USDA Forest Service Class 1 Federal Areas - 1997 Study - West

Ansel Adams Wilderness Area	Cabinet Mountains Wilderness Area	Dome Land Wilderness Area
Flat Tops Wilderness Area	Galiuro Wilderness Area	Gates of the Mtn Wilderness Area
Glacier Peak Wilderness Area	Goat Rocks Wilderness Area	John Muir Wilderness Area
Kaiser Wilderness Area	Mission Mountain Wilderness Area	Mokelumme Wilderness Area
Mount Zirkel Wilderness Area	Mountain Lakes Wilderness Area	Pine Mountain Wilderness Area
Rawah Wilderness Area	San Rafael Wilderness Area	Sycamore Canyon Wilderness Area
Ventana Wilderness Area	Wheeler Peak Wilderness Area	White Mountain Wilderness Area

Light Pollution Impact - Slight

Bob Marshall Wilderness Area	Bridger Wilderness Area	Caribou Wilderness Area
Chiricahua Wilderness Area	Diamond Peak Wilderness Area	Eagle Cap Wilderness Area
Emigrant Wilderness Area	Fitzpatrick Wilderness Area	Gearhart Mountain Wilderness Area
Gila Wilderness Area	Hells Canyon Wilderness Area	Hoover Wilderness Area
Jarbidge Wilderness Area	Kalmiopsis Wilderness Area	La Garita Wilderness Area
Marble Mountain Wilderness Area	Mount Adams Wilderness Area	Mount Baldy Wilderness Area
Mount Jefferson Wilderness Area	Mount Washington Wilderness Area	North Absaroka Wilderness Area
Pasayten Wilderness Area	San Pedro Parks Wilderness Area	Sawtooth Wilderness Area
Scapegoat Wilderness Area	Selway-Bitterroot Wilderness Area	Sierra Ancha Wilderness Area
South Warner Wilderness Area	Strawberry Mountain Wilderness Area
Teton Wilderness Area	Thousand Lakes Wilderness Area	Three Sisters Wilderness Area
Washakie Wilderness Area	Weminuche Wilderness Area	West Elk Wilderness Area
Yolla-Bolly-Middle-Eel Wilderness Area

As a rough estimate - around Green you loose approximately half of the visible stars and around Orange you loose three-fourths. - Robert Wagner

Key and US Forecasted Growth
These images were produced using the North American Night Sky Brightness Overlay and Google Earth.
The list of 156 Mandatory Class 1 Federal Areas is available at the EPA Website.
A map of Federal Class 1 Areas is available at the NPS Website.
This site is maintained by Robert Wagner - of Kansas City, MO. Please contact me if you have any additional relevant information or corrections.