Birds of San Juan's Lagoons: San José, Torrecilla, Condado, Martín Peña

San José and Los Corozos lagoons

At the center of the estuary, between San Juan and Carolina, lie Los Corozos Lagoon to the northwest and San José Lagoon to the southeast, with about 1,129 acres of water. They have no direct outlet to the sea, which makes them the least tidal. Most of their shoreline is fringed with mangroves, although the western and southwestern banks were filled for housing.

In the eBird and iNaturalist data aggregated by GBIF, Great Egret is the most-reported heron around San José, followed by Cattle Egret, Green Heron, Snowy Egret, Little Blue Heron, Yellow-crowned Night Heron, and Tricolored Heron. Over the water, Brown Pelican and Magnificent Frigatebird are frequent, and Common Gallinule works the vegetated edges. White and Glossy Ibis turn up occasionally.

Martín Peña Channel: the channel reopening

The Martín Peña Channel runs about 6 km and links San Juan Bay with San José Lagoon. Its average depth was only about 1.2 m, and for decades fill, debris, and sediment limited water exchange. Its western half, dredged and lined with mangroves, has a boardwalk: the Parque Central boardwalk, where Little Blue Heron is seen regularly.

In May 2026 dredging and channelization of the channel began, a project scheduled through 2029 that aims to reconnect San José Lagoon with the bay and reduce flooding in neighboring communities. For birds, more water circulation can mean changes in fish, mudflats, and shorelines. If you visit, respect the work zones and the communities that pushed for the restoration.

La Torrecilla Lagoon and Suárez Canal

Suárez Canal, about 3.9 km long and lined with forest, joins San José Lagoon with La Torrecilla. This lagoon covers about 608 acres, is mostly ringed by mangroves, and opens to the Atlantic through the narrow Boca de Cangrejos. Together with Piñones and the Vacía Talega and Torrecilla Alta area, it holds about 5,493 acres of mangroves and 5,079 acres of herbaceous wetlands.

Because it connects to the sea, Torrecilla is the sector with the most seabird and fish-eating bird records in GBIF: Brown Pelican, Magnificent Frigatebird, and Osprey are reported there very often, along with Belted Kingfisher. Among herons, Great Egret leads, followed by Green Heron, Little Blue Heron, and Snowy Egret, and Clapper Rail sometimes shows in the mangroves.

Condado Lagoon: a reserve among hotels

Condado Lagoon covers about 102 acres, with an ocean outlet at El Boquerón and a small beach heavily used by swimmers and paddlers. The estuary plan describes it as one of the most diverse areas of the system for marine flora and fauna. Law 112 of 2013 designated it an Estuarine Nature Reserve, co-managed by the DNER, the San Juan Bay Estuary, and the Municipality of San Juan.

For birders, Condado offers big birds at close range. In GBIF, Great Blue Heron is the most-reported heron on the lagoon, mostly in winter months, followed by Green Heron, Little Blue Heron, and Great Egret. Brown Pelican and Magnificent Frigatebird are frequent. Because it is a busy urban lagoon, arrive early, before the kayak and boat traffic.

Birds of concern and lost mudflats

The estuary plan lists Brown Pelican, Magnificent Frigatebird, Reddish Egret, West Indian Whistling-Duck, Caribbean Coot, White-crowned Pigeon, and Yellow-shouldered Blackbird among its critical elements, along with other birds. Today the DNER lists Brown Pelican as endangered and Magnificent Frigatebird as vulnerable. Watching pelicans plunge-dive at Torrecilla or Condado is part of the experience, and also a reminder of their status.

The estuary has lost valuable habitat. Until the late 1980s, the Constitution Bridge mudflats at the mouth of the Martín Peña Channel were considered to hold the most diverse and abundant bird population in Puerto Rico relative to their size. They were destroyed by dredging for the Aqua-Expreso ferry, and the mitigation mudflats created nearby were gone by 1996 because of the Río Puerto Nuevo flood-control project. Isolated mudflats remain in the channel and along the edges of Torrecilla and Piñones.

How to bird the lagoons

The best hours are the first of the morning, with less heat, less traffic, and more activity. Bring binoculars and, if you can, a spotting scope to scan distant shores. Count herons by species and note the tide at Torrecilla and Condado, where seawater flows in and out; at San José the tide has little effect, so water level depends more on rain.

Use public access points and busy areas, leave nothing visible in your vehicle, and do not enter mangrove roots or private property. If you kayak, keep your distance from roosts and nests and never chase birds. Your eBird checklists, with counts and times, help measure how the estuary's birds change, especially now that the Martín Peña dredging will transform water circulation.

What birds live at San José Lagoon?

Mainly herons: Great Egret is the most reported, along with Cattle Egret, Green Heron, Snowy Egret, Little Blue Heron, Yellow-crowned Night Heron, and Tricolored Heron. Brown Pelican, Magnificent Frigatebird, and Common Gallinule are also frequent.

How many bird species are in the San Juan Bay Estuary?

The San Juan Bay Estuary plan reports more than 160 bird species within the system. Counting the San Juan area from Caimito to Ocean Park and Old San Juan, eBird totals 221 species, according to the Estuary program.

Which lagoons make up the San Juan Bay Estuary?

Condado Lagoon, the San José and Los Corozos lagoons, La Torrecilla Lagoon, and Piñones Lagoon, plus the bay itself. They are joined by the Martín Peña Channel, San Antonio Channel, and Suárez Canal.

Are there pelicans at Condado Lagoon?

Yes. Brown Pelican is frequent at Condado and Torrecilla, along with Magnificent Frigatebird. The DNER lists Brown Pelican as endangered, so watch it without approaching its perches.

How will the Martín Peña dredging affect birds?

Dredging began in May 2026 and is scheduled through 2029; it aims to reconnect San José Lagoon with the bay. More water circulation may change fish, mudflats, and shorelines, so bird counts before, during, and after the project will be valuable.

Where can I see herons in San Juan?

The Parque Central boardwalk on Martín Peña Channel is regular for Little Blue Heron; the San José and Torrecilla shorelines have the widest variety; and Condado is good for Great Blue Heron in winter.