Date: 9/21/18 5:56 am
From: Amy Davenport <cobussec...> [cobirders] <cobirders-noreply...>
Subject: [cobirders] Colorado Rare Bird Alert for September 21, 2018
Hello cobirders

Our report is called Rare Bird Alert because search engines find it
better. The report is really "Uncommon Bird Report" Not all uncommon
birds are rare birds. Birders may want to know where to see them anyway!
Without being a member, "cobirders" can be read at:

Report Uncommon Birds at: 303-324-7994 or

NOTE: Reports do not confirm sightings. Choose to chase at your own risk
and expense.!
NOTE: To reduce length of report, only recent sightings listed; visit
Colorado Birding Society's website everyday for additional sightings!

Reports added: 9/20/2018
Adams (Gray Flycatcher, Townsend's Warbler, Northern Waterthrush)
Alamosa (Cassin's Vireo)
Boulder (Gray Flycatcher, Sage Thrasher)
Costilla (Sabine's Gull, Long-billed Curlew)
Denver (Green Heron)
Douglas (Eastern Bluebird)
El Paso/Pueblo (Ladder-backed Woodpecker, Curve-billed Thrasher, Cassin's
Vireo, Northern Mockingbird)
Jefferson (Ruby-throated Hummingbird, Common Tern)
Jefferson/Douglas (Eastern Phoebe, Northern Waterthrush)
Larimer (American Redstart, Townsend's Warbler, Eastern Screech-Owl,
American Three-toed Woodpecker, Common Tern, Cassin's Vireo, Sage Thrasher)
Logan (Red-bellied Woodpecker, American Redstart)
Montrose (Pinyon Jay)
Ouray (Cassin's Vireo)
Pueblo (Long-tailed Jaeger, Parasitic Jaeger, Common Tern, Sage Thrasher)
Saguache (Cassin's Vireo)
San Miguel (Northern Mockingbird)
Summit (Sage Thrasher)
Teller (Olive-sided Flycatcher)
Weld (Cassin's Kingbird, Marbled Godwit)


Adams County
++++Barr Lake
Gray Flycatcher (McBurney) first 9/20
Townsend's Warbler (2) (McBurney) first 9/20
Northern Waterthrush (McBurney) first 9/20
Red-eyed Vireo (McBurney) first 9/19

Arapahoe County
++++Coal Creek Regional Park
Red-eyed Vireo --east end of trail (Terry Michaels) first 9/18
++++Cherry Creek Reservoir area
Mew Gull (Ben Sampson/Stevens) (first 8/13) last 9/17
Sabine's Gull (2) (Stevens) (first 9/10) adult; 9/17

Boulder County
++++Mesa Reservoir Map
Gray Flycatcher (Christian Nunes) first 9/20
Sage Thrasher (17) (Nunes) first 9/20
++++Apple Valley Road, north of Lyons
Cassin's Vireo (Chris Brown/Luke & Tracy Pheneger) (first 9/15) last 9/19
++++Pleasant View Marsh
Black-and-white Warbler (Ernest Crvich) first 9/19
++++Brainard Lake Area, Mt Audubon Trail
White-tailed Ptarmigan (Chris Brown) 3; last 9/19
Dusky Grouse (Chris Brown) last 9/19
Brown-capped Rosy Finch (3) (Chris Brown) last 9/19
++++Boulder (4949 Pearl East Circle)
Broad-winged Hawk (Scott Severs) first 9/19

Denver County
++++Bluff Lake Nature Area
Green Heron (George Ho) (first 6/21) last 9/20

Douglas County
++++Cherry Creek Trail & Walker Pit Map
Eastern Bluebird (Hugh Kingery) first 9/20

El Paso County
++++Kettle Lakes
Eastern Phoebe (John Drummond) first 9/18
++++Paint Mines Interpretive Park
Sage Thrasher (Scott Chalmers) first 9/18
++++Clear Spring Ranch
Ladder-backed Woodpecker (Goff & all) first 9/17
Nashville Warbler (Ketcham) first 9/17
++++Adams Open Space
Olive-sided Flycatcher (Terence Berger) first 9/17

El Paso/Pueblo Counties County
++++Chico Basin Ranch (fee area)
Ladder-backed Woodpecker (Merritt) last 9/20
Curve-billed Thrasher (Jim Merritt) last 9/20
(all above: Headquarters, Pueblo County)
Cassin's Vireo (Kim Geissler) (first 9/8) 2; last 9/20
Ladder-backed Woodpecker (Jim Merritt) last 9/20
Curve-billed Thrasher (Jim Merritt) last 9/20
Northern Mockingbird (Jim Merritt) last 9/20
(above: banding station unless stated elsewhere, El Paso County)

Jefferson County
++++4400 West Bow Mar Drive, Littleton Map
Ruby-throated Hummingbird (Tina Jones) (first 9/19) last 9/20
(use chairs in backyard, let Tina know if coming: <tjcalliope...>)
++++Standley Lake Map
Common Tern (David Chenack) first 9/20
++++Golden Gate Canyon State Park
Sage Thrasher (Cynthia Madsen) first 9/18

Jefferson/Douglas County
++++Chatfield Reservoir
(NOTE: see directions on construction updates)
Eastern Phoebe --Deer Creek, north end of swim beach
(Farrell:Madsen/Raker:Chavez) (first 9/19) last 9/20
Eastern Phoebe (2) --Denver Botanic Gardens (Cynthia Madsen) last 9/20
Northern Waterthrush (2) --gazebo heronry overlook area (Ted Uhlemann)
first 9/20

Larimer County
++++Grandview Cemetery Map
American Redstart (Leatherman/Josh Bruening) (first 9/19) last 9/20
Broad-winged Hawk (David Leatherman) first 9/19
Townsend's Warbler (David Wade/Leatherman) (first 9/16) last 9/19
++++Dixon Reservoir Map
Townsend's Warbler (Nick Komar) first 9/20
Blackpoll Warbler (Nick Komar/Biggerstaff) (first 9/6) last 9/16
++++Spring Canyon Community Park Map
Eastern Screech-Owl (Kevin Keirn) last 9/20
++++Rocky Mountain National Park
American Three-toed Woodpecker (1) --Bear Lake area (Josh Beck) last
Brown-capped Rosy Finch (6) --Alpine Visitor's Center (Sue Riffe) last
++++Wellington Wildlife Area, Cobb Lake Map
Common Tern (3) (Andy Bankert:Nick Komar) first 9/20
Cassin's Vireo (Olson:Bankert/Bankert:Komar) (first 9/16) last 9/20
Sage Thrasher (Olson:Bankert/Bankert:Komar) (first 9/16) 2; last 9/20
++++Horseshoe Lake
Mew Gull --pond north of lake (Nick Komar) first 9/19
++++Timnath Reservoir
Pectoral Sandpiper (Nick Komar) 4; last 9/19
Burrowing Owl (3) (Nick Komar) last 9/19
++++Greyrock Commons Trail
Nashville Warbler (Doug Swartz) first 9/19
++++Arapahoe Bend Natural Area (Rigden Reservoir)
Red-headed Woodpecker (Fawn Simonds/Lori Nixon) (first 9/18) last 9/19
++++Near Rawhide Reservoir
Burrowing Owl --CR 5/north of Buckeye Road (Doyle/Jay Breidt) (first
4/27) 2; last 9/18

Pueblo County
++++Pueblo Reservoir
Long-tailed Jaeger (juv) (Percival/Mark Peterson) (first 9/13) 2; last
Parasitic Jaeger (Percival/Mark Peterson) (first 9/13) last 9/20
(Could be Chatfield State Park jaegers, last seen 9/18)
Common Tern (6) (Percival/Ketcham) (first 9/19) last 9/20
Sage Thrasher (Aaron Driscoll) first 9/20
Red-necked Phalarope (7) (Percival) first 9/19
Lesser Black-backed Gull (2) (Percival) (first 9/13) 1st year; last 9/19
Palm Warbler (western) --near Snakeskin Picnic area (Percival) first 9/19
++++Valco Ponds Wildlife Area
Green Heron (David Tonnessen) last 9/19

Weld County
++++Crow Valley Map
Cassin's Kingbird (David Leatherman) first 9/20
++++Baxter Lake Map
Marbled Godwit (1) (Mlodinow) (first 9/6) 1; last 9/20
++++Union Reservoir & area
Common Tern (Mlodinow/John Rutenbeck) (first 9/15) last 9/19
++++Pawnee National Grasslands area
Sage Thrasher --CR 96/east/CR 69 (Marcel Such) first 9/19


Kiowa County
++++Neenoshe Reservoir
Black-bellied Plover (3) (Suddjian) first 9/18
Semipalmated Plover (3) (Mlodinow) first 9/18
Red-necked Phalarope (2) (David Dowell/Mlodinow) (first 9/16) last 9/18
Cassin's Vireo (Mlodinow) first 9/18
Red Phalarope (Mlodinow) reported 9/18
++++Neegronda Reservoir
American Golden-Plover (2, flyover) (Steve Mlodinow) reported 9/18
Pectoral Sandpiper (7) (Mlodinow) first 9/18
Red-necked Phalarope (7) (Mlodinow) first 9/18
American Bittern (Mlodinow) first 9/18
Bonaparte's Gull (Mlodinow) first 9/18
Common Tern (Mlodinow) first 9/18
++++Upper Queens Reservoir
Marbled Godwit (Mlodinow) first 9/18
Common Tern (3) (Mlodinow) first 9/18
Broad-winged Hawk (Mlodinow) first 9/18
Barn Owl (Mlodinow) last 9/18
Magnolia Warbler (Mlodinow) first 9/18

Otero County
++++Lake Holbrook
Pectoral Sandpiper (3) (Dowell/Suddjian) (first 9/15) 2; last 9/19
Red-necked Phalarope (19) (Suddjian & all) (first 8/27) last 9/19

Prowers County
Ruby-throated Hummingbird --S. 13th Street/W. Parkway Drive (Russell)
(first 9/16) 2 male, 1 female; last 9/19
++++North Gateway Park
Yellow-billed Cuckoo (David Suddjian) first 9/18
++++Lamar Community College
Chestnut-collared Longspur (Suddjian) first 9/18


Logan County
++++Tamarack Ranch Wildlife Area
Red-bellied Woodpecker (1) (Bez Bezuidenhout) last 9/20
American Redstart (Bezuidenhout) first 9/20
Eastern Screech-Owl (Stevens:Michaels) last 9/19
Yellow-billed Cuckoo (Stevens:Michaels) last 9/19
Red-headed Woodpecker (4) (Stevens:Michaels) last 9/19
Field Sparrow (Stevens:Michaels) last 9/19
Cassin's Vireo (Stevens:Michaels) last 9/19
Blue-headed Vireo (Stevens:Michaels) last 9/19
Nashville Warbler (Stevens:Michaels) last 9/19
Magnolia Warbler (Stevens:Michaels) last 9/19
Blackburnian Warbler (Stevens:Michaels) last 9/19
++++Red Lion Wildlife Area
Cassin's Kingbird (Stevens:Michaels) first 9/19
Nashville Warbler (Stevens:Michaels) first 9/19
(above: Little Jumbo Reservoir)

Logan/Sedgwick Counties
++++Jumbo Reservoir
Pectoral Sandpiper (15) (Bill Kaempfer/Stevens:Michaels) (first 9/13)
last 9/19
Common Tern (Stevens:Michaels) first 9/19

Logan/Washington Counties
++++Prewitt Reservoir area
Eastern Screech-Owl (Stevens) last 9/18
Red-necked Phalarope (2) (Doug Faulkner/Stevens) (first 8/21) 21; last
Common Tern (Bob Spencer/Stevens) (first 9/1) 1; last 9/18

Morgan County
++++Jackson Reservoir & area
Cassin's Vireo (Stevens) first 9/18
Red-eyed Vireo (Stevens) first 9/18
Blackpoll Warbler (Stevens) first 9/18
Townsend's Warbler (2) (Stevens) first 9/18
Long-eared Owl (Stevens) last 9/18


Alamosa County
++++Mosca Pass Trail
Cassin's Vireo (John Rawinski) first 9/20

Clear Creek County
++++Mt. Evans Road
Barrow's Goldeneye (up to 11) --Echo Lake (Nathan Senner/Bob Harvey)
(first 5/2) 3; last 9/17
White-tailed Ptarmigan (2) --south/Summit Lake area
(Stevens:Michaels/Harvey) (first 5/30) last 9/17
Brown-capped Rosy Finch (3) --Summit Lake (Stevens:Michaels/Harvey)
(first 5/30) 2; last 9/17
American Three-toed Woodpecker --Echo Lake Campgrounds
(Stevens:Michaels/Harvey) (first 5/30) last 9/17

Costilla County
++++Smith Reservoir Map
Sabine's Gull (1) (David Dowell/John Rawinski) (first 9/16) last 9/20
Long-billed Curlew (Rawinski) first 9/20

Eagle County
++++Walking Mountains Science Center, Avon
Cassin's Vireo (Aidan Goldie) first 9/18

Fremont County
++++Skyline Drive & Park
Curve-billed Thrasher (Jerry DeBoer) (first 6/16) last 9/19

Jackson County
++++County Road 22
Greater Sage-Grouse (18) (Kathy Carroll/Diane Persons) (first 9/18) last

Mesa County
++++Connected Lakes State Park Area
Townsend's Warbler (Adam Cupito) first 9/19
++++Powderhorn Ski Area, Grand Mesa (Hwy 65)
Lewis's Woodpecker (Mike Henwood) first 9/19
Olive-sided Flycatcher (Mike Henwood) first 9/19
Cassin's Vireo (Mike Henwood) first 9/19
Pinyon Jay (35) (Mike Henwood) first 9/19
++++Horsethief Canyon Wildlife Area
Cassin's Vireo (Douglas Diekman) first 9/18
Black Phoebe (Ronda Woodward) last 9/16

Montezuma County
++++Totten Reservoir
Red-necked Grebe (adult, basic) --northeast section (Jim Beatty/Erik
Hendrickson) (first 9/15) last 9/16

Montrose County
++++Nucla Map
Pinyon Jay (52) --East 5th Avenue (Dexter:Wright) last 9/20

Ouray County
++++Ouray Perimeter Trail Map
Cassin's Vireo (Jon Horn/Woodie Lackey) (first 9/10) last 9/20

Park County
++++Eleven Mile State Park
Sabine's Gull (David Tonnessen) first 9/17
Chestnut-collared Longspur (David Tonnessen) first 9/17

Saguache County
++++Russell Lakes Wildlife Area Map
Cassin's Vireo (Jon Horn) first 9/20
American Bittern (Charles Martinez) last 9/19

San Miguel County
++++Norwood Map
Northern Mockingbird (2) --see map (George Steele) first 9/20

Summit County
++++Dillon Reservoir Map
Sage Thrasher --Frisco marina area (M. Walt) first 9/20

Teller County
++++Highway 67
Olive-sided Flycatcher (Nathan Pieplow) first 9/20

Good Birding!

Directions to birding spots and s on CoBus website:

Amy Davenport, Secretary, Colorado Birding Society Denver, CO
Contact CoBus/Report Interesting Birds: 303-324-7994
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