Field Trips

The 2022-2023 field trip season continues! We’ll be revisiting many of our traditional destinations, as well as exploring a few new ones. Descriptions of upcoming trips may be found on the Calendar, along with links for registration.
Out of respect for the health of our members and community we continue to ask trip participants to take sensible precautions. Pre-registration, currently handled online through Eventbrite, is required to ensure groups are not overcrowded. At present, MDAS events do not require carpooling – though participants are of course free to make their own arrangements. As the need for safe spacing limits group size, be aware of the need to sign up early to make sure you get a spot! And if you discover that you won’t be able to attend a trip you’ve signed up for, please cancel via Eventbrite to open that spot up for someone else.
As usual, the field trips will be ranked according to difficulty:
Category 1: Easy, little or no walking, smooth paths.
Category 2: Moderate, 1 mile or more, possibly rough terrain.
Category 3: Difficult, extensive walking on rough terrain.
Note that some excursions we had planned to repeat this year to great hotspots are at risk of being skipped for want of leaders. New leaders are always needed! This is a fun way to serve our chapter’s mission, while sharing a day out in nature with your fellow enthusiasts. We need leaders to take over trips to familiar places, and are always interested too in exploring new hotspots. If you’re interested in serving as a trip leader please contact Matt Tarlach, our Field Trip Coordinator: . He’ll send you the one-page “Guidelines for Field Trip Leaders” and outline what’s required. The most important thing is to know where the bathrooms are! The bird-spotting is a group effort.

Self-guided Birding Hotspots

In addition to our scheduled MDAS Field Trips, you may want to go birding on your own. Thanks in large part to intense efforts put into conservation and restoration over the past several decades, we’re fortunate to have many productive spots in the area:

Hayward Regional Shoreline
This is a very popular location for walkers, fishing persons, and birders. Parking at the Winton Avenue parking lot is best at the first area before entering through the open gate. One can walk to the low, elevated mound known as “Mt. Trashmore.” Can you guess what is below the dirt and short grass vegetation? It’s about a half-mile walk out to the edge of San Francisco Bay along the flood control channel. Going north past another landfill area brings one to a large, mostly dry mudflat known as “Frank’s Dump.” This spot can be heaven for shorebirds in late summer and fall, as they either gather for the winter or use the area as a stopping point during their southerly migration. One can see Willets, Marbled Godwits, Red Knots, Short-billed Dowitchers, Ruddy Turnstones, Black-bellied Plovers, and the occasional Pacific Golden-Plover. Migrant passerines may be seen in the trees and weedy areas near the parking lot; raptors can be anywhere.

Hawk Hill, Marin Headlands
In September and October the southward migration of raptors here can be quite spectacular. As birds fly south along the California coast they eventually arrive at the Golden Gate, the one-mile wide opening to our bay. Birds don’t like flying over the water and as a consequence, raptors congregate at what is now known as Hawk Hill northwest of the Golden Gate Bridge. They circle above the hills on the rising thermals to gain altitude before finally making the jump across the gap. Since raptors like to use the solar-heated air to ease their flight south, birding here is often best around mid-day. The Golden Gate Raptor Observatory conducts a count every fall of all the raptors, often reaching into the hundreds per day. In recent years the area where the counters stand has been closed to the public but anyone can stand nearby at Battery 129. Public demonstrations are sometimes given on Saturdays – check with the GGRO website for events. Parking, though, is sometimes easier on a weekday. And watch out for Fleet Week, when the hills are packed with crowds watching the bigger, louder, jet-powered birds of the Navy’s air show!

Elsie Roemer Bird Sanctuary, Alameda
This Alameda site is really good for shorebirds, as well as gulls, waders, and others. The main viewing site is an accessible platform overlooking the mudflats and the Bay, off Shore Line Drive near the end of Broadway. (Please obey postings, and do not intrude on sensitive habitat areas.) Check a tide table before going to learn the best time to arrive – ideally about 1.5 hours before a high tide. Street parking is usually available in the area, but can be tight on Fridays when Shore Line Drive is closed to parking for street cleaning.

Abbotts Lagoon, Point Reyes National Seashore
Prime time for this hotspot on the northern Marin coast is the second half of October, but other times can be good. It requires driving to Point Reyes and turning onto Pierce Point Road. A 1-1/2 mile walk through the coastal habitat brings one to a bridge over the upper lagoon. Another 1/2 mile walk across sand and along the edge of the outer lagoon will bring one to the beach. A more rigorous 5,100 mile swim will take one to Japan. Birds we’ve seen here include sparrows, shorebirds, and raptors. The outer lagoon frequently has a good selection of shorebirds which will stay most of the winter. Snowy Plovers nest along the beach and south of the outer lagoon—they are often easy to find. American Pipit flocks need to be checked for possible Red-throated Pipits. In late October we’ve often seen a good selection of raptors including Red-tailed and Ferruginous Hawks, Northern Harriers, and White-tailed Kites. Check the Point Reyes National Seashore website for access updates.

Bodega Bay
Not only is Bodega Bay famous for its role in the Hitchcock movie The Birds, but it is also famous for the many birds which can be found there. Starting in early fall and continuing through the winter, many shorebirds and waterfowl make Bodega Harbor their winter home. Any number of locations around the harbor can be visited for birding opportunities: The boardwalk behind the Tides Restaurant, Porto Bodega, the Rail Pond, Gaffney Point, Owl Canyon, Campbell Cove, and Bodega Head, among others.
Bird Walk Coastal Access Trail:

Other bayside locations to try are:

Within Contra Costa County, you might try:

East Contra Costa County Birding Spots
Jerry Britten, MDAS President

Clifton Court Forebay
This is one of the most productive birding hotspots in the entire county, with over 200 species recorded on eBird. This can easily be an all-day birding expedition. During the fall, winter, and spring, thousands of gulls, scaup, and coots along with myriad other waterfowl are present here. During the summer months uncommon birds and rarities such as Western Sandpiper, White-faced Ibis, and Bank Swallow can be found. Good numbers of raptors are always present, including resident Bald Eagles. Great-horned Owls are often seen. Otters and even Sea Lions can frequently be observed. The parking area is at the end of Clifton Court Road off of Highway J4 a few miles southeast of Byron. It’s an out-and-back trip, as the paved levee road goes 90% of the way around the reservoir, leaving an open stretch of water between you and your car. Going to the end of this road and back is an approximately 16-mile roundtrip, so it is best explored with a bicycle, electric scooter, or other mode of transportation. A 5–6-mile roundtrip takes you to out to Eucalyptus Island, where there are large rookeries of Double-crested Cormorants, egrets, and herons in-season.  Out here are also good-quality dirt levee roads, connected to the paved road, that overlook very productive marshland, slough, and brush habitat along Italian Slough and Old River. The entire route is exposed with no shade, and can be windy at times.

Round Valley Regional Park
This 2191-acre preserve contains non-native grassland, oak woodland/savannah, shrubland, and riparian woodland plant communities. The park entrance is off of Marsh Creek Road between Deer Valley Road and Camino Diablo intersections.  The park has become very popular with local residents, so the large parking lot often fills up on weekends.  According to eBird, 145 species have been recorded here.  Typical woodland birds can be found, as well as grassland birds in the open valley that makes up a large fraction of the park.  Sometimes, large flocks of Long-billed Curlews forage in the valley during the fall and winter. The best birding is at the back of the park, along its southwestern edge that abuts Morgan Territory Regional Preserve and Los Vaqueros Watershed land.  This is about 3 miles from the trailhead, so a mountain-bike trip is a good way to explore it along the mostly-gently-sloping Miwok Trail.  Back in this area Lewis’s Woodpeckers have been reliable for several years.   As many as a dozen at one time have been recorded.  There are a couple of stock tanks in this area, which are good for loitering near to watch several species of birds come to take a drink.  The steep ridgeline at the park’s southwestern border was scorched, and, in some areas, burned to bare dirt by the August 2020 wildfires.  It will be interesting to see how this impacts local birdlife during the next several years.

Creekside Park (including Creek Road), Brentwood
This is the birding hotspot for fall, winter, and spring rarities in East County.  Several species are regularly seen here that are uncommon but findable farther west, but very scarce in East County.  Such birds include Golden-crowned Kinglets, Red-breasted Nuthatches, and Chestnut-backed Chickadees.   Often, scarce winter warblers such as Townsend’s, Black-throated Gray, and Orange-crowned are recorded.   Over-wintering Western Tanagers as well as vagrant Hammond’s Flycatchers, Red-naped Sapsuckers, and Scaly-breasted Munias have also been seen.  The southern terminus of the Marsh Creek Regional Trail begins at the trailhead at the intersection of Concord Ave. and Creek Road in south Brentwood.  A walk north from the trailhead up Creek Road along the riparian corridor of Marsh Creek is quite productive.  Less than ½ mile north of the trailhead, looking through a fence onto a golf-course pond can provide views of several waterfowl species.   A few yards north from here, there is usually water in the creek that many birds come to for bathing and drinking.   Continue along Creek Road, looking over the field to the left for raptors and other fly-bys.  Following this is a section of the road with a lot of toyon and other berry-bearing shrubs where Purple Finches, Cedar Waxwings, Hermit Thrushes, and other frugivorous birds can be found.  Past this, continue along Marsh Creek Trail over the pedestrian bridge spanning the canal, and enter Creekside Park. This park, especially the riparian habitat along the eastern edge, continues to be productive.  Continue along this edge of the park to its end at Crescent Drive.  In the fall and winter of 2020-2021, many observers saw the vagrant Plumbeous Vireo along this section.   This is about a 3 mile, flat, out-and-back roundtrip, and is the southern end of the Marsh Creek Regional Trail System that extends another 8-10 miles all the way to Big Break Regional Shoreline in Oakley.

Upcoming Field Trips

Oct 05

MDAS Field Trip — Elsie Roemer Bird Sanctuary

OCTOBER 5 @ 9:00 AM - 1:00 PM

Elsie Roemer Bird Sanctuary, Alameda Wednesday October 5, 9am – 1pm A visit to the Alameda shoreline as the tide rises should produce good views of shorebirds. A viewing platform and trails will give us excellent opportunities to study these birds at close range. We may drive to other nearby locations for additional birding. Hike Rating:  Category 1 – Easy […]

Alameda CA
Oct 08

MDAS/SMD Field Trip—Curry Canyon

OCTOBER 8 @ 8:00 AM - 12:00 PM

Mount Diablo Audubon Society and Save Mount Diablo are partnering up for a hike on Save Mount Diablo’s gorgeous Curry Canyon Ranch. This portion of Curry Canyon Ranch showcases beautiful rangeland ecosystems and valley oak and riparian habitat. We’ll be looking for fall migrants, arriving wintering birds, and raptors. You might even see a golden […]

Oct 15

MDAS Field Trip — Five Brooks & Bear Valley

OCTOBER 15 @ 9:00 AM - 1:00 PM

Five Brooks/Bear Valley, West Marin County Saturday October 15, 9:00am – 1pm This trip visits two inland areas near Point Reyes, environments of trees and meadows that are miles from the windswept dunes. Five Brooks is a reliable location for California Quail. All sorts of interesting birds show up around the pond at Five Brooks: […]

Bolinas CA
Nov 05

MDAS Field Trip — Palo Alto Baylands/Charleston Slough

NOVEMBER 5 @ 8:30 AM - 2:00 PM

Palo Alto Baylands/Charleston Slough Saturday November 5, 8:30am – 2pm We see a variety of birds on the water on this trip. Locations might include Charleston Slough, Shoreline Lake, Palo Alto Baylands, Alviso and Redwood Shores. Hike Rating: Category 2 – Moderate. We do some walking, but drive from one location to the next. Elevation […]

Mountain View CA
Nov 15

MDAS Field Trip — Shadow Cliffs Regional Park

NOVEMBER 15 @ 8:15 AM - 12:00 PM

Shadow Cliffs Regional Park Tuesday, November 15, 8:15am – Noon Expect to see a good variety of different birds. In years past Bald Eagles, Osprey, Herons, Kingfishers, various ducks; Owls, Hawks, Grackle and many smaller birds have all been seen here. Hike rating: 1 – Easy Elevation change: Minor Leader: Steve Taylor, 925-828-8810 Meet: at […]

Pleasanton CA