| BIOREGION | | RIVER BASIN |
| | | |
| BAY AREA/DELTA | | BODEGA BAY |
| | | COYOTE |
| | | GUALALA-SALMON |
| | | LOWER CALAVERAS-MORMON SLOUGH |
| | | LOWER COSUMNES-LOWER MOKELUMNE |
| | | LOWER SACRAMENTO |
| | | MIDDLE SAN JOAQUIN-LOWER MERCED-LOWER STANISLAUS |
| | | PAJARO |
| | | PANOCHE-SAN LUIS RESERVOIR |
| | | RUSSIAN |
| | | SAN FRANCISCO BAY |
| | | SAN FRANCISCO COASTAL SOUTH |
| | | SAN JOAQUIN DELTA |
| | | SAN LORENZO-SOQUEL |
| | | SAN PABLO BAY |
| | | SUISUN BAY |
| | | TOMALES-DRAKE BAYS |
| | | UPPER PUTAH |
| | | |
| COLORADO DESERT | | COTTONWOOD TIJUANA |
| | | HAVASU-MOHAVE LAKES-AZ,CA,NV |
| | | IMPERIAL RESERVOIR-AZ,CA |
| | | LOWER COLORADO-AZ,CA |
| | | SALTON SEA |
| | | SAN LUIS REY-ESCONDIDO |
| | | SOUTHERN MOJAVE |
| | | |
| MODOC | | BUTTE-CA,OR |
| | | EAST BRANCH NORTH FORK FEATHER |
| | | GOOSE LAKE-CA,OR |
| | | HONEY-EAGLE LAKES-CA,NV |
| | | LOST-CA,OR |
| | | LOWER BUTTE |
| | | LOWER PIT |
| | | MADELINE PLAINS-CA,NV |
| | | MASSACRE LAKE-CA,NV |
| | | MILL-BIG CHICO |
| | | NORTH FORK FEATHER |
| | | SACRAMENTO-LOWER COW-LOWER CLEAR |
| | | SACRAMENTO-LOWER THOMES |
| | | SMOKE CREEK DESERT-CA,NV |
| | | SURPRISE VALLEY-CA,NV |
| | | UPPER BUTTE |
| | | UPPER COW-BATTLE |
| MODOC (CON'T.) | | UPPER PIT |
| | | WARNER LAKES-CA,NV,OR |
| | | |
| MOJAVE | | ANTELOPE-FREMONT VALLEYS |
| | | COYOTE-CUDDEBACK LAKES |
| | | DEATH VALLEY-LOWER AMARGOSA-CA,NV |
| | | EUREKA-SALINE VALLEYS-CA,NV |
| | | FISH LAKE-SODA SPRING VALLEYS-CA,NV |
| | | HAVASU-MOHAVE LAKES-AZ,CA,NV |
| | | IMPERIAL RESERVOIR-AZ,CA |
| | | INDIAN WELLS-SEARLES VALLEYS |
| | | IVANPAH-PAHRUMP VALLEYS-CA,NV |
| | | MIDDLE KERN-UPPER TEHACHAPI-GRAPEVINE |
| | | MOJAVE |
| | | OWENS LAKE |
| | | PANAMINT VALLEY |
| | | PIUTE WASH-CA,NV |
| | | SALTON SEA |
| | | SANTA CLARA |
| | | SOUTHERN MOJAVE |
| | | SOUTH FORK KERN |
| | | UPPER AMARGOSA-CA,NV |
| | | |
| NORTH COAST/KLAMATH | | APPLEGATE-CA,OR |
| | | BIG-NAVARRO-GARCIA |
| | | BUTTE-CA,OR |
| | | CHETCO-CA,OR |
| | | COTTONWOOD HEADWATERS |
| | | GUALALA-SALMON |
| | | ILLINOIS-CA,OR |
| | | LOST-CA,OR |
| | | LOWER CACHE |
| | | LOWER COTTONWOOD |
| | | LOWER EEL |
| | | LOWER KLAMATH-CA,OR |
| | | LOWER PIT |
| | | MAD-REDWOOD |
| | | MATTOLE |
| | | MCCLOUD |
| | | MIDDLE FORK EEL |
| | | RUSSIAN |
| | | SACRAMENTO-LOWER COW-LOWER CLEAR |
| | | SACRAMENTO-LOWER THOMES |
| | | SACRAMENTO-STONE CORRAL |
| NORTH COAST/KLAMATH (CON'T.) | | SACRAMENTO-UPPER CLEAR |
| | | SACRAMENTO HEADWATERS |
| | | SALMON |
| | | SCOTT |
| | | SHASTA |
| | | SMITH-CA,OR |
| | | SOUTH FORK EEL |
| | | SOUTH FORK TRINITY |
| | | TRINITY |
| | | UPPER CACHE |
| | | UPPER COW-BATTLE |
| | | UPPER EEL |
| | | UPPER ELDER-UPPER THOMES |
| | | UPPER KLAMATH-CA,OR |
| | | UPPER PUTAH |
| | | UPPER STONY |
| | | |
| SACRAMENTO VALLEY | | HONCUT HEADWATERS |
| | | LOWER AMERICAN |
| | | LOWER BEAR |
| | | LOWER BUTTE |
| | | LOWER CACHE |
| | | LOWER COSUMNES-LOWER MOKELUMNE |
| | | LOWER COTTONWOOD |
| | | LOWER FEATHER |
| | | LOWER SACRAMENTO |
| | | LOWER YUBA |
| | | MILL-BIG CHICO |
| | | NORTH FORK FEATHER |
| | | SACRAMENTO-LOWER COW-LOWER CLEAR |
| | | SACRAMENTO-LOWER THOMES |
| | | SACRAMENTO-STONE CORRAL |
| | | SACRAMENTO HEADWATERS |
| | | SOUTH FORK AMERCAN |
| | | UPPER BEAR |
| | | UPPER BUTTE |
| | | UPPER COON-UPPER AUBURN |
| | | UPPER COSUMNES |
| | | UPPER COW-BATTLE |
| | | UPPER STONY |
| | | UPPER YUBA |
| | | |
| SAN JOAQUIN VALLEY | | CARRIZO PLAIN |
| | | CUYAMA |
| SAN JOAQUIN VALLEY (CON'T.) | | ESTRELLA |
| | | LOWER CALAVERAS-MORMON SLOUGH |
| | | MIDDLE KERN-UPPER TEHACHAPI-GRAPEVINE |
| | | MIDDLE SAN JOAQUIN-LOWER CHOWCHILLA |
| | | MIDDLE SAN JOAQUIN-LOWER MERCED-LOWER STANISLAUS |
| | | PANOCHE-SAN LUIS RESERVOIR |
| | | TULARE-BUENA VISTA LAKES |
| | | UPPER CHOWCHILLA-UPPER FRESNO |
| | | UPPER DEER-UPPER WHITE |
| | | UPPER DRY |
| | | UPPER KAWEAH |
| | | UPPER LOS GATOS-AVENAL |
| | | UPPER MERCED |
| | | UPPER TULE |
| | | UPPER TUOLUMNE |
| | | |
| SIERRA | | ANTELOPE-FREMONT VALLEYS |
| | | CROWLEY LAKE-CA,NV |
| | | EAST BRANCH NORTH FORK FEATHER |
| | | EAST WALKER-CA,NV |
| | | EUREKA-SALINE VALLEYS-CA,NV |
| | | FISH LAKE-SODA SPRING VALLEYS-CA,NV |
| | | HONCUT HEADWATERS |
| | | HONEY-EAGLE LAKES-CA,NV |
| | | INDIAN WELLS-SEARLES VALLEYS |
| | | LAKE TAHOE-CA,NV |
| | | LOWER AMERICAN |
| | | LOWER CALAVERAS-MORMON SLOUGH |
| | | LOWER COSUMNES-LOWER MOKELUMNE |
| | | MIDDLE FORK FEATHER |
| | | MIDDLE KERN-UPPER TEHACHAPI-GRAPEVINE |
| | | MIDDLE SAN JOAQUIN-LOWER CHOWCHILLA |
| | | MIDDLE SAN JOAQUIN-LOWER MERCED-LOWER STANISLAUS |
| | | MILL |
| | | MONO LAKE-CA,NV |
| | | NORTH FORK AMERICAN |
| | | NORTH FORK FEATHER |
| | | OWENS LAKE |
| | | SOUTH FORK AMERCAN |
| | | SOUTH FORK KERN |
| | | TRUCKEE-CA,NV |
| | | TULARE-BUENA VISTA LAKES |
| | | UPPER BEAR |
| | | UPPER BUTTE |
| SIERRA (CON'T.) | | UPPER CALAVERAS |
| | | UPPER CARSON-CA,NV |
| | | UPPER CHOWCHILLA-UPPER FRESNO |
| | | UPPER COON-UPPER AUBURN |
| | | UPPER COSUMNES |
| | | UPPER DEER-UPPER WHITE |
| | | UPPER DRY |
| | | UPPER KAWEAH |
| | | UPPER KERN |
| | | UPPER KING |
| | | UPPER MERCED |
| | | UPPER MOKELUMNE |
| | | UPPER POSO |
| | | UPPER SAN JOAQUIN |
| | | UPPER STANISLAUS |
| | | UPPER TULE |
| | | UPPER TUOLUMNE |
| | | UPPER YUBA |
| | | WEST WALKER-CA,NV |
| | | |
| SOUTH CENTRAL COAST | | ALISAL-ELKHORN SLOUGHS |
| | | CARMEL |
| | | CENTRAL COASTAL |
| | | CUYAMA |
| | | ESTRELLA |
| | | MIDDLE KERN-UPPER TEHACHAPI-GRAPEVINE |
| | | MIDDLE SAN JOAQUIN-LOWER CHOWCHILLA |
| | | MIDDLE SAN JOAQUIN-LOWER MERCED-LOWER STANISLAUS |
| | | PAJARO |
| | | PANOCHE-SAN LUIS RESERVOIR |
| | | SALINAS |
| | | SANTA BARBARA COASTAL |
| | | SANTA CLARA |
| | | SANTA MARIA |
| | | SANTA YNEZ |
| | | SAN ANTONIO |
| | | SAN FRANCISCO COASTAL SOUTH |
| | | SAN LORENZO-SOQUEL |
| | | TULARE-BUENA VISTA LAKES |
| | | UPPER LOS GATOS-AVENAL |
| | | VENTURA |
| | | |
| SOUTH COAST | | ALISO-SAN ONOFRE |
| | | ANTELOPE-FREMONT VALLEYS |
| SOUTH COAST (CON'T.) | | CALLEGUAS |
| | | COTTONWOOD TIJUANA |
| | | LOS ANGELES |
| | | MOJAVE |
| | | NEWPORT BAY |
| | | SALTON SEA |
| | | SANTA ANA |
| | | SANTA BARBARA COASTAL |
| | | SANTA CLARA |
| | | SANTA MARGARITA |
| | | SANTA MONICA BAY |
| | | SAN DIEGO |
| | | SAN GABRIEL |
| | | SAN JACINTO |
| | | SAN LUIS REY-ESCONDIDO |
| | | SEAL BEACH |
| | | SOUTHERN MOJAVE |
| | | VENTURA |