NBM Dive Site Resource
Washington
Lake Ontario, New York, United States
TECHNICAL DIVE ONLY — Washington is an exceptionally intact late-18th-century Lake Ontario sloop resting in approximately 250 ft / 76 m. NOAA classifies the site as technical diving; this depth requires advanced technical and decompression training.
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Historic Picture Placeholder
Aquatic life at this dive site
What divers may encounter
Three reviewed connections are featured here. Sightings vary by season, conditions, and chance, so they are never guaranteed.
Aquatic life research in progress
NBM is reviewing a likely local species for this position.
Aquatic life research in progress
NBM is reviewing a likely local species for this position.
Aquatic life research in progress
NBM is reviewing a likely local species for this position.
Site media
Photographs
Three views rotate from the published gallery on each visit.
Contributor media
Dive videos
Three featured video positions are reserved on every profile.Recent field observations
Diver-reported temperatures
Automatically checked observations from dives during the past 14 days. Three reports are visible at a time; scroll for more.A report that passes the automatic checks will appear here with the dive date, diver’s display name, and temperatures at each depth.
Reports are automatically checked for plausible dates, depths, and temperatures. They are observations, not forecasts; confirm conditions before diving.
Seasonal planning reference
Typical monthly conditions
Long-term averages, not a forecast. Actual air and water conditions can change quickly and may vary across the site.Moderate-confidence match — Matched by documented Great Lakes port/area. Air and surface-water values are regional planning averages. No bottom-water line is published because a comparable depth-specific record has not yet been verified.
| Month | Average air | Surface water | Bottom water | Bottom measurement depth |
|---|---|---|---|---|
| Jan | 26.2°F / -3.2°C | 34.9°F / 1.6°C | No reliable record | — |
| Feb | 27.4°F / -2.6°C | 34.0°F / 1.1°C | No reliable record | — |
| Mar | 35.2°F / 1.8°C | 43.6°F / 6.4°C | No reliable record | — |
| Apr | 46.8°F / 8.2°C | 39.0°F / 3.9°C | No reliable record | — |
| May | 58.8°F / 14.9°C | 44.0°F / 6.7°C | No reliable record | — |
| Jun | 67.6°F / 19.8°C | 56.0°F / 13.3°C | No reliable record | — |
| Jul | 72.3°F / 22.4°C | 69.8°F / 21.0°C | No reliable record | — |
| Aug | 70.7°F / 21.5°C | 72.6°F / 22.6°C | No reliable record | — |
| Sep | 63.6°F / 17.6°C | 68.4°F / 20.2°C | No reliable record | — |
| Oct | 52.2°F / 11.2°C | 59.0°F / 15.0°C | No reliable record | — |
| Nov | 41.5°F / 5.3°C | 50.3°F / 10.2°C | No reliable record | — |
| Dec | 32.0°F / 0.0°C | 44.5°F / 6.9°C | No reliable record | — |
NOAA NCEI 1991–2020 U.S. Climate Normals — Rochester, NY
1991–2020 climate normalsReview source ↗NOAA NCEI Coastal Water Temperature Guide — East Lake Ontario
Historical monthly station averagesReview source ↗Bottom temperature is never inferred from surface temperature. A blank month means no reliable depth-specific average is available. Data reviewed 2026-08-26.
Why divers know this place
Highlights
Rare 1797-built sloop with hull, bowsprit and standing mast exceptionally preserved in Lake Ontario.
Shipwreck-only module
The wreck
This section appears only on shipwreck records and brings the vessel, its loss, present condition, access, and responsible wreck-diving considerations into one place.
- Vessel type
- Single-masted sloop
- Vessel length
- 53 feet
Regional context
Located within
Before you arrive
Access notes
Extreme-depth technical dive only. Confirm legal access, current conditions, gas and decompression plans and operator requirements. The stored profile does not present the position as a navigation waypoint.
Plan within your training
Conditions and hazards
Extreme depth, major decompression obligations, cold water, darkness, limited visibility, entanglement, fragile historic structure and possible overheads. Penetration requires separate training and a site-specific plan.
Independent resource notice
This record is a starting point for independent verification. Access, closures, moorings, weather, currents, depth, visibility, operator availability, and site conditions can change without notice. Confirm current information with the responsible operator, property owner, managing authority, or another qualified local source before planning or attempting a dive.