Every third Saturday from October through March, a handful of people gather at the Dragonfly Ramada inside the Riparian Preserve at Water Ranch before eight in the morning. A volunteer from Desert Rivers Audubon Society hands out binoculars, no charge, no reservation required, and the group splits into small clusters to walk the ponds. It has worked this way for years. What is different this fall is what happens after the walk ends: some of what these volunteers see now feeds into a piece of equipment most walkers never notice, mounted quietly on-site, that connects this 110-acre patch of Gilbert to a tracking network spanning the hemisphere.
That equipment is a Motus Wildlife Tracking Tower, installed at the preserve as the first urban Motus station in Arizona. Motus works by detecting radio tags attached to migrating birds, bats, and even large insects as they pass within range of an antenna. The data gets logged automatically and pooled into a public database managed by Birds Canada, the kind of infrastructure usually associated with remote research stations, not a wetland tucked behind a public library in the East Valley. Gilbert's own parks staff describe the payoff plainly: the preserve gives scientists a way to see where tagged birds actually go after they leave, rather than guessing from sightings alone.
The number that flips the season most people assume is best
Ask a casual visitor when Water Ranch is at its best and most will say winter, when Arizona's mild weather draws people outside and the ponds fill with wintering ducks. The count data says otherwise. Across the preserve's wetland complexes, shorebird numbers peak at roughly 1,100 birds on a single day during spring and fall migration. Winter tops out closer to 800. The preserve is not just pleasant in October and November. It is measurably busier with birds than it is in January.
That gap matters because fall migration is short and specific. The species showing up in the heaviest concentrations right now are Long-billed Dowitcher, Least Sandpiper, and Black-necked Stilt, all working the shallow edges of the seven ponds where water levels shift day to day depending on recharge operations. Peregrine Falcons show up regularly during the migration window too, cutting through the airspace above the wetlands where shorebirds concentrate. American Kestrel and Loggerhead Shrike use the site as well, and Burrowing Owls nest in burrows installed specifically for them at the Water Ranch site, a detail that separates this preserve from a generic desert park: some of the habitat here was built on purpose, not left over.
What the walk actually looks like
The Family Bird Walks meet at the Dragonfly Ramada and run from 8 a.m. to noon, and Desert Rivers Audubon supplies binoculars for anyone who shows up without a pair. Volunteers break attendees into smaller groups so an experienced birder can point out what is moving through the reeds without a crowd scaring it off. No experience is required and no cost is attached. The preserve sits at 2757 East Guadalupe Road, and overflow parking runs through the Southeast Regional Library next door when the main lot fills, which it tends to do on walk mornings.
For a different kind of visit, the preserve runs a Night Hike on October 9, 2026, a roughly one-mile guided walk after dark focused on nocturnal wildlife rather than migratory birds. Staff lead visitors through the preserve looking for scorpions, owls, and bats, and the logistics are specific: closed-toe shoes, a headlamp with a red-light setting so the beam does not disrupt nocturnal animals, and no pets. It is a shorter, quieter program than the daytime walks, and it treats the same acreage as a different kind of habitat once the sun drops.
Anyone who wants to stretch a preserve visit into a full day has a third option most people connect to a different park entirely. The Gilbert Rotary Centennial Observatory sits inside the same preserve boundary, run by the East Valley Astronomy Club, and opens most Saturday evenings from sunset until 9:30 p.m. for public stargazing through a solar telescope and a computer-controlled 16-inch Meade telescope, weather permitting. A morning bird walk and an evening at the observatory bookend the same 110 acres without repeating a single activity.
Why the tracking tower changes what a sighting means
A birder who spots a tagged Peregrine Falcon at Water Ranch used to just have a good morning. Now that sighting can register on an antenna and become a data point in a system tracking that same bird's movement across state lines, feeding researchers who study where migration routes are weakening or holding up. Desert Rivers Audubon's Rebecca Stephenson put the shift in plain terms, noting that Motus technology finally lets researchers start connecting the dots on journeys that have long been difficult to study directly. Gilbert's own parks staff frame it as a reminder that a local preserve plays a role in something considerably larger than the town itself.
That framing is not an exaggeration built for a blog post. The Water Ranch site sits within the Gilbert Riparian Preserves Important Bird Area, a designation from the National Audubon Society and Birdlife International that put this patch of the East Valley on the same list as far larger and more remote wildlife areas across the state. More than 300 bird species have been documented here since the preserve's development in 1999, and the shorebird diversity alone runs to 14 species using the wetland basins. A Motus station does not create that ecological value. It just makes it visible to people who are not standing at the ramada with binoculars in hand.
What this means for the next six months
Fall migration does not last indefinitely, and the current concentration of shorebirds moving through the ponds will thin out as the season turns toward winter's steadier, lower numbers. The walks continue on their third-Saturday schedule straight through March, which means anyone who misses this month's session gets another shot, but the specific birds moving through right now, the ones drawing that 1,100-count peak, are passing through on their own timeline, not the walk's. Water levels in the seven ponds change basin by basin, sometimes daily, depending on recharge operations, so which pond is worth checking shifts along with them. Longtime visitors know to check more than one basin on the same trip rather than assuming last month's hot spot is still active.
None of this requires special equipment beyond what Desert Rivers Audubon already provides at the ramada. What it requires is showing up during the window when the preserve is doing the thing it was actually built for: filling with treated water that recharges the aquifer while doubling as a stopover for birds working their way across a continent, one antenna ping at a time.
If Water Ranch has you thinking about what else in Gilbert rewards a closer look, the team at Mike Steck spends as much time walking these neighborhoods as researching them, and we're always glad to talk local favorites, birding included.
