Designated High Altitude Counties* Requiring High Altitude Emission Control

EPA DESIGNATED HIGH ALTITUDE COUNTIES (SHADED AREA INDICATES HIGH ALTITUDE):

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
Dear 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 Torrence
Luna Union
McKinley Valencia


STATE OREGON

Lake

STATE OF UTAH
Beaver
Pluto
Box Elder Rich
Cache
Salt Lake
Carbon
San Juan
Daggett Sanpet
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 Unita
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