ROAD MILEAGE, CENTRAL AND WESTERN STATES. 7 
Of the 134,141.74 miles of surfaced roads, at the close of 1914, in the Central, Pacific, 
and Mountain States, 78,825.34 miles, or 58.77 per cent, were of gravel; 31,882.24 
miles, or 23.77 per cent, macadam; 13,192.02 miles, or 9.84 per cent, sand-clay; 
2,949.64 miles, or 2.20 per cent, bituminous macadam; 1,789.20 miles, or 1.33 per cent, 
concrete; 794.82 miles, or 0.59 per cent, brick; and 4,708.47 miles, or 3.5 per cent, sur- 
faced with other materials. The distribution of types of surfaced roads as of January 1, . 
1915, is shown by States in Table 6. 1 
Table 6. — Distribution of types of surfaced road, 1914- 
Type. 
State. 
Macadam. 
Bitumi- 
nous mac- 
adam. 
Gravel. 
Sand- 
clay. 
Brick. 
Concrete. 
Miscella- 
neous. 
Total. 
11.23 
837.4 
3 
42.5 
1.675.11 
10,291.29 
171.3 
194.3 
1, 021. 19 
120. 25 
1,531.05 
78 
39.21 
2 
13.5 
877.9 
125.7 
3, 563. 59 
574. 25 
168 
7,052.3 
20,264.59 
413 
151.85 
5,230.25 
2, 825. 25 
3,671.5 
514. 25 
21 
193 
184 
955 
15,385.93 
3,060.15 
212 
685. 75 
3,924.48 
9,597 
52.5 
45 
582. 25 
450. 12 
449 
2,467.95 
150. 25 
23 
758.5 
1,375.27 
985. 33 
1,442.25 
14 
1,131.1 
67 
72.5 
58 
a 3, 489. 4 
164.25 
3 
57.7 
253. 43 
""82." 92" 
34.75 
------ 
.5 
1 
929. 19 
2.25 
4.5 
148.8 
53.17 
5.77 
1.35 
107.3 
17.5 
2.77 
10,279.73 
1, 193. 87 
Idaho 
12 
121. 53 
168. 35 
679 
Illinois 
11, 606. 31 
30,962.4 
1.5 
38.75 
614. 57 
Kansas 
1, 148. 85 
94.5 
19 
59 
7, 828. 51 
3,967.83 
5 
3 
2 
6,712.57 
609. 25 
1.3 
2.4 
7.53 
1,204.54 
Nevada 
262 
5 
261.5 
North Dakota 
955 
Ohio 
12,903.87 
1, 000. 72 
1, 066. 29 
137. 25 
10 
15.5 
165. 52 
183 
211 
300 
129 
401 
8-3.50 
2,054 
640.41 
315. 67 
28.41 
46 
199. 87 
12 
30, 569. 17 
4,726.4 
363 
Utah 
49 
502. 82 
1,408 
' *26.'35* 
2.4 
2.5 
79.42 
83.07 
1, 153. 75 
Washington 
140 
72 
416 
4,922.09 
13,399.47 
468.5 
Wyoming 
Total 
31, 882. 24 
23.77 
2,949.64 
2.2 
78, 825. 34 
58.77 
13, 192. 02 
9.84 
794. 82 
.59 
1, 789. 20 
1.33 
4,708.47 
3.5 
134, 141. 74 
Per cent 
100 
a Oiled earth. 
Detailed information regarding sources and amounts of revenues, bonds issued and 
outstanding, total mileage of roads, and mileage surfaced, systems of administration, 
and other factors affecting road improvement, is presented under the respective State 
headings. 
ARIZONA. 2 
Arizona has a land area of 113,810 square miles, a total road mileage of 12,075, 
of which 253.43 miles, or 2.09 per cent, were surfaced at the close of 1914. 
The State engineer is appointed by the governor, by and with the consent of the 
senate. He is required to be a practical and competent civil engineer, and serves 
for a term of two years. His duties are to aid the State board of control and the 
boards of supervisors of the several counties in the selection and designation of State 
highways and bridges, which are defined to be all highways and parts of highways 
and bridges heretofore constructed by the Territory or State of Arizona or that may 
be built hereafter by the State. The boards of supervisors are required to act with 
the State engineer in the selection of the highways and bridges to be constructed 
i The tables referred to hereafter in the text will be found in the appendices: Those referring to road 
mileage are grouped in Appendix A, those referring to revenues expended in Appendix B, and those refer- 
ring to bond issues in Appendix C. 
2 In collecting the information for Arizona assistance was rendered by Lamar Cobb, State engineer, and 
collaborator of the U. S. Department of Agriculture. 
