Birding spot · Union County, Oregon
Birding at Thief Valley Reservoir: What You'll See Each Week In November, the birds most often reported at Thief Valley Reservoir are Mallard (95%), Bufflehead (93%), and Canada Goose (86%). It is busiest in spring, when 109 species turn up on at least 1 in 20 checklists, and species counts peak in the second week of August (120 species). 193 species have been reported here across 813 complete checklists from 136 birders.
Species by week 0 25 50 75 100 125 Jan 1-7: low data (2 checklists) Jan 8-14: low data (2 checklists) Jan 15-21: low data (4 checklists) Jan 22-31: low data (4 checklists) Feb 1-7: low data (4 checklists) Feb 8-14: low data (6 checklists) Feb 15-21: low data (2 checklists) Feb 22-28: low data (5 checklists) Mar 1-7: low data (8 checklists) Mar 8-14: low data (6 checklists) Mar 15-21: 49 species on 5%+ of 10 checklists Mar 22-31: 59 species on 5%+ of 13 checklists Apr 1-7: 69 species on 5%+ of 16 checklists Apr 8-14: 73 species on 5%+ of 14 checklists Apr 15-21: 85 species on 5%+ of 16 checklists Apr 22-30: 98 species on 5%+ of 41 checklists May 1-7: 94 species on 5%+ of 28 checklists May 8-14: 94 species on 5%+ of 25 checklists May 15-21: 104 species on 5%+ of 19 checklists May 22-31: 97 species on 5%+ of 43 checklists Jun 1-7: 92 species on 5%+ of 16 checklists Jun 8-14: 92 species on 5%+ of 25 checklists Jun 15-21: low data (5 checklists) Jun 22-30: low data (7 checklists) Jul 1-7: low data (7 checklists) Jul 8-14: low data (4 checklists) Jul 15-21: 103 species on 5%+ of 16 checklists Jul 22-31: 98 species on 5%+ of 33 checklists Aug 1-7: 100 species on 5%+ of 23 checklists Aug 8-14: 120 species on 5%+ of 40 checklists Aug 15-21: 100 species on 5%+ of 41 checklists Aug 22-31: 109 species on 5%+ of 53 checklists Sep 1-7: 104 species on 5%+ of 32 checklists Sep 8-14: 97 species on 5%+ of 44 checklists Sep 15-21: 99 species on 5%+ of 34 checklists Sep 22-30: 83 species on 5%+ of 31 checklists Oct 1-7: 66 species on 5%+ of 22 checklists Oct 8-14: 74 species on 5%+ of 11 checklists Oct 15-21: 76 species on 5%+ of 10 checklists Oct 22-31: 60 species on 5%+ of 21 checklists Nov 1-7: 69 species on 5%+ of 15 checklists Nov 8-14: low data (8 checklists) Nov 15-21: 65 species on 5%+ of 12 checklists Nov 22-30: low data (7 checklists) Dec 1-7: low data (4 checklists) Dec 8-14: low data (6 checklists) Dec 15-21: 46 species on 5%+ of 10 checklists Dec 22-31: low data (8 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 Mallard 95% 2 Bufflehead 93% 3 Canada Goose 86% 4 Black-billed Magpie 81% 5 Common Raven 81% 6 Common Goldeneye 79% 7 Green-winged Teal 79% 8 American Wigeon 74% 9 Dark-eyed Junco 69% 10 Eared Grebe 60% 11 Lesser Scaup 57% 12 Northern Pintail 57% 13 Ruddy Duck 55% 14 Northern Flicker 50% 15 Ring-necked Duck 50% 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 Oregon.
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 .
Mallard95%
Bufflehead93%
Canada Goose86%
Black-billed Magpie81%
Common Raven81%
Common Goldeneye79%
Green-winged Teal79%
American Wigeon74%
Dark-eyed Junco69%
Eared Grebe60%
Lesser Scaup57%
Northern Pintail57%
Ruddy Duck55%
Northern Flicker50%
Ring-necked Duck50%