|
| H-15 Watersheds (1) | H. J. Andrews Experimental Forest (2) | H.J. Andrews Experimental Forest (1) |
| habit restoration (1) | habitat (26) | habitat conservation (64) |
| habitat resotration (1) | habitat restoration (137) | habitats (296) |
| habitats, (1) | Hakki Creek (1) | Half Moon Weir (3) |
| Halfway Creek (5) | Halfway Creek (Smith River) (1) | Haliclona spp. (1) |
| Hall Lake (5) | Halolaelaps hatfieldi (1) | Hamer Lake (Yaquina River) (1) |
| Hammond (Or.) (1) | Handy Cree (1) | Hanson's Marina (5) |
| Happy Camp (13) | Happy Camp (Oregon) (1) | harbor (34) |
| harbor porpoise=Phocoena phocoena (1) | Harbor seal = Phoca vitulina (33) | Harbor seal = Phoca vituline, Steller sea lion = Eumetopias jubata, California sea lion = Zalophus californianus, Pacific salmonids = Oncorhynchus spp., (1) |
| harbor seal=Phoca vitulina (3) | harbors (59) | hardhead=Mylophardon conocephalus (3) |
| Hardscrabble Creek (1) | Harlan (2) | Harlequin duck = Histrionicus histrionicus (1) |
| harlequin duck=Histrionicus histrionicus (2) | harmful algae blooms (2) | harmful algal blooms (2) |
| Harrington Creek (1) | Harris mud crab = Rhithropanopeus harrisii (3) | Harrison Young Brook (1) |
| Hart Creek (1) | Hart's Rapid (1) | Harvey Creek (5) |
| Hatcherie (1) | hatcheries (246) | hatcheries: Rock Creek Fish Hatchery (1) |
| hatcheries: Siletz Fish Hatchery (1) | hatcheries” (2) | hatchery salmonids (326) |
| hatchery salmonids. (1) | Hatchet Creek (2) | Hatfield Marine Science Center (66) |
| Hawaii (36) | Haxel Creek (1) | Hayden Creek (3) |
| Hayes Creek (9) | Haymond Formation (1) | Haystack Rock (1) |
| hazardous waste (4) | health (1) | Heath Creek (1) |
| heavy metals (21) | heavy minerals (13) | Heceta Head (9) |
| Heddin Creek (1) | Hediste diadroma (1) | Hediste limnicola (1) |
| Hediste limnicola (Nereis limnicola) (1) | Heermann's gull = Larus heermanni (1) | Heermann's gull=Larus heermanni (3) |
| Helms Creek (1) | Hemlock Creek (2) | hemoflagellates (1) |
| Henderson Cove (1) | Henderson Creek (2) | Henry Creek (1) |
| Herb Creek (2) | herbicides (11) | Herman Creek (1) |
| hermit crab=Pagurus species (1) | herpetology (1) | Herren Formation (1) |
| herring gull=Larus argentatus (1) | Hestness Park (1) | Hidden Marsh (2) |
| Hidden Marsh (South Slough) (1) | High Cascades Complex fires (1) | high cockscomb=Anoplarchus purpurescens (2) |
| High Rock Creek (1) | Highway 101 Bridge (1) | Hill Creek (1) |
| Hinkle Creek (16) | Hinkle Creek Paired Watersheds Study (1) | Hinkle Creek Study (7) |
| Hinsdale Ranch (1) | Hinsdales Ranch (1) | Hinton Point (8) |
| Hipower Creek (2) | histology (2) | historic (1) |
| historical (282) | history (97) | historyical (1) |
| Hodgdon Cr. (1) | Hodgdon Creek (1) | Hog Creek (1) |
| Hokkaido Island (1) | Hole-in-the-Ground (1) | Holman Creek (1) |
| Holocene (36) | homing (1) | Honey Creek (1) |
| Honey Grove Creek (1) | Honeygrove Creek (2) | Honeysuckle Creek (1) |
| Hood River (2) | Hoquarton Slough (3) | Hornbrook Formation (3) |
| horned grebe=Podiceps auritus (2) | Horner Creek (2) | Horner Ranch (2) |
| Horse Barn mitigation site (2) | horse barnacle = Semibalanus cariosus (1) | Horse clam = Tresus capax (1) |
| Horse Creek (9) | Horse Heaven Creek (4) | Horseheaven Creek (2) |
| Horseshoe Bend (3) | Horsetown formation (1) | Hough Creek (1) |
| Hough Creek (Siletz) (3) | Hound Creek (1) | House Creek (1) |
| Hoxie Simmons [Riffle] (1) | Hubbard (1) | Hubbard Creek (4) |
| HUC 17100301 (1) | HUC 17100302 (4) | HUC# 1710030111 (2) |
| Hudson Slough (3) | Hudsonian curlew = Numenius phaeopus hudsonicus (1) | Hudson’s Bay Company (1) |
| human activities (1) | human impact (7) | human impacts (522) |
| human impacts, logging, North Umpqua River, Pass Creek, Steelhead trout = Oncorhynchus mykiss, Steamboat Creek (1) | human use and impacts (28) | Humboldt Bay (7) |
| Humboldt Bay (Ca.) (1) | Humboldt Bay (Cal.) (1) | Humboldt Bay (Calif.) (1) |
| Humbug Creek (2) | Humbug Mountain (2) | humidity data (1) |
| Humpback whale = Megaptera novaeangliae (1) | Humphry Creek (1) | Humptulips Formation (1) |
| Hunt Cove (1) | Hunter Creek (4) | Hunters Creek (3) |
| Huntley Creek (2) | Hurd Creek (1) | Hyalella species (1) |
| hybridization (7) | Hydrocarbon (9) | hydrocarbons (106) |
| hydrogen (1) | hydrogen sulfide (3) | hydrography (106) |
| Hydrography, streamflow, flooding, Netarts Bay, Salmon River, Siletz River, Depoe Bay, Yaquina River, Alsea River, Beaver Creek, Yachats River, Siuslaw River, Umpqua River (1) | hydroids (2) | hydrology (517) |
| hydropower (1) | hydroxylamine (1) | hypoxia (3) |
