | Diamond Lake, North Umpqua River, Umpqua River Basin, introduced species, Tui chub = Gila bicolor, golden shiner = Notemigonus crysoleucas, tiger trout, predation, population biology (1) | Diapirism (3) |
| Diatomovora amoena (1) | diatoms (52) | diazinon (1) |
| dichotomous key (3) | Diclidophora species (1) | diet (22) |
| diet, feeding behavior, juvenile fishes, depleted populations, marine mammals, pinnipeds, (1) | digestion (1) | Digger Creek (2) |
| Digger Mountain (1) | dike removal (17) | dikes (9) |
| diking (47) | Dillard (1) | dinoflagellates (1) |
| Dirft Creek (2) | Dismal Creek (1) | dissolved oxygen (64) |
| dissolved oxygen data (17) | Dixon Creek (4) | Doe Creek (4) |
| Doemer Creek (1) | Dog Creek (2) | Dogwood Creek (2) |
| Dolerites (4) | Dolphin (2) | Domengine Formation (1) |
| Dompler Creek (1) | Domsea Farms (1) | Donegan Creek (1) |
| Donsea Farms (3) | Double Cove Point (3) | Double-crested cormorant = Phalacrocorax auritus (2) |
| double-crested cormorant=Phalacrocorax auritus (1) | Douglas aster = Symphyotrichum subspicatum (1) | Douglas County (5) |
| Douglas County (Or.) (2) | Douglas fir = Pseudotsuga menziesii (4) | Douglas-fir = Pseudostuga menziesii (1) |
| Douglas-fir = Pseudotsuga menziesii (2) | douglas-fir=Pseudostuga menziesii (4) | Dover sole = Microstomus pacificus (5) |
| Dowitcher = Limnodromus spp. (1) | dowitchers = Limnodromus spp. (3) | dragonfly = Anisoptera species (1) |
| Drain (1) | Drain Or. (1) | Drakes Estero (1) |
| dredging (205) | Drew Creek (2) | Drift Creek (165) |
| Drift Creek (Alsea) (6) | Drift Creek (Siletz) (6) | Drift Creek Bridge (2) |
| Drift Creek Landing (1) | Drift Creek Marsh (1) | Drift Creek meadows (1) |
| Drift Creek pastures (1) | Drift Creek Wilderness Area (1) | Driftwood Beach (2) |
| Drilling (24) | Drought (1) | Dry Creek (8) |
| ducks (1) | Duckweed=Lemna minor (1) | Dumont Creek (7) |
| Dunaliella species (7) | Duncan Creek (1) | Duncan Slough (1) |
| dunes (6) | Dunes City (Or.) (2) | Dungeness crab = Metacarcinus magister (Cancer magister) (24) |
| Dungeness crab = Metacarcinus magister (Cancer magister) (1) | Dungeness crab = Metacarcinus magister (1) | Dungeness crab = Metacarcinus magister (Cancer magister) (70) |
| Dungeness crab = Metacarcinus magister (Cancer magister). eelgrass = Zostera marina (1) | dungeness crab=Metacarcinus magister (Cancer magister) (37) | Dunlin = Calidris alpina (3) |
| Dunlin = Calidris alpine (2) | Dunn’s salamander = Plethodon dunni (2) | dusky Canada goose= Branta canadensis occidentalis (1) |
| Duwamish River (1) | Dykes (8) | |
