DEL NORTE COUNTY Lava Redwood NP Marble Beds NM Mountain MODOC SISKIYOU Wilderness COUNTY COUNTY South Warner Wilderness TRINITY SHASTA COUNTY COUNTY HUMBOLDT Thousand Lakes LASSEN COUNTY Wilderness COUNTY Lassen Yolla Volcanic NP Caribou Wilderness Bolly-Middle Eel Wilderness TEHAMA COUNTY PLUMAS CC AA LL II FF OO RR NN II AA COUNTY MENDOCINO GLENN BUTTE COUNTY COUNTY COUNTY SIERRA COUNTY COLUSA NEVADA COUNTY YUBA LAKE COUNTY COUNTY PLACER SUTTER COUNTY Desolation COUNTY Wilderness SONOMA COUNTY YOLO EL DORADO Mokelumne NAPA COUNTY COUNTY SACRAMENTO Wilderness COUNTY ALPINE COUNTY AMADOR COUNTY SOLANO COUNTY Emigrant Point Reyes NS MARIN COUNTY CALAVERAS Wilderness COUNTY CONTRA COUNTY Hoover SAN Wilderness SAN COSTA JOAQUIN FRANCISCO COUNTY TUOLUMNE COUNTY MONO COUNTY COUNTY ALAMEDA Yosemite NP COUNTY COUNTY STANISLAUS Ansel Adams SAN MATEO MARIPOSA COUNTY Wilderness COUNTY SANTA COUNTY CLARA COUNTY MERCED Kaiser John Muir SANTA COUNTY Wilderness CRUZ Wilderness COUNTY MADERA FRESNO COUNTY SAN COUNTY BENITO Kings Canyon NP COUNTY Pinnacles NM Sequoia NP INYO Ventana Wilderness COUNTY MONTEREY TULARE COUNTY COUNTY KINGS COUNTY Domeland Wilderness SAN LUIS OBISPO COUNTY KERN COUNTY San Rafael Wilderness SANTA SAN BARBARA BERNARDINO COUNTY COUNTY VENTURA LOS ANGELES COUNTY COUNTY Cucamonga San Gabriel Wilderness µ Wilderness Joshua Tree NP 0 25 50 100 Miles San Gorgonio Wilderness ORANGE San Jacinto COUNTY Wilderness RIVERSIDE CALIFORNIA CLASS I AREAS COUNTY National Park Service Class 1 Areas Agua Tibia Wilderness US Forest Service Class 1 Areas SAN DIEGO IMPERIAL COUNTY COUNTY Sources: Title 40 CFR Part 81, §405 (2011), ESRI (2006), TANA (2006). AIR1100040_4 16 May 2011.