Birding spot · Jefferson County, Colorado
Birding at Chatfield Lake (Fairview Reservoir Number 2): What You'll See Each Week In November, the birds most often reported at Chatfield Lake (Fairview Reservoir Number 2) are Black-billed Magpie (92%), American Crow (86%), and Mallard (84%). It is busiest in spring, when 73 species turn up on at least 1 in 20 checklists, and species counts peak in mid September (83 species). 157 species have been reported here across 1,041 complete checklists from 444 birders.
Species by week 0 20 40 60 80 100 Jan 1-7: 35 species on 5%+ of 15 checklists Jan 8-14: 37 species on 5%+ of 18 checklists Jan 15-21: 36 species on 5%+ of 32 checklists Jan 22-31: 37 species on 5%+ of 26 checklists Feb 1-7: 41 species on 5%+ of 15 checklists Feb 8-14: 40 species on 5%+ of 13 checklists Feb 15-21: 39 species on 5%+ of 22 checklists Feb 22-28: 47 species on 5%+ of 20 checklists Mar 1-7: 42 species on 5%+ of 18 checklists Mar 8-14: 46 species on 5%+ of 10 checklists Mar 15-21: 52 species on 5%+ of 24 checklists Mar 22-31: 52 species on 5%+ of 30 checklists Apr 1-7: 51 species on 5%+ of 22 checklists Apr 8-14: 68 species on 5%+ of 16 checklists Apr 15-21: 62 species on 5%+ of 27 checklists Apr 22-30: 69 species on 5%+ of 35 checklists May 1-7: 52 species on 5%+ of 21 checklists May 8-14: 70 species on 5%+ of 31 checklists May 15-21: 79 species on 5%+ of 35 checklists May 22-31: 65 species on 5%+ of 42 checklists Jun 1-7: 62 species on 5%+ of 20 checklists Jun 8-14: 56 species on 5%+ of 25 checklists Jun 15-21: 63 species on 5%+ of 28 checklists Jun 22-30: 54 species on 5%+ of 21 checklists Jul 1-7: 61 species on 5%+ of 19 checklists Jul 8-14: 51 species on 5%+ of 21 checklists Jul 15-21: 59 species on 5%+ of 30 checklists Jul 22-31: 52 species on 5%+ of 28 checklists Aug 1-7: 47 species on 5%+ of 21 checklists Aug 8-14: 67 species on 5%+ of 19 checklists Aug 15-21: 55 species on 5%+ of 21 checklists Aug 22-31: 51 species on 5%+ of 24 checklists Sep 1-7: 55 species on 5%+ of 16 checklists Sep 8-14: 51 species on 5%+ of 14 checklists Sep 15-21: 83 species on 5%+ of 16 checklists Sep 22-30: 52 species on 5%+ of 13 checklists Oct 1-7: 47 species on 5%+ of 10 checklists Oct 8-14: 43 species on 5%+ of 14 checklists Oct 15-21: 65 species on 5%+ of 17 checklists Oct 22-31: 40 species on 5%+ of 23 checklists Nov 1-7: 41 species on 5%+ of 11 checklists Nov 8-14: 47 species on 5%+ of 20 checklists Nov 15-21: 46 species on 5%+ of 22 checklists Nov 22-30: 41 species on 5%+ of 44 checklists Dec 1-7: 45 species on 5%+ of 29 checklists Dec 8-14: 46 species on 5%+ of 12 checklists Dec 15-21: 46 species on 5%+ of 15 checklists Dec 22-31: 39 species on 5%+ of 16 checklists Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Number of species reported on at least 5% of complete checklists, by week (4 per month). Grey bars: fewer than 10 checklists, not counted. In November: what to expect 1 Black-billed Magpie 92% 2 American Crow 86% 3 Mallard 84% 4 Northern Flicker 78% 5 Red-tailed Hawk 73% 6 Dark-eyed Junco 72% 7 Canada Goose 67% 8 House Finch 67% 9 Black-capped Chickadee 65% 10 Red-winged Blackbird 63% 11 Rock Pigeon 61% 12 American Robin 56% 13 Song Sparrow 55% 14 Blue Jay 52% 15 Ring-necked Duck 51% Share of complete checklists at this spot that reported the bird in November. The sparkline is the whole year, with this month highlighted.
Season by season Specialties Birds reported far more often here than across Colorado.
Nearby spots Frequency is the share of complete checklists at this location that listed the bird, 2016–2025. Busy places report more of everything, and the weekly chart counts species on at least 5% of checklists so a few stray reports do not inflate it. How to read it .
Black-billed Magpie92%
American Crow86%
Mallard84%
Northern Flicker78%
Red-tailed Hawk73%
Dark-eyed Junco72%
Canada Goose67%
House Finch67%
Black-capped Chickadee65%
Red-winged Blackbird63%
Rock Pigeon61%
American Robin56%
Song Sparrow55%
Blue Jay52%
Ring-necked Duck51%