GAZETTEER OF COLORADO. 141 
Alias sheet. 
Rio Blanco; county in the northwestern part of the State; 
hounded on the north by Routt County, on the east by 
Routt and Garfield counties, on the south by Garfield 
County, and on the west by Utah. Its surface consists 
mostly of plateaus, sloping toward the valley of White 
River, which centrally traverses the county from east to 
west. Its area is 3,249 square miles, of which 1 per cent, 
or 21,846 acres, were under cultivation in 1900. The popu- 
lation in 19C0 was 1,690; and of Meeker, the county seat, 
507. In 1900 the average magnetic declination was for 
the eastern part, 14° 20' east, and for the western part, 
15° 00 r east. The mean annual rainfall is about 16 inches, 
and the mean annual temperature 40° to 45°. 
Rio Blanco; river in Archuleta County, a left-hand branch of 
San Juan River. 
|Rio Blanco; post village in Rio Blanco County. 
Rio Chama; river in Conejos County, a left-hand branch of 
Rio Grande. 
Rio Conejos; river in Conejos County, a right-hand branch of 
Rio Grande. 
Rio Culebra; river in Costilla County, a left-hand branch of 
Rio Grande. 
Rio del Codo; river in San Miguel County, a right-hand 
branch of San Miguel River. 
Elio de los Pifios; river in La Plata County, a right-hand 
branch of San Juan River. 
ctio Dolores Chiquita; river in Mesa County, a right-hand 
branch of Dolores River. 
Elio Doming-uez; river in Mesa County, a left-hand branch 
of Uncompahgre River. 
iio Escalante; river in Montrose County, a left-hand branch 
of Gunnison River. 
&io Grande; county in the southern part of the State; bounded 
on the north by Saguache County, on the east by Saguache, 
Costilla, and Conejos counties, on the south by Conejos 
County, and on the west by Mineral county. It includes 
part of San Luis Valley, and extends on the west into San 
Juan Mountains. Its area is 1,331 square miles, of which 
9 per cent, or 78,141 acres, were under cultivation in 1900. 
The population in 1900 was 4,080; and of Del Norte, the 
county seat, 705. In 1900 the average magnetic declina- 
tion was 13° 00' east. The mean annual rainfall is about 
7 inches, and the mean annual temperature 40°. 
ao Grande; one of the large rivers of the United States. It 
heads in San Juan Mountains, near Bakers Park, flows east 
to the San Luis Valley, then turns south, traversing the 
entire Territory of New Mexico to El Paso, Tex., beyond 
which point it forms the boundary between the United 
States and Mexico. Discharge at Del Norte, April 1 to Octo- 
Iber 31, 1904, 345,900 acre-feet. 
