Birding spot · St. Charles County, Missouri
Birding at Alton Slough: What You'll See Each Week In November, the birds most often reported at Alton Slough are Canada Goose (85%), Mallard (84%), and Ring-billed Gull (83%). It is busiest in spring, when 106 species turn up on at least 1 in 20 checklists, and species counts peak in the second week of May (112 species). 280 species have been reported here across 7,626 complete checklists from 1,588 birders.
Species by week 0 25 50 75 100 125 Jan 1-7: 60 species on 5%+ of 301 checklists Jan 8-14: 58 species on 5%+ of 150 checklists Jan 15-21: 57 species on 5%+ of 139 checklists Jan 22-31: 57 species on 5%+ of 224 checklists Feb 1-7: 62 species on 5%+ of 146 checklists Feb 8-14: 60 species on 5%+ of 125 checklists Feb 15-21: 61 species on 5%+ of 132 checklists Feb 22-28: 59 species on 5%+ of 147 checklists Mar 1-7: 68 species on 5%+ of 110 checklists Mar 8-14: 67 species on 5%+ of 93 checklists Mar 15-21: 68 species on 5%+ of 131 checklists Mar 22-31: 74 species on 5%+ of 211 checklists Apr 1-7: 79 species on 5%+ of 140 checklists Apr 8-14: 81 species on 5%+ of 125 checklists Apr 15-21: 89 species on 5%+ of 187 checklists Apr 22-30: 90 species on 5%+ of 307 checklists May 1-7: 111 species on 5%+ of 232 checklists May 8-14: 112 species on 5%+ of 153 checklists May 15-21: 109 species on 5%+ of 165 checklists May 22-31: 78 species on 5%+ of 248 checklists Jun 1-7: 72 species on 5%+ of 104 checklists Jun 8-14: 70 species on 5%+ of 75 checklists Jun 15-21: 64 species on 5%+ of 68 checklists Jun 22-30: 78 species on 5%+ of 58 checklists Jul 1-7: 71 species on 5%+ of 88 checklists Jul 8-14: 77 species on 5%+ of 80 checklists Jul 15-21: 78 species on 5%+ of 89 checklists Jul 22-31: 78 species on 5%+ of 190 checklists Aug 1-7: 71 species on 5%+ of 125 checklists Aug 8-14: 73 species on 5%+ of 142 checklists Aug 15-21: 74 species on 5%+ of 124 checklists Aug 22-31: 78 species on 5%+ of 135 checklists Sep 1-7: 85 species on 5%+ of 101 checklists Sep 8-14: 68 species on 5%+ of 126 checklists Sep 15-21: 98 species on 5%+ of 77 checklists Sep 22-30: 85 species on 5%+ of 136 checklists Oct 1-7: 79 species on 5%+ of 122 checklists Oct 8-14: 77 species on 5%+ of 191 checklists Oct 15-21: 73 species on 5%+ of 112 checklists Oct 22-31: 73 species on 5%+ of 238 checklists Nov 1-7: 71 species on 5%+ of 179 checklists Nov 8-14: 67 species on 5%+ of 154 checklists Nov 15-21: 71 species on 5%+ of 226 checklists Nov 22-30: 71 species on 5%+ of 299 checklists Dec 1-7: 69 species on 5%+ of 246 checklists Dec 8-14: 67 species on 5%+ of 192 checklists Dec 15-21: 66 species on 5%+ of 187 checklists Dec 22-31: 66 species on 5%+ of 296 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 Canada Goose 85% 2 Mallard 84% 3 Ring-billed Gull 83% 4 Double-crested Cormorant 67% 5 Trumpeter Swan 67% 6 Great Blue Heron 63% 7 Gadwall 63% 8 American White Pelican 60% 9 Greater White-fronted Goose 57% 10 Lesser Scaup 53% 11 Hooded Merganser 52% 12 American Coot 52% 13 Ruddy Duck 51% 14 Northern Harrier 48% 15 Northern Shoveler 46% 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 Missouri.
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 .
Canada Goose85%
Mallard84%
Ring-billed Gull83%
Double-crested Cormorant67%
Trumpeter Swan67%
Great Blue Heron63%
Gadwall63%
American White Pelican60%
Greater White-fronted Goose57%
Lesser Scaup53%
Hooded Merganser52%
American Coot52%
Ruddy Duck51%
Northern Shoveler46%