Table I. - Comparative Numbers of Water Areas Observed Over the Same Routes During the 1953, 1954 
and 1955 Aerial Breeding Ground Survey. 
Reservoirs Potholes — Other Total 
Physiographic Per Sq. Mile Per Sq. Mile Per Sq. Mile . Per Sq. Mile % Change 
Area 1953 1954 1955 1953 1954 1955 1953 1954 1955 1953 1954 1955 1954 to 1955 
Eastern Hi-line LO Lege Ego -71 1.05 1.41 .81 .68 .51 1.71 2.03 2.25 + 11 
Central Hi-line .64 .55 .76 1.45 3,18 3.75 .42 .48 .96 2.50 4.21 5.48 + 30 
Great Falls Piedmont.66 .81 .84 2.05 .94 1.69 .34 .38 .49 3.04 2.12 3.02 + 42 
(5 Strips) 
Table II. - Waterfowl Populations as Determined From Aerial Census Routes. 
Approximate No. of Sq. Mi. 
Physiographic Size of Area Sampled No. of Ducks/Sq. Mile Pop. Estimates 
Area (Square Mi.) 1954 1955 6 Yr. Avg. 1954 1955 1954 1955 
Sheridan County 1,440 33 33 27.4 48.2 39.3 69,408 56,592 
Eastern Hi-line 7,920 171 171 5.1 6.7 6.4 53,064 50,688 
Central Hi-line 9,468 101 101 10.9 16.7 15.0 158,115 142,020 
Great Falls Pied- 7,020 161 61 10.0 8.0 5.2 56, 160 36,504 
mont 
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Total 336, 747 285, 804 
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