
Breeding Population Indices - 
The aerial survey of 1956 covered the same routes and distance as the 
1955 survey. Water conditions were good along all aerial routes. The 
following table gives a comparative summary of the results of the 1955 and 
1956 surveys: | 
Table I - Total Ducks Counted by Area and Square Mile as Determined from 
Aerial Surveys - 1955 and 1956 7 


Total 
Sq.Mi. Sampled Ducks..Counted :- Ducks/Sq. Mile 
Route... 1955 1956 1955 1956 1955 1956 
Box Elder County 48.0 48.0 3,958 2,971 82.5 61.9 
Weber County 12/5 15.5 1,390 1,119 89.6 77.2 
Davis County 14,2 14.2 409 1, 742 28.1 122.6 
Jordan River Clubs 6.2 6.2 584 1,971 . 94.2 317.9 
Salt Lake County 6.7 6.7 91 201 13.6 30.0 
Utah County 18.0 18.0 380 474 21.2 26.3 
Total 108.6 108.6 6,812 9,478 62.7 78.1 
There was a 24 percent increase in the population of ducks along the 
aerial transect routes of northern Utah which cover the bulk of the waterfowl 
breeding grounds. The count in Box Elder County showed a marked decline, 
but this was offset by a large increase in the population of Davis County and 
the Jordan River clubs. 
Ground Census 
Ground counts on State waterfowl refuges indicated a slight increase in 
the breeding population of these areas. The population of the Public Shooting 
Grounds had the largest increase. The population of redheads again increased 
on all areas, but the population of cinnamon teal decreased. 
Table II - Estimate of Total Breeding Pairs on Three State Refuges from 
Dike Line Census - 1955 and 1956 

Public Shooting 

Ogden Bay Farmington Bay Grounds 
Species 1955 1956 1955 1956 1955 1956 
Canada Geese 63 87 43 36 8 12 
Mallard 395 415 26 30 48 61 
Gadwall 189 210 28 34 15 18 
Pintail 214 170 42 41 8 18 
Cinnamon Teal 515 490 105 102 75 79 
Continued -- 
24 
