Table 1. Comparative Water Conditions on Aerial Transects ~ 1957, 1958 and 1959 - Montana 
Reservoirs Potholes | Other Total 
Physiographic Per Square Mile Per Square Mile Per Square Mile Per Square Mile Percent chenge 
Area 1957 1958 1959 1957 1958 1959 1957 1958 1959 1957 1958 1959 from 1955 
Sheridan County 13 «2h 43 2.32 4.19 2.64 56 48 .43° 3.01 4.91 3.50 =29 
Eastern Hi-Line 57 4O .64 .08 .37 1.34 .9h .84 .88 1.60 1.60 1.81 #13 
Central Hi-Line 86 .90 1.10 19 4h 2.21 96 .80 .73 2.01 2.14 4.04 #89 
Great Falls 1.13 1.22 1.22 4h 8676 1.43 1.07 .77 1.04 2.63 2.75 3.69 £34 
Piedmont 


© Table 2. Waterfowl Populations as Determined from Aerial Transects - 1958, 1959 
Physiographic Seka aune Square Miles Sampled | Dus Per Square Mile Population Estimate Percent change 
Area (Square Miles ) 1958 1959 ‘10 Yr. Av. 1958 1959 1958 1959 __ from 1956 __ 
Sheridan County 1,440 38 =: 38 28.7 33.3. 16.3 47,952 23,472 isi 
Eastern Hi-Line 7,926 172. ~=172 4.9 be” 5.0 34, 874 39,630 /14 
Central Hi-Line 9,468 ok 94 - 10.3 | 10.5 | 12.9 99,414 (122,137 #23 
Great Falls 7,020 14300 143 | 8.4 7-4 13.1 51,948 91,962 #TT 
Piedmont aa 7, | . | | 

Tote: | | : 234,188 277,201 £18 
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