Apr. 15,1925 Use of Liability Ratings in Forest Fire Protection 749 
Table XIII .—Average number of general risk fires per year , per million aeres, by 
10-day periods —Continued 
REGION 12—EASTERN COLORADO 
Number of fires, by forest types 
Period 
Western 
yellow pine 
Douglas fir 
Lodgepole 
pine 
Engel- 
mann 
spruce 
Subalpine 
Grass and 
brush 
Mar. 21-31.__ 
no 
Apr. 1-10____. 
11-90 
0.2 
i 
] U» J7 
21-30—_ _ 
i - 
May 1-10___ 
.2 
0.4 
I • 
11-20_____ . 
r --i—-.7-;—- 
21-31_ 
1.2 
3.1 
! 
j' ' ■ 5 
June 1-10_ 
. 7 
.4 
I 
4.0 
A A 
11-20___ 
5 
3.1 
A 
i o 
21-30,_ _ 
! 9 
1. 3 
1.8 
. 9 
• 2 
4. u 
4.0 
Q A 
.9 
2.6 
July 1-10_ 
2.3 
.9 
9.2 
1 ’ ' 2 
11-20___ 
o. il 
.9 
21-31... 
. 7 
3.1 
.4 
5 
1 
Aug. 1-10__ 
1. 6 
3.1 
.9 
a 
11-20-.-.,._ 
.7 
. • v 
21-31......_ 
. 7 
6.1 
4 
4.0 
Sept. 1-10____ . . 
• .7 
3.1 
1.3 
_ 
11-20... 
.5 
4 
.9 
21-30—.. _ 
.2 
.4 
Oct. 1-10___ 
.9 
3.1 
ft 
11-20-_ 
.5 
3.1 
21-31__ . . 
.4 
2 
Nov. 1-10_ 
2 
-.9 
11-20—_ 
. 7 
.4 
2 
21-30._ 
Danger periods A b ... _ 
May 21-31; 
July 1- 
10; Aug. 
1-10. 
None. 
May 21-31; 
June 11- 
20; July 
1-10; Ju- 
1 y 2 1- 
Aug. 10; 
Aug. 21- 
Sept. 10; 
Oct. 1- 
20. 
Same as A. 
Juneil- 
July 10; 
Sept. 1- 
10. 
None. 
None. 
None. 
June 1- 
July 10; 
Aug 21- 
31. 
Same as A. 
Danger periods B 6 _____ 
Juu6 ^1“ 
30. 
None. 
".Danger periods A are the periods during which one or more than one fire occurs in 10 days. Danger 
periods B are the periods within which three or more fires occur in 10 days, or two fires or more a week. 
