Designated High Altitude Counties* Requiring High Altitude Emission Control

State of Arizona Apache Navajo

State of Colorado
Adams Jefferson
Alamosa Lake
Arapahoe La Plata
Archuleta Larimer
Boulder Las Animas
Chaffee Lincoln
Clear Creek Mesa
Conejos Mineral
Costilla Moffat
Crowley Montezuma
Custer Montrose
Dolores Morgan
Delta Ouray
Denver Park
Douglas Pitkin
Eagle Pueblo
Elbert Rio Blanco
El Paso Rio Grande
Fremont Routt
Garfield Saguache
Gilpin San Juan
Grand San Miguel
Gunnison Summit
Hinsdale Teller
Huerfano Washington
Jackson Weld


State of Idaho

Bannock Custer
Bear Lake Franklin
Bingham Fremont
Blaine Jefferson
Bonneville Madison
Butte Minidoka
Camas Oneida
Caribou Power
Cassia Teton
Clark Valley

State of Montana
Beaverhead Madison
Deer Lodge Meagher
Gallatin Park
Jefferson Silver Bow

State of Nebraska
Banner Sioux
Kimball
State of Nevada
Carson City Humboldt
Douglas Lander
Elko Lyon
Esmeralda Mineral
Eureka Storey
White Pine

State of New Mexico
Bernalillo Mora
Catron Rio Arriba
Colfax Sandoval
Curry San Juan
De Baca San Miguel
Grant Santa Fe
Guadalupe Sierra
Harding Socorro
Lincoln Taos
Los Alamos Torrance
Luna Union
McKinley Valencia


State of Oregon

Lake

State of Utah
Beaver Piute
Box Elder Rich
Cache Salt Lake
Carbon San Juan
Daggett Sampete
Davis Sevier
Duchesne Summit
Emery Tooele
Grand Uintah
Iron Utah
Juab Wasatch
Kane Wayne
Millard Weber
Morgan

State of Wyoming
Albany Matrona
Carbon Niobrara
Converse Park
Fremont Platte
Goshen Sublette
Hot Springs Sweetwater
Johnson Teton
Laramie Uinta
Lincoln Weston

*Counties which have substantially all of their area above 4000 ft. Ref. Federal Register, Vol. 42, No. 76, April 20, 1977, pg. 20464.