RURAL HIGHWAY MILEAGE, INCOME, AND EXPENDITURES 37 
Table 11. — Rural road mileage by types and highway systems as existing January 1, 
1922, and mileage of each type built during 1921 in each State — Continued 
MICHIGAN 
Type 
State trunk lines 
County roads 
Total 
Jan. 1, 
1922 
Built 
1921 
Total 
Jan. 1, 
1922 
Built 
1921 
All rural roads 
Total 
Jan. 1, 
1922 
Built 
1921 
Miles 
Miles 
Unimproved earth 
Partly graded and drained earth. 
Earth to definite grade with permanent 
drainage structures 
Sand-clay 
Gravel... 
Waterbound macadam 
Surface-treated macadam 
Bituminous macadam 
Bituminous concrete 
Portland cement concrete. 
Brick 
Miscellaneous 
101.7 
Total. 
75.0 
2, 624. 
643.3 
291.4 
50.8 
Miles 
34, 591. 
23, 495. 
Miles 
~"~2L5 
78.4 
103. 6l 
429. 4 
6.71 
21.5 
25.2 
24.6 
143.3 
0.4 
77. 
10, 560. 
1, 071. 
120. 
247.1 
77.6 
1, 437. 9 
56.5 
36.8 
10.0 
24.8 
114.4 
1.2 
Miles 
34, 591. 4 
25, 430. 6 
75.0 
77.6 
13, 184. 6 
1,714.9 
236.4 
172.2 
224.1 
1, 293. 9 
13.5 
268.6 
5, 916. 8 
637. 4 71, 366. 1, 780. 7 
282. 8 
Miles 
~"I23."2 
77.6 
1, 729. 3 
107.3 
36.8 
35.2 
49.4 
257.7 
1.6 
2, 418. 1 
MINNESOTA 
State trunk 
lines 
State-aid 
roads 
Countyroads! ™* 
All rural roads 
Type 
Total 
Jan. 1, 
1922 
Built 
1921 
Total 
Jan. 1, 
1922 
Built 
1921 
Total 
Jan. 1, 
1922 
Built 
1921 
J™ 1 ' B^ 
'SbM l921 
J™ 1 ' Built 
J m2 h 1921 
Unimproved earth 
Partly graded and drained 
earth 
Earth to definite grade with 
permanent drainage struc- 
tures... 
Sand-clay. 
Miles 
452.4 
1, 537. 9 
602.9 
290.8 
3, 707. 5 
15.3 
Miles 
262.9 
1.8 
130.5 
Miles 
2, 707. 6 
271.1 
2, 396. 9 
140.1 
2, 655. 4 
74.2 
Miles 
271.1 
1, 037. 
"967.3 
Miles 
4. 399. 1 
3. 157. 2 
160.0 
229.5 
2, 671. 8 
Miles 
135.0 
559.8 

11.5 
229.1 
0.7 
Miles Miles 
16, 884. 3 i 230. 2 
57,054.54,345.9 
575.0 
3, 314. 8, 118. 
3, 153. 2' 222. 4 
55.0 
7.4 
6. 3 3. 
8.0 1.0 
0.8 
49. 1 5. 
Miles Miles 
24, 443. 4 i 265. 2 
62,020.7 5,176.8 
3,734.81,299.9 
3,975.2 131.3 
12,187.9 1 M9 .3 
Waterbound macadam 
Surface-treated macadam 
24.1 
67.4 
168.6 
74.8 
19.5 
9.1 
99.6 
349.9 
10.1 
0.7 
Bituminous macadam 
13.2 
1.1 
48.9 
215.6 
10.1 
3.0 
Sheet asphalt 
1.0 
Bituminous concrete 
Portland cement concrete. .. 
Brick 
3.2 
24.9 
29.2 
72.6 
18.0 
68.0 
20.7 
12.6 
19.1 
6.8 
40.3 
104.7 
Wood block.. 
9.6 
::::::::. 
9.6 
Miscellaneous 

1.0 
1.0 
1 
Total. 
6, 905. 3 
423.318,347.1 
2, 361. 4 
10, 742. 4 
862. 81, 108. 4 4, 926. 5 107, 103. 2J8, 573. 2 
1 New roads laid out but not improved. 
