Compiler:      Tom Behnfield 
e-mail:           RBA AT cobirds.org
Date:             September 26, 2017
 
This is the Rare Bird Alert for Tuesday, September 26, sponsored by Denver 
Field Ornithologists and the Bird Conservancy of the Rockies.
 
Highlight species include: (* indicates new information on this species)
NOTE:  The RBA is now using the new AOU checklist and the order of families 
has changes.

Trumpeter Swan (Routt)
Black-bellied Plover (Boulder, Washington)
American Golden-Plover (Adams, Weld)
Snowy Plover (*Washington)
Long-billed Curlew (Douglas)
RED KNOT (Jefferson)
Dunlin (Adams)
Buff-breasted Sandpiper (Kiowa, *Washington)
Short-billed Dowitcher (Logan,)
Solitary Sandpiper (Broomfield, Denver, El Paso)
Red Phalarope (*Jefferson, Larimer, Morgan)
POMARINE JAEGER (Kiowa)
Sabine’s Gull (Douglas, Larimer, Washington)
LAUGHING GULL (Kiowa)
MEW GULL (Larimer)
Lesser Black-backed Gull (Adams, Douglas, Kiowa, Larimer, Pueblo)
GREAT BLACK-BACKED GULL (Jefferson)
Arctic Tern (Jefferson)
Caspian Tern (Washington)
Common Tern (Ouray) 
Broad-winged Hawk (Boulder, Fremont, Kit Carson, Yuma)
RED-SHOULDERED HAWK (Denver)
Olive-sided Flycatcher (Baca)
YELLOW-BELLIED FLYCATCHER (El Paso)
Black Phoebe (Jefferson, *Montrose, Pueblo)
Eastern Phoebe (Adams, El Paso, *Larimer, *Phillips)
Cassin’s Kingbird (Kiowa)
TROPICAL KINGBIRD (El Paso)
Cassin’s Vireo (Denver)
PHILADELPHIA VIREO (*Denver)
Nashville Warbler (Douglas, Larimer)
Blackburnian Warbler (*Larimer)
Chestnut-sided Warbler (Pueblo)
Blackpoll Warbler (Pueblo)
Yellow-throated Warbler (Pueblo)
Black-throated Green Warbler (*Larimer)

*ADAMS COUNTY:*
—On September 18 Jesse Casias reported an American Golden-Plover at Barr 
Lake SP  along the Neidrach Nature Trail & visitor center area. 
—On September 19 the American Golden-Plover was seen again at Barr Lake SP 
 by David Dowell. On September 20 the American Golden-Plover was seen at 
Barr Lake SP.
—On September 21 Scott Somershoe reports the Dunlin at Barr Lake SP, he was 
walking on the Neidrach Nature Trail & Visitor Center. 
—On September 22 Kathy Mihm Dunning reports an Eastern Phoebe at Barr Lake 
SP. 
—On September 23 John Haycraft reports Eastern Phoebe at Barr Lake SP.
—On September 23 Ben Lagasse reports a Dunlin and a Lesser Black-backed 
Gull at Barr Lake SP.
—On September 24 Susan Rosine reported an American Golden Plover on the 
Neidrach Nature Trail

*BACA COUNTY:*
—On September 23 Rebecca Laroche reports an Olive-sided Flycatcher at 
Picture Canyon.

*BOULDER COUNTY*:
—On September 23 Ted Floyd reports a Black-bellied Plover at Lagerman 
Reservoir.
—On September 22 Scott Severs reports a Broad-winged Hawk near 4949 Pearl E 
Circle in Boulder.

*BROOMFIELD COUNTY:*
—On September 23 Matt Hofeditz reported a Solitary Sandpiper at Quail Creek 
Park.

*DENVER COUNTY:*
—On September 19 around 5:30 pm Karl Stecher was driving east on Yale from 
Wadsworth, about eight blocks in,  a RED-SHOULDERED HAWK sailed and flapped 
at treetop level from right to left across the road. He searched the 
neighborhood but did not find the bird.
—On September 23 Doug Kibbe reported a Cassin’s Vireo at Bluff Lake Nature 
Center.
—On September 24 Jeff Dawson reported a Solitary Sandpiper at Westerley 
Creek Park
—On September 25 Doug Kibbe reported a PHILADELPHIA VIREO at Bear Creek 
Park (not Bear Creek Lake Park)

*DOUGLAS COUNTY:*
—On September 21 Anna Troth reports a Long-billed Curlew at Chatfield SP 
Marina Sandspit. On September 22 Gregg Goodrich reports the Long-billed 
Curlew at Chatfield SP Marina Sandspit. 
—On September 23 Gregg Goodrich reports 2 Juvenile Sabine’s Gulls at the 
Chatfield State Park flying over the shore line at the marina sandspit.
—On September 24, Gregg Goodrich reported a GREAT BLACK-BACKED GULL at the 
Marina Sandspit at Chatfield SP
—On September 24 Cynthia Madsen reported a Nashville Warbler at Parker 
Regional Park - AKA Salisbury Equestrian Park
—On September 24 Mackenzie Goldthwaite & Doug Kibbe reported a Lesser 
Black-backed Gull at the Marina Sandspit at Chatfield SP

*EL PASO COUNTY:*
—On September 17 David Tonnessean reported a TROPICAL KINGBIRD at Chico 
Basin Ranch (fee). Photos and recording were made, he will submit to CBRC. 
—On September 23 a YELLOW-BELLIED FLYCATCHER was caught at the Banding 
Station at Chico Basin Ranch (Fee Area)
—On September 24 Steve Brown reported an Eastern Phoebe at Clear Spring 
Ranch
 
*FREMONT COUNTY*
—On September 24 Jerry DeBoer reported a Broad-winged Hawk at the Arkansas 
River Walk, 9th Street to Tunnel Drive

*JEFFERSON COUNTY:*
—On September 20 Pablo Quezada reported a RED KNOT at Chatfield SP, it was 
at the swim beach. It was seen by multiple birders yesterday.
—On September 20 Tom Behnfield reports a Black Phoebe at Chatfield SP, at 
the swim beach.
—On September 22 Steve Rash reports a GREAT BLACK-BACKED GULL at the swim 
beach at Chatfield SP.
—On September 22 Crystal Wilson reports a Black Phoebe at Chatfield SP at 
Deer Creek Inlet into the lake. On September 23 Mary O’Connor reports the 
Black Phoebe at Deer Creek inlet.
—On September 23 Scott Manwaring reports an Arctic Tern at Chatfield SP a 
Plum Creek Delta.
—On September 24 Alison Hixon reported a Black Phoebe at Chatfield SP - 
Original Heronry Overlook
—On September 24 Frank Farrell reported a Red Phalarope at Chatfield SP - S 
Platte River Delta

*KIOWA COUNTY:*
—On September 19 Steve Mlodinow reports POMARINE JAEGER, LAUGHING GULL, 
 Common Tern, and Cassin’s Kingbird at Neenoshe Reservoir. 
—On September 20 Jane Stulp reports a Lesser Black-backed Gull at 
Upper/Queens/Neeskah Res.
—On September 20 Steve Mlodinow reports a Buff-breasted Sandpiper at 
Neenoshe Res., and the continuing LAUGHING GULL.  On September 21 Jane 
Stulp re-found the LAUGHING GULL at Neenoshe Res.

*KIT CARSON COUNTY:*
—On September 23 David Dowell reports a Broad-winged Hawk at Flagler 
Reservoir State Wildlife area.

*LARIMER COUNTY:* 
—On September 19 John Shenot reports the Nashville Warbler at the north end 
of Dixon Res. It was seen from the dam at the north end.
—On September 18 Brad Biggerstaff reports a Nashville Warbler at Dixon Res. 
in west Fort Collins this morning. The bird was also seen by Nick Komar and 
David Wade.  
—On September 21 Nick Komar reports a Lesser Black-backed Gull at Boyd Lake.
—On September 21 Cliff Hendrick reports a Lesser Black-backed Gull at 
Arapahoe Bend Natural Area.
—On September 21 Joe Mammoser reports a Sabine’s Gull at Rigden Res., also 
know as Strauss Cabin Lake, east of Fort Collins. It was frequenting the 
north and west sides of the res.
—On September 23 Kathy Mihm Dunning reports a Red Phalarope at Timnath 
Reservoir.
—On September 24 Brandon Nooner, Nick Komar, Mike McCloy, Danny Montalvo, 
 Austin Hess & David Wade reported a Black-throated Green Warbler at Rigden 
Reservoir (Strauss Cabin Lake) David Leatherman reported the BTGW as well.
—On September 24 Nick Komar & Brandon Nooner reported a MEW GULL at 
Horeshoe Reservoir
—On September 24 Derek Hill and David Leatherman reported Sabine's Gull 
(1st Year) at Rigden Reservoir (Strauss Cabin Lake)
—On September 24 Nick Komar reported an Eastern Phoebe at River Bluffs 
Natural Area
—On September 25 Christine Sparks reported a Black-throated Green Warbler 
at Rigden Reservoir (Strauss Cabin Lake)
—On September 25 David Leatherman reported a Blackburnian Warbler along the 
Poudre north of Prospect Road. See his post in Cobirds for more info.

*LOGAN COUNTY:*
—On September 20 Steve Larson reports a Short-billed Dowitcher at Jumbo 
Reservoir.

*MONTROSE COUNTY: *
—On September 24 Coen Dexter & Brenda Wright reported a Black Phoebe at 
Cooper's Ditch near Nucla
—On September 25 Brenda Wright & Coen Dexter reported a Black Phoebe at the 
Rose Garden near Nucla

*MORGAN COUNTY:*
—On September 21 David Dowell reported a Red Phalarope at Jackson Reservoir

*OURAY COUNTY:  *
—On September 20 Kent Nelson reported a 1st y Common Tern at Ridgway Res.  
This may be a first county record for this species.  Another birder also 
agreed with Kent’s report and got photos of the tern. On September 23 Kent 
Nelson reports the Common Tern is still at Ridgway Res.

*PHILLIPS COUNTY*
—On September 24 David Dowell reported an Eastern Phoebe at Holyoke Cemetery

*PUEBLO COUNTY:*
—On September 20 Brandon Percival reported a Blackpoll Warbler south of the 
Fish Hatchery Building, at Lake Pueblo SP. The bird was high in cottonwood 
trees along with a couple of Wilson’s Warblers.
—On September 21 Brandon Pervical reported a Lesser Black-backed Gull near 
the pool below Pueblo Res. Dam.
—On September 22 Brandon Percival reported a Chestnut-sided Warbler, and a 
Yellow-throated Warbler at Cottonwood Picnic area parking lot below Pueblo 
Res. Dam. Photos were obtained.
—On September 24 Brandon Percival and David Chartier reported a 
Yellow-throated Warbler and 3 Black Phoebes at lake Pueblo SP - Rock 
Canyon/Valco Ponds Area

*ROUTT COUNTY:*
—On September 20 Tom Hall reported an ad Trumpeter Swan at the inlet pond 
on the right of the turn to Stagecoach at Stagecoach Res.
 
*WASHINGTON COUNTY:*
—On September 19 at Prewitt Reservoir, Scott Somershoe reported the 
Buff-breasted Sandpiper was there this morning, along with Black-bellied 
Plover, Pectoral Sandpiper, Stilt Sandpipers, Sanderlings in all plumages 
except breeding. A Sabine’s Gull also flew by while he was there.  On 
September 21 Matt Clark reports seeing the Buff-breasted Sandpiper at 
Prewitt Res. On September 23 Ben Lagasse reports seeing the Buff-breasted 
Sandpiper at Prewitt Res.
—On September 24 Cheri Phillips reported a Snowy Plover at Prewitt Reservoir
—On September 25 Shawn Ashbaugh reported 2 Buff-breasted Sandpiper at 80720, 
Akron US-CO(40.4118,-103.3849)

*WELD COUNTY:*
—On September 23 Gene Rutherford reports 2 American Golden-Plover at Water 
Treatment Plant at Weld Co. Rds. 62.5 and 51.

*YUMA COUNTY:*
—On September 23 David Dowell reports a Broad-winged Hawk near Hwy 59 south 
of Yuma.


*Denver Field Ornithologists Field Trips: *
 
*Eastern Arapahoe and Adams Counties* Tuesday, September 26, 6:00 AM - 2:00 
PM, David Suddjian (Email: dsuddjianATgmail.com Phone: 831-713-8659 
<(831)%20713-8659>,) Trail Difficulty: Moderate
Directions: Meet near Bennet off I-70 at the South side of the King 
Sooper's parking lot. Take I-70 east from Denver to the First Street exit 
and go north. Turn left on West Market Place Drive, then go right into the 
King Sooper's lot. 
We will travel the back roads in search of prairie breeders, shorebirds, 
and possible rare migrants. Some easy walking. We will carpool from the 
meeting place. Restrooms may be limited at times. Bring lunch and liquids. 
Register online or contact leader. 

*Ken Caryl Valley Area* Wednesday, September 27 6:30 AM - 11:00 AM David 
Suddjian (Email: dsuddjianATgmail.com Phone: 831-713-8659 <(831)%20713-8659>) 
Trail Difficulty: Moderate Maximum Participants: 8 
Directions: Meet at the northern (main) parking lot for South Valley Park 
along South Valley Road just east of Valley Parkway. We will carpool to 
another site from there. 
Details: We will visit a few areas in search of a variety of birds at 
private Ken Caryl Ranch. Plan for up to 3-5 miles of mostly easy terrain, 
with some uphill, possible rocky trails and single track. Bring light 
hiking shoes, water and snacks. Register online or contact leader.

*This trip is full, and there is one person on the waiting list*

*Denver City Park*, September 30, 7:00 AM - 11:00 AM, Patrick O'Driscoll 
(email patodriskATgmail.com Phone: 303-885-6955 <(303)%20885-6955>,) Trail 
difficulty: Easy, Maximum participants: 14. 
Directions:Meet at parking strip on north side of Ferril Lake. Enter park 
from Colorado Blvd. Northbound turns left onto 22nd Ave. past Museum of 
Nature & Science; southbound turns right onto 22nd at police station. Go 
past museum parking until road curves toward zoo. Take immediate left at 
"To Pavilion Bandstand" sign and go 300 yards down to corner with tall 
spruce trees, where lake comes into view. Park diagonally on left beneath 
spruces. 
We'll check on the cormorant and egret colonies but focus on early autumn 
migrants. The last day of September (and our DFO Big Month) is on the cusp 
for returning waterfowl and winter residents, migrant warblers and other 
southbounders. We'll walk 2-3 miles, from Ferrill Lake to the "pinetum" 
below the Denver Museum of Nature and Science and back west to Duck Lake 
and productive old groves on the park's west side. Dress for the weather 
and bring water and snacks. Register online or contact leader. 

*8 people have registered for this trip. There are 6 spaces available.*

*First Creek at RM Arsena*l October 1, 7:00 AM - 12: PM, John Breitsch 
(jbreitschAThotmail.com or 303-588-0552 <(303)%20588-0552>), Trail 
difficulty: Easy, Maximum participants: 15.
Directions: From East Denver take 56th Ave east toward Pena Blvd. First 
Creek parking lot is just before Pena on your left (north). Or take I-70 
east to Pena Blvd. Drive north to 56th Ave Exit. Turn left at the light and 
at the bottom of the off ramp, pass under the highway and turn right, 
almost immediately, into the First Creek parking lot.
We will start at the same parking lot as 1st Creek @ DOS. We will walk up 
Buckley Road, then we turn west at the creek instead of east. The trail 
should be finished all the way out to the concrete bunker that can be used 
as a viewing blind. We'll hope to see some late migrants and a few resident 
species. Until recently, this was a part of the RM Arsenal that was 
inaccessible. It should make for great raptor viewing over the winter 
months. There currently are no restroom facilities.

*There are 8 people registered for this trip. There are 7 spaces left*
 

*For more information on the field trips go to* dfobirds.org.
 
Good Birding,

Tom Behnfield
Lakewood, CO

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