42 
TABLE B-24. Colorado--summary of duck breeding ground population estimates in 
selected areas, 1977. 

Total Est. Breeding Pairs Percent Change 
Long-term, From From Long- 
Area 1977 1976 Average?’ 1976 term Average 
San Luis Valley - 34,759 27,855 - - 
North Park2/ f 16,535 17,115 : : 
South Platte 
Valley - 10,062 6,773 - - 
Cache la Poudre 
Valley - 6,927 3,662 - - 
Yampa Valley 2,189 2,145 2,755 + 2.1 - 20.5 
Brown's Park 1,009 593 1,147 + 70.2 - 12.0 
Total - 71,021 59 ,307 - - 
a as Luis Valley and North Park averages are based on results of 1964 through 
| 1976 and 1968 through 1976 surveys, respectively, because of changes in survey 
methods utilized prior to those dates. Figures for other areas are 22 year 
averages. 
b/ 
— Aerial counts corrected by species from visibility ratios obtained in the 
San Luis Valley. 
TABLE B-25. Colorado--estimated number of Canada geese observed and estimated 
production, Moffat County, 1977. 
ee 
Nesting Non-nesting Total Estimated No. Total 
Birds 
Area Pairs Pairs Adults Gos1ings— 
Yampa River 
Craig-Juniper Springs 25 209 259 72 331 
Juniper Springs-Cross 
Paetain ; 15 122 152 48 200 
Lily Park 14 80 108 50 158 
Subtotal 54 41] 519 170 689 
Green River 
Brown's Park 61 166 288 210 498 
Dinosaur National 
Monument 50 105 205 249 454 
Subtotal 11] 271 493 459 952 
Little Snake River 22 133 177 54 231 
GRAND TOTAL 187 815 1,189 683 1,872 
Te. Oe ee CL Te Cae mee Se fv SN 
calculated using average brood size observed and number of successful nests. 

