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| l hatchery salmonids (1) | l physical (1) | L.J. Stow Ranch (1) |
| La Jolla formation (1) | La Nina (1) | labor (1) |
| Labor Day Fires (1) | labor relations (1) | Lagoon Creek (1) |
| Lagoon Pond (1) | Lake Creek (18) | Lake Creek (North Umpqua River) (1) |
| Lake Creek (North Umpqua) (1) | Lake Creek (Siuslaw (1) | Lake Creek (Siuslaw River) (1) |
| Lake Creek (Siuslaw) (9) | Lake in the Woods (1) | Lakes (2) |
| Lally Creek (1) | Laminaria saccharina (1) | Lampreys = Lampetra spp (1) |
| Lamprophyres (1) | Land bridge (2) | land ownership (139) |
| land use (220) | land use planning (20) | landfills (3) |
| landslides (183) | landsllides (1) | Lane County (Or.) (1) |
| Lane Creek (2) | Langlois Beach (1) | Lapilli (2) |
| large woody debris (16) | Largescale sucker = Catostomus macrocheilus (1) | largescale sucker=Catostomus macrocheilus (3) |
| Larson Creek (2) | larvae (6) | Lava (38) |
| Lava flows (23) | Lavadoure Creek (1) | Lavas (39) |
| law (2) | Leaburg Fish Hatchery (1) | lead (17) |
| Least sandpiper = Calidris minutilla (1) | Leatherwood (1) | Lee Creek (2) |
| leeches (4) | Leeds Island (1) | Lemolo 1 (1) |
| Lemolo 2 (1) | Lemolo Dam (1) | Lemolo Lake (11) |
| Lemolo Reservoir (9) | Leopard shark = Triakis semifasciata (3) | Lepeophtheirus hospitalis (1) |
| Leptocheirus plumulosus (2) | Leptochelia dubia (2) | Leptochella dubia (1) |
| Lesser scaup = Aythya affinis (1) | Lesson plan (1) | Letitia Creek (1) |
| Leuciscus balteatus (3) | Lewis and Clark River, Alsea Bay, Lower Alsea River, diatoms, new species description, taxonomy, salinity, wetland vegetation, geographical distribution, paleosciences, fossils (1) | Lewis Creek (2) |
| Libya (1) | lichens (1) | Lick Creek (1) |
| Lidar (1) | Life histories (1) | life history (10) |
| life history information (360) | life history intormation (1) | light (23) |
| light data (5) | lighthouses (3) | Lily Lake (2) |
| Lily Lake (Siuslaw) (1) | Limestones (11) | limnology (2) |
| Limpy Creek (3) | Limpy Rock Research Natural Area (1) | Lincoln Beach (4) |
| Lincoln City (2) | Lincoln City (Or.) (30) | Lincoln City (Or.), Newport (Or.), Waldport (Or.), Yachats (Or.) (1) |
| Lincoln City Littoral Cell (2) | Lincoln City, Or. (1) | Lincoln County (38) |
| Lincoln County (Or.) (18) | Lincoln County (Or.), Cascade Head, Siletz Bay, Lincoln City (Or.), Cape Foulweather, Otter Crest, Beverly Beach, Yaquina Head, Agate Beach, Nye Beach, Newport (Or.), Yaquina Bay, Beaver Creek, Waldport (Or.), Alsea Bay, Bayshore Spit, Yachats (Or.), Ca (1) | Lincoln County, Depoe Bay (Or.), Lincoln City (Or.), Newport (Or.), Siletz (Or.), Toledo (Or.), Waldport (Or.), Yachats (Or.), demographics, population count, mathematical modeling (1) |
| Lincoln Creek Formation (2) | Lincoln Formation (1) | lindane (1) |
| Lingcod = Ophiodon elongates (3) | Lingcod = Ophiodon elongatus (3) | lingcod=Ophiodon elongatus (4) |
| Lint Creek (3) | Lint Slough (18) | Lint Slough Reservoir (Alsea River) (1) |
| lipids (1) | Listonella anguillarum (2) | literature (1) |
| Lithodlyphus virens (1) | Lithogenesis (1) | litigation (1) |
| Little Boulder Creek (1) | Little Camp Creek (1) | Little Canyon Creek (1) |
| Little Creek (2) | Little Dads Creek (1) | Little Elk Creek (6) |
| Little Elk Creek (Yaquina) (1) | Little Elk River (1) | Little Euchre Creek (1) |
| Little Falls (1) | Little Franklin Creek (1) | Little Lake (1) |
| Little Lick (1) | Little Lobster Creek (5) | Little Lobster Creek (Alsea) (11) |
| Little Mill Creek (3) | Little Nestucca Flat (5) | Little Nestucca Rive (1) |
| Little Nestucca River (25) | Little North Fork (2) | Little North Santiam River (1) |
| Little Peak Creek (1) | Little River (22) | Little Rock Creek (13) |
| Little Salmon River (4) | Little Sheep Creek (1) | Little South Fork Smith River (5) |
| Little Taft Creek (1) | Little Wolf Creek (7) | Little Yaquina River (4) |
| littleneck clam = Leukoma staminea (5) | Littleneck clam = Leukoma staminea (113) | Littleneck clam = Leukoma staminea (Paphya staminea) (6) |
| littleneck clam = Protothaca staminea (3) | littleneck clam = Protothaca staminea] softshell clam = Mya arenaria (1) | littleneck clam=Leukoma staminea (12) |
| Littoral (2) | Littorina subrotundata (1) | Live Oak Creek (2) |
| Loafer Creek (1) | Lobster Creek (49) | Lobster Creek (5 Rivers) (1) |
| Lobster Creek (Alsea) (7) | Lobster Creek (tributary of the Rogue River) (1) | Lobster Valley (1) |
| Lobsterr Creek (1) | Lockatong formation (2) | Logan Riffle (1) |
| logging (282) | Logsden (Or.) (7) | Loma Formation (1) |
| Lonewoman Creek (5) | Long Beach (Wa.) (3) | Long Beach (Wa.), San Francisco Littoral Cell, Netarts Littoral Cell, Bathymetry, Coastal hazards, Erosion, Sea level, Topography, Wave height, Weather (1) |
| Long Prairie Creek (1) | Long Tom Creek (1) | Long Tom Creek (Siletz) (1) |
| Long Tom River (1) | Long Wiley Creek (1) | Long-billed curlew = Numenius americanus (1) |
| Long-tailed vole = Microtus longicaudus (1) | Longfin smelt = Sprinchus thaleichthys (1) | Longfin smelt=Sprinchus thaleichthys (1) |
| Longnose dace = Rhinichthys cataractae (1) | longnose dace=Rhinicthys cataractae (3) | looding (1) |
| Lookingglass Creek (17) | Lookingglass Formation (1) | Lookingglass/Winston/Dillard (1) |
| Loon Lake (6) | Loon Lake, Lake Creek, Mill Creek, Umpqua River, human impacts, sediments, geology, paleontology, paleosciences, coastal hazards, earthquakes, floods, landslides, terrestrial vegetation, logging (1) | Loon Lake, Lake Creek, Mill Creek, Umpqua River, sediments, geology, paleontology, paleosciences, earthquakes, floods, landslides, terrestrial vegetation, logging (1) |
| Lost Creek (3) | Lost Creek Beach (1) | Lost Creek State Park (2) |
| Lost Prairie (1) | Lough Terrace (1) | Louie Feller Riffle (1) |
| Louie-Baxter Creek (2) | Louis Creek (2) | Louisiana (1) |
| Low-temperature deformation (1) | Lower Alsea River (4) | Lower Coquille River (1) |
| Lower Cow Creek (5) | Lower Drift Creek (3) | Lower Lobster Creek (6) |
| Lower North Fork Nehalem River (2) | Lower North Fork Siletz River (1) | Lower North Umpqua River (3) |
| Lower Northbay Creek (1) | Lower Siletz River (4) | Lower Siuslaw River (1) |
| Lower Smith River (1) | Lower South Umpqua River (2) | Lower Takelma Indians (1) |
| Lower Umpqua (1) | Lower Umpqua Indians (1) | Lower Umpqua River (82) |
| Lower Umpqua River Basin (1) | Lower Yaquina River (48) | Lower Youghiogheny River (Penn.) (1) |
| Luck Creek (2) | Luckiamute River (4) | Luckiamute River Basin (1) |
| Luder Creek (1) | Lunar (2) | Lusardi Formation (1) |
| Lutsinger Creek (1) | Lyndon Creek (4) | Lyngbye’s sedge = Carex lyngbyei (5) |
| Lyre Formation (7) | | |
