|
| r Chetco River (2) | r Coos River (1) | r Coquille River (1) |
| r Devils Lake (1) | r Drift Creek (Siletz) (1) | r Nehalem River (2) |
| r North Fork Alsea River (1) | r Salmon River (1) | r Siletz River (1) |
| r Siuslaw River (1) | Raccoon Flat (2) | Raccoon Slough (1) |
| Racoon Flat (1) | Rader Creek (3) | Radiocarbon (3) |
| Radiometric dating (2) | Railroad Creek (3) | Rainbos trout = Oncorhynchus mykiss (1) |
| Rainbow trout = Oncorhynchus mykiss (19) | rainbow trout=Oncorhynchus mykiss (Salmo gairdneri) (4) | Ralph Creek (1) |
| Ranawipiti Pond (1) | Randall Creek (1) | Rattlesnake Creek (1) |
| razor clam = Siliqua patula (5) | razor clam=Siliqua patula (5) | RDX (1) |
| Ready Creek (1) | recipes (1) | Record Creek (1) |
| recreactional fisheries (9) | recreation (24) | recreational fisheries (212) |
| recreational fisheries - groundfish (6) | recreational fisheries - grounfish (7) | recreational fisheries - salmon (78) |
| recreational fisheries - salmonids (3) | recreational fisheries - shellfish (163) | recreational fisheries - shellfish commercial fisheries - shellfish (1) |
| recreational fisheries – groundfish (1) | recreational fisheries – salmon (12) | recreational fisheries – shellfish (12) |
| recreational fisheries-salmon (1) | recreational fisheries-shellfish (20) | recreational fishing (5) |
| recreational fishing – salmonids (1) | recreational isheries - shellfish (1) | recreational users (3) |
| recreational uses (29) | recruitment (2) | Rector formation (1) |
| Red abalone = Haliotis rufescens (12) | Red abalone=Haliotis rufescens (4) | red alder = Alnus rubra (9) |
| red algae (6) | red elderberry = Sambucus racemosa (1) | Red Irish lord = Hemilepdotus hemilepdotus (1) |
| red Irish lord=Hemilepidotus hemilepidotus (1) | red macroalgae = Palmaria mollis (1) | red macroalgae=Palmaria mollis (1) |
| Red rock crab = Cancer productus (1) | Red rock crab = Cancer productus (4) | Red rock crab=Cancer productus (8) |
| red sea urchin = Strongylocentrotus franciscanus (1) | red shiner = Cyprinella lutrensis (1) | Red swamp crayfish = Procambarus clarkia (1) |
| red-breasted merganser=Mergus serrator (2) | Red-legged frog = Rana aurora (3) | red-tailed hawk=Buteo jamaicensis (1) |
| Red-throated loon = Gavia stellate (1) | red-throated loon=Gavia stellata (3) | Redfish Rocks (1) |
| Redfish Rocks Marine Reserve (1) | Redman Creek (1) | redside shiner = Richardsonius balteatus (1) |
| redtail surf perch = Amphistichus rhodoterus (8) | Redtop = Agrostis alba (1) | Reed canary grass = Phalaris arundinacea (3) |
| Reed canary grass=Phalaris arundinacea (1) | Reed Creek (1) | Reedsport (18) |
| Reedsport (Or.) (32) | Reedsport (Orr.) (1) | Reedsport, Or. (1) |
| Reedy Creek (2) | Reference Marsh (4) | regulations (1) |
| reintroduced species (1) | Reintroductions (2) | remote sensing (24) |
| Remy Creek (1) | Renibacterium salmoninarum (4) | reproduction (3) |
| reproductive behavior (213) | reproductive biology (10) | reptiles (11) |
| reservoirs (3) | respiration (1) | Reston (Or.) (1) |
| restoration (1) | restoration ecology (8) | Reticulate sculpin = Cottus perplexus (8) |
| Reticulate sculpin=Cottus perplexus (2) | Reynolds Creek (8) | Rhenium (1) |
| Rhepoxynius abronius (20) | Rhinoceros auklet Cerorhinca monocerata (1) | rhinoceros auklet=Cerorhinca monocerata (1) |
| Rhizosolenia species (1) | Rhode Island (2) | RIbbed limpet=Collisella digitalis (1) |
| Rice Cr. (1) | Rice Creek (5) | Richardson Creek (1) |
| Rickard Creek (1) | Rickreall Creek (1) | Riddle (4) |
| Riddle Creek (1) | Ridge subduction (1) | Riffle Creek (2) |
| ring-billed gull=Larus delawarensis (1) | Ringed crayfish = Orconectes neglectus (1) | riparian (2) |
| Riparian aareas (1) | riparian areas (12) | riparian vegetation (1) |
| riprap (3) | Riser Creek (2) | Risley Creek (1) |
| River Basin (1) | River Bend (2) | River lamprey = Lampetra ayresi (5) |
| river lamprey=Lampetra ayresi (3) | River mile 10 (3) | River mile 11 (4) |
| River Mile 14 (2) | River mile 16 (4) | River Mile 18 (1) |
| River mile 19 (1) | River Mile 2 (3) | River Mile 24 (1) |
| River Mile 3 (2) | River Mile 4 (2) | River mile 5.6 (1) |
| River Mile 6 (1) | River Mile 7 (8) | River Mile 8 (3) |
| River Mile 9 (3) | Riverend (1) | Rivers (1) |
| roads (1) | Roads End (2) | Road’s End Beach (2) |
| Roaring River Fish Hatchery (1) | Roberts Bank (1) | Roberts Creek (5) |
| Rock Creek (63) | Rock Creek (Alsea) (1) | Rock Creek (Lane) (1) |
| Rock Creek (Siletz) (2) | Rock Creek (Umpqua) (1) | Rock Creek Fish Hatchery (6) |
| Rock Creek Hatchery (3) | Rock Creek Marsh (1) | Rock creep (1) |
| Rock formations (2) | rock scallop = Crassadoma gigantea (1) | Rockaway (Or.) (5) |
| Rockaway Beach (4) | Rockaway Beach (Or.) (2) | rockfish (1) |
| Rockfish = Sebastes spp. (11) | Rockheap Creek (2) | Rocky Creek (3) |
| Rocky Point (1) | roe (1) | Rogers Creek (3) |
| Rogue (1) | Rogue Formation (1) | Rogue Reef (1) |
| Rogue Rive (1) | Rogue River (148) | Rogue River Basin (11) |
| Rogue River Bridge (1) | Rogue River estuary (153) | Roosevelt elk = Cervus canadensis roosevelti (1) |
| Roosevelt elk=Cervus elaphus roosevelti (3) | Rose Lodge (Or.) (2) | Roseburg (8) |
| Roseburg (Or.) (1) | Roseburg Formation (3) | Roseburg Or. (1) |
| Roseburg Volcanics (1) | Ross' gull=Rhodostethia rosea (2) | Rosylip sculpin = Ascelichthys rhodorus (1) |
| Rotund Lanx = Lanx subrotunda (1) | Rough piddock = Zirfaea pilsbryi (4) | Rough-skinned newt = Taricha granulosa (9) |
| Rowdy Creek (2) | Runoff (2) | Russel Creek (1) |
| Russell Creek (6) | Russell Point (1) | Rutilus symmetricus (3) |
