TABLE D-4.--Number of water area per square mile, Montana, 1959-61 
Sheridan a Great Falls- 
soa Fa 
Reservoirs: 

TABLE D-5.--Number of water areas, by stratum, North Dakota, South Dakota, and western Minnesota, 1958-61 
[Index numbers, in thousands] 
Total 



1958-~-----------~------------~--- 320 119 B45 
1959-----------+-------------+---- 109 69 340 
1960--------------------+-------- 397 a) 695 
1961---------~----~--------------- 105 51 307 
Percent change, 1961 from 1960-- -33 -56 
July: 
1958--------~----~---------+------- 254, 1,017 
1959. ----------~--~-+----=----=+=- 73 396 
1960--------~---------~---------- 116 736 
1961----------------------------- 77 351 
Percent change, 1961 from 1960-- -33 -52 
TABLE D-6. --Water indexes, North Dakota, 
May 1948-61 
Index mumber 



Average, 1948-60---------+- 376,600 
1960-----------------+---- 383 ,'700 
[961 ene ae aoe tee 168, 300 
Percent change, 1961 
from-- 
ower eee Bee eee eee 
78 
