Blackback land crab (Hartnollius lateralis)

Butler Bay Wrecks

Dive site in the US Virgin Islands. Here's what has been recorded at this site month by month, how the region’s reefs have weathered ocean heat, and how to prepare.

US Virgin Islandswreck
Near this sitegeotagged about 2.3 km from the site coordinates Blackback land crab (Hartnollius lateralis) · Jack Byrley · CC BY 4.0 · iNaturalist
Caribbean bluehead wrasse (Thalassoma bifasciatum)
Chapter I · Arrival

Butler Bay Wrecks: dive site in the US Virgin Islands.

~17.750° N~64.891° W · Wikidata
738open records · GBIF
64species recorded
Near this sitegeotagged about 3.8 km from the site coordinates Caribbean bluehead wrasse (Thalassoma bifasciatum) · Brett/Tele · CC BY 4.0 · iNaturalist
II

Entry

Caribbean bluehead wrasse (Thalassoma bifasciatum)

Shore and boat entries vary by site. We list only rules we can cite from official sources; entry points, depths and currents will be added once we can verify them.

Approximate positionThese coordinates are the position of Butler Bay; the wrecks lie in the bay. Use them for orientation only.
To verifyDepth range, entry points and current notes. We publish them only with a citation. The coordinates mark the site in general, not a mooring or entry point.
Local rules (cited)
  • Buck Island Reef National Monument: scuba diving is allowed only at the two designated scuba moorings in the north lagoon, not on the underwater trail. Do not stand on or handle corals. NPS · Buck Island Reef NM
  • Buck Island: private boats may anchor only in the anchorage area off West Beach. NPS · Buck Island Reef NM

Near this sitegeotagged about 3.8 km from the site coordinates Caribbean bluehead wrasse (Thalassoma bifasciatum) · Brett/Tele · CC BY 4.0 · iNaturalist

Blackback land crab (Hartnollius lateralis)
Open media · Near this sitegeotagged about 2.3 km from the site coordinates Blackback land crab (Hartnollius lateralis) · Jack Byrley · CC BY 4.0 · iNaturalist

The surface noise falls away.

Reds go first. The world turns blue-green.

Then Butler Bay Wrecks rises to meet you.

Blackback land crab (Hartnollius lateralis)
IV

What lives here, by month

Pick a month. These are the species most often recorded within about a kilometre in that month, from open survey records.

Oct
October · 0 qualifying records
Life calendar · records per month for this site's most-recorded species (blank means not in that month's top list)
SpeciesJanFebMarAprMayJunJulAugSepOctNovDec
Mustard Hill Coral
Great Star Coral
Bumpy star coral
Massive Starlet Coral
Lettuce Coral
Boulder star coral
Blushing Star Coral
Common Lionfish
Ten-ray Star Coral
Finger Coral
Lamarck's sheet coral
Maze Coral

Most-recorded species, all months

  1. Mustard Hill Coral (25)
  2. Great Star Coral (20)
  3. Bumpy star coral (18)
  4. Massive Starlet Coral (16)
  5. Lettuce Coral (15)
  6. Boulder star coral (15)
  7. Blushing Star Coral (14)
  8. Common Lionfish (13)
  9. Ten-ray Star Coral (11)
  10. Finger Coral (9)
  11. Lamarck's sheet coral (7)
  12. Maze Coral (6)
  13. Symmetrical brain coral (6)
  14. Lowrelief Lettuce Coral (5)
  15. Boulder star coral (5)
  16. Lesser Starlet Coral (4)
  17. Grooved brain coral (3)
  18. Pagurus marshi (2)
  19. Smooth Star Coral (2)
  20. Thin Finger Coral (2)

GBIF.org (2026-10-15), occurrence records within ~1 km, licensed CC0 or CC BY 4.0 only. Birds and land animals are excluded. Counts reflect survey effort, not abundance. 738 qualifying records. See them on GBIF. Common names: Wikidata (CC0) / GBIF. Species photos: Wikimedia Commons, credited with each species.

V

Forty-one summers of heat

Each stripe is one year since 1985, colored by its peak heat stress across NOAA's “Virgin Islands” region. These are NOAA Coral Reef Watch satellite figures for the whole region, not for this one site.

19852026
Reef health report · Virgin Islands

Heat stress, measured from orbit.

Degree Heating Weeks · 2026-10-139.5°C-weeks · NOAA status: Alert Level 2

NOAA CRW virtual station “Virgin Islands”. NOAA's alert thresholds are 4 °C-weeks (Alert Level 1) and 8 °C-weeks (Alert Level 2). Station page · Method. Credit: NOAA Coral Reef Watch.

Peak per year · dashed lines at 4, 8 and 16 °C-weeks
The past twelve months
VI

Conditions

Average sea temperature through the year. Check the live readings before you go.

Average sea surface temperature by month: NOAA CRW “Virgin Islands” station climatology (monthly means).

Buoy readings are measurements; forecasts are models. Use them for planning only, and assess conditions on site. Depth and visibility data aren't listed until we can cite a source.

VII

Plan & prepare

  1. Read the official marine forecast the night before.Offshore, wind and sea state decide the day.
  2. Check the cited local rules above and pay any park fee before you dive.[Placeholder: verified operator list to come]
  3. Study this month's species above.You'll recognise more when you know the names.
  4. Hands off, fins up, buoyancy dialled. Log what you see.Your sightings can become tomorrow's open data.

Credits

Coordinates
Wikidata Q31886591 (CC0) · position of Butler Bay; the wrecks lie in the bay. Wikidata (CC0), mostly from US Geological Survey place names, plus one OpenStreetMap (ODbL) reef. Several use the named bay, cay or island, so treat them as approximate.
Species records
GBIF.org, CC0 & CC BY 4.0 records. By license: CC_BY_4_0: 546, CC0_1_0: 192
Dataset
EOD – eBird Observation Dataset · doi:10.15468/aomfnb (353 records) · GBIF
Dataset
NOAA National Coral Reef Monitoring Program Coral Demographic Data · doi:10.7289/v5vd6wts (140 records) · GBIF
Dataset
NOAA, Deep-Sea Coral Research and Technology Program · doi:10.15468/aqbftj (76 records) · GBIF
Dataset
CAS Herpetology (HERP) · doi:10.15468/bvoyqy (55 records) · GBIF
Dataset
NOAA National Coral Reef Monitoring Program Coral Benthic Assessment Data · doi:10.7289/v5vd6wts (47 records) · GBIF
Dataset
USGS Marine Fishes of St. Croix and U.S. Virgin Islands · doi:10.15468/fbpxvo (36 records) · GBIF
Dataset
USGS Nonindigenous Aquatic Species database · doi:10.15468/ijccz9 (12 records) · GBIF
Dataset
Delaware Museum of Nature and Science – Mollusks · doi:10.15468/lfwzak (4 records) · GBIF
Query
https://api.gbif.org/v1/occurrence/search?decimalLatitude=17.74,17.76&decimalLongitude=-64.90138900000001,-64.881389&license=CC0_1_0&license=CC_BY_4_0&taxonKey=44&taxonKey=206&taxonKey=229&taxonKey=136&taxonKey=225&occurrenceStatus=PRESENT&limit=0
Heat stress & SST
NOAA Coral Reef Watch, 5 km Regional Virtual Station “Virgin Islands”
Hero photo
Near this sitegeotagged about 2.3 km from the site coordinates Blackback land crab (Hartnollius lateralis) · Jack Byrley · CC BY 4.0 · iNaturalist
Arrival photo
Near this sitegeotagged about 3.8 km from the site coordinates Caribbean bluehead wrasse (Thalassoma bifasciatum) · Brett/Tele · CC BY 4.0 · iNaturalist
Gallery
7 photos, credited under each image
Species photos
Wikimedia Commons, credited with each species. Full list: Data & sources