How deep is Port Mansfield?

Port Mansfield reaches a maximum depth of 19.8 metres (65 feet). It is a saltwater site rated as intermediate difficulty. Depths vary across the site, so plan your profile to your training and verify conditions locally.

Is Port Mansfield a shore dive or a boat dive?

Port Mansfield is a boat dive — access is by boat rather than from shore. No facilities are recorded at the site, and cell service is recorded as good. Entry details and parking notes, where known, are listed in the access section of this page.

Can beginners dive Port Mansfield?

Port Mansfield is rated as intermediate difficulty, which may not suit new divers. Listed maximum depth is 19.8 metres (65 feet). Access is by boat. Consider your experience level, conditions, and local guidance before planning.

What will I see at Port Mansfield?

Divers at Port Mansfield in United States commonly report sightings of Juvenile sailfish and Red snapper. Red snapper is recorded as common sightings, while Juvenile sailfish is reported only occasionally. Marine life varies by season and conditions—check the site page for recent diver observations and photos.

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IntermediateBoat entry

Port Mansfield

Texas, United States

20 m (65 ft) depthBoat entry3mm wetsuit typical

Boat dive — see Entry & access.

Port Mansfield at a glance

Port Mansfield is an intermediate boat dive site in Texas, United States with depths of up to 19.8 m (65 ft). Typically most favorable Aug · from 3 years of archive data. Divers commonly see Juvenile sailfish and Red snapper. Recent reports put the water around 26°C (79°F). Check the latest conditions and entry details before you go.

Favorable window now· until 19:00 · sunset 18:51

Forecast for this hour · 17:00 · run 5 h ago

1.0 m (3.4 ft)waves — about a meter expected (waves — about three feet expected)

Tap a factor for its source and model point · Forecast 26°C · seasonal avg 28°C ( · Forecast 79°F · seasonal avg 83°F)

Site hazards: Offshore boat-access site in open Gulf waters; depth of roughly 65 ft places it at recreational depth limits. The associated Liberty Ship Reef nearby is deeper (~90-105 ft), well into advanced/deep-diving range.

Read the full hazards ↓

Dive windows this week

Lightest wind: Sat

Sun

1.0 m waves · 10 kn wind (3.2 ft waves · 10 kn wind)

Mon

0.9 m waves · 8 kn wind (2.8 ft waves · 8 kn wind)

Tue

1.0 m waves · 12 kn wind (3.4 ft waves · 12 kn wind)

Wed

0.8 m waves · 12 kn wind (2.6 ft waves · 12 kn wind)

Thu

1.0 m waves · 13 kn wind (3.3 ft waves · 13 kn wind)

Fri

0.9 m waves · 8 kn wind (3.1 ft waves · 8 kn wind)

Sat

0.7 m waves · 6 kn wind (2.2 ft waves · 6 kn wind)

Favorable windowModerate window— no window

Every forecast dive window each day, site-local time, from wave and wind forecasts. Numbers under each bar are daylight averages.

First light 7:10 · Sunrise 7:33 · Sunset 18:51 · some windows run past sunset

Source: Open-Meteo marine · model point 5.7 km from site · updated 25 Oct, 12:24 GMT-5

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Port Mansfield

Forecast · NOAA tide model

Tide & slack timing

Recent diver reports

Dated firsthand observations from divers — not current conditions.

No diver reports for this site yet. — one dated observation helps every diver after you.

Dived here today — did the forecast match?

Best months, historically

What conditions have historically been typical at this site, month by month — not a forecast.

January, 31% of days have historically been favorable, water has typically been 18°C (64°F), waves have typically been 1.7 m (5.6 ft), wind has typically been 19 knots
February, 49% of days have historically been favorable, water has typically been 18°C (64°F), waves have typically been 1.5 m (4.8 ft), wind has typically been 18 knots
March, 46% of days have historically been favorable, water has typically been 20°C (68°F), waves have typically been 1.5 m (4.8 ft), wind has typically been 18 knots
April, 44% of days have historically been favorable, water has typically been 23°C (73°F), waves have typically been 1.6 m (5.2 ft), wind has typically been 19 knots
May, 55% of days have historically been favorable, water has typically been 26°C (79°F), waves have typically been 1.3 m (4.2 ft), wind has typically been 17 knots
June, 64% of days have historically been favorable, water has typically been 28°C (83°F), waves have typically been 1.3 m (4.2 ft), wind has typically been 17 knots
July, 91% of days have historically been favorable, water has typically been 28°C (83°F), waves have typically been 1.0 m (3.2 ft), wind has typically been 15 knots
August, 95% of days have historically been favorable, water has typically been 29°C (85°F), waves have typically been 0.8 m (2.5 ft), wind has typically been 13 knots, historically most favorable
September, 90% of days have historically been favorable, water has typically been 30°C (86°F), waves have typically been 1.0 m (3.1 ft), wind has typically been 14 knots
October, 58% of days have historically been favorable, water has typically been 28°C (83°F), waves have typically been 1.4 m (4.4 ft), wind has typically been 16 knots
November, 50% of days have historically been favorable, water has typically been 25°C (77°F), waves have typically been 1.5 m (4.9 ft), wind has typically been 18 knots
December, 69% of days have historically been favorable, water has typically been 21°C (71°F), waves have typically been 1.4 m (4.7 ft), wind has typically been 16 knots

August has typically had the largest share of favorable days here. Conditions vary year to year — this is historical context, not a forecast.

Based on 3 years of archive data. Bar height shows the share of days each month whose conditions have historically scored favorably.

Marine life seen at this site

Species noted at this site — not a promise of what you’ll encounter.

Species seen here

Rough labels: “Commonly seen” usually means two or more recorded sightings near this site in public dive logs (GBIF), “Occasionally seen” one; “Seasonal” and “Rarely seen” come from dive-guide research. Not a measured rate.

Fills & rentals nearby

No dive shops mapped within 25 km (16 mi). Know one? Add it to the map.

Data updated June 2026

Site details

Port Mansfield is a Texas Parks & Wildlife artificial reef in the Gulf of Mexico off the South Texas coast, reached by boat from the Port Mansfield jetties. The nearshore reef site, lying in roughly 65-70 feet of water about seven nautical miles offshore, has been built up with thousands of concrete culverts and a sunken tugboat to create durable fish habitat. Deeper waters in the same general area also hold the separate Port Mansfield Liberty Ship Reef, made of three sunken WWII-era Liberty Ships and several oil-platform jackets. The reefs are designed to serve both recreational anglers and divers.

reef

Offshore boat-access site in open Gulf waters; depth of roughly 65 ft places it at recreational depth limits. The associated Liberty Ship Reef nearby is deeper (~90-105 ft), well into advanced/deep-diving range.

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