South Marble Island Seabirds - Summer Nesting

Hundreds of surf scoters fill the frame on flat water, several are taking flight.

Dozens of seabirds—glaucous-winged gulls, crested puffins, murrelets, loons, and cormorants—congregate over South Marble Island during summer months. This concentration exists because Sitakaday Narrows creates turbulent tidal waters that stir up nutrients and fish, making it a critically productive ecosystem. The island is a sensitive nesting area; observe from your boat and use binoculars to protect breeding colonies. Peak viewing occurs in July.

Access & viewing

GPS Coordinates: 58.646716792226336,-136.04956253519757
Accessibility: Marine-based access required. Sensitive nesting area with mandatory 25-yard wildlife safety distance. Boats only; no landing on island. Binoculars strongly recommended for viewing.

Conditions & safety

Permits Required: 0

Planning advice

Nearby Attractions: Beardslee Islands, Johns Hopkins Glacier, Margerie Glacier, Lamplugh Glacier, Geikie Inlet, Muir Inlet, Harbor Seal viewing areas, Black Bear viewing at Bartlett Cove.
Nearby Facilities: Glacier Bay Visitor Information Station (at Bartlett Cove), Bartlett Cove Campground, Bartlett Cove Public Use Dock, Gustavus Dock & Ferry Terminal.
Best Time To Visit: July during peak nesting season; late May through early September for general visitation
Tips Advice: Binoculars are essential for identifying dozens of seabird species at safe distance.
Look for crested puffins and parakeet auklets among common year-round gulls and loons.
The island is a sensitive nesting area—observe from your boat only to protect breeding birds.
Use a telephoto lens (300mm+) rather than approaching for wildlife photography.
Sitakaday Narrows creates turbulent, nutrient-rich waters—the mechanism driving high seabird concentration.
Check the Glacier Bay bird checklist before your voyage to help identify species in the field.
Insider Tips: Bring quality binoculars—essential for identifying dozens of species at distance.
The distinctive calls of murrelets and loons carry across water; listen as well as watch.
Crested puffins are prized sightings; look for their colorful beaks and stocky profiles.
Sitakaday Narrows turbulence concentrates prey and birds; observe during tidal transitions for maximum activity.
Check the Glacier Bay bird checklist before your voyage—it helps you identify species in the field and track your sightings.
Telephoto lenses (300mm+) recommended for photography without disturbing nesting birds.

More details

Park Area: Upper Bay
Family Friendly Notes: Seabird viewing is family-appropriate with supervision. Emphasize: keep distance from birds, use binoculars rather than approaching, no landing on island. Children enjoy identifying colorful species like puffins. Marine motion may affect younger children; consider seasickness prevention.
Attraction Type: Seabird Nesting Area
Distance From Entrance: Accessible by tour boat from Glacier Bay Visitor Center area; no drive-up access. Most departures from Bartlett Cove.
Accessibility Level: Boat access required; sensitive nesting area enforces 25-yard wildlife safety distance.
How To Get There: Access by boat only. Most visitors use Glacier Bay tour boats departing Bartlett Cove. Private vessels allowed within park regulations. Approximately 50 miles from Gustavus by water.
Parking Availability: N/A - Marine access. Parking available at Bartlett Cove boat launch and ferry terminal.
Road Type: Water-based
Seasonal Access: Accessible year-round, but peak season is late May through early September. July is optimal for seabird nesting activity.
Entry Fees: No entrance fee for Glacier Bay National Park. America the Beautiful annual pass ($80) covers federal recreation sites.
Main Features: Seabird nesting colonies; diverse species including crested puffins, glaucous-winged gulls, murrelets, loons, cormorants, jaegers, and phalaropes.
What Youll See: Dozens of seabird species in nesting and feeding behavior; varied plumage; diving and surface-feeding techniques; island colony structure with visible nesting sites.
Unique Characteristics: Sensitive nesting area for crested puffins; ecosystem productivity driven by Sitakaday Narrows tidal mechanics; hosts both year-round residents and seasonal migrants.
Safety Considerations: Maintain 25-yard distance from wildlife per park regulations. South Marble Island is a sensitive nesting area—do not land. Observe from boats only. Marine conditions typical of Southeast Alaska; fog and sudden weather changes are common. Use proper marine safety equipment. Wildlife remains wild; never attempt approach or hand-feeding.
Best Viewpoints: Observe from your tour boat or private vessel using binoculars; maintain 25-yard minimum distance to avoid disturbing nesting birds.
Photo Opportunities: Seabirds in flight and diving; nesting behavior; colony overviews from boat; individual species portraits with telephoto lens; terns and puffins are particularly photogenic.
Photography Spots: From boat deck: wide-angle shots of island and colony; telephoto (300mm+): individual species in nesting behavior and feeding.
Visitor Center Present: 0
Restrooms Available: 0
Picnic Areas: 0
Interpretive Signs: 0
Water Available: 0
Guided Tours Available: 0
Nearby Services: Gustavus, Alaska (nearest town, ~50 miles south); Bartlett Cove (campground, dock facilities, visitor information).
Common Wildlife: Glaucous-winged gull (year-round resident), crested puffin, parakeet auklet, murrelets, loons, cormorants, jaegers, phalaropes.
Best Wildlife Times: July during peak nesting season; late May through early September for species diversity.
Geological Formation Type: Coastal Ecosystem
Scientific Interest: Seabird monitoring program; ecosystem productivity driven by tidal mechanics of Sitakaday Narrows; migratory species observation; breeding behavior and colony dynamics.
Road Opening Dates: N/A - Water-based access; season depends on tour boat operations (May-September peak).
Winter Access: Winter access possible year-round via boat, but limited. Glaucous-winged gulls remain through winter; species diversity drops significantly. Tour operations may be limited or suspended in winter.
Best Visit Times: Early morning for best light and calm water; mid-day sun reflects off water surface, reducing visibility.
Best Season: Late May through early September; peak July
Weather Patterns: Marine conditions typical to Southeast Alaska; fog, wind, and sudden weather changes common. Afternoon seas may become rough. Extended daylight in summer (nearly 24-hour in July).
Peak Fill Times: N/A - Marine access
Busiest Season: July (peak nesting and visitor season)
Fishing Nearby: 0
Swimming Allowed: 0
Boating Allowed: 1
Climbing Areas: 0
Review Summary: Visitors consistently value South Marble Island as one of Glacier Bay's premier wildlife viewing destinations. The combination of diverse species, visible nesting behavior, and accessible tour options makes it compelling. Many visitors appreciate the emphasis on maintaining safe distance to protect breeding colonies; this is well-communicated and enforced.

Location

Frequently asked questions

Can I land on South Marble Island to get a closer view of the seabirds?

No. South Marble Island is a sensitive nesting area protected to ensure seabirds can breed safely. The 25-yard safety distance is mandatory. Observation from boats with binoculars maintains the ecosystem and protects the birds.

Is it worth taking a boat tour just to see birds?

Yes. Sitakaday Narrows creates turbulent, nutrient-rich waters that concentrate seabird prey. This makes South Marble Island one of Southeast Alaska's most productive seabird ecosystems. You'll see dozens of species in a single visit.

What if I don't see rare species like crested puffins?

You'll definitely see year-round residents like glaucous-winged gulls, loons, and cormorants. Rarer species peak during July nesting season but aren't guaranteed. The Glacier Bay bird checklist helps you identify and appreciate whatever species you do observe.

Do I need special binoculars or camera equipment?

Binoculars are strongly recommended; most details are invisible to the naked eye at safe distance. A telephoto lens (300mm+) is ideal for photography. Without optics, the experience is significantly diminished.

Is July really that much better than other months?

Yes. July is peak nesting season when most species are present and actively breeding. Late May through early September offers good viewing, but July has the highest species diversity and the most visible nesting behavior.

Can I visit in winter?

Yes, year-round water access is possible. Glaucous-winged gulls remain through winter, but species diversity drops dramatically. Peak season (May-September) offers far superior viewing. Tour operations may be limited or suspended in winter.