United States Dive Sites — Page 26

Showing 601–624 of 1,024

Continued from the United States dive sites guide, which covers regions, seasonality, and planning details.

Manasquan Inlet - Captain Frank Rose Wreck

New Jersey · 19.8–22.9 m

Artificial reef built from 85' Trawler - "Mt.Sinai" NJDEP deployment record: Ship, material: 85' Trawler - "Mt.Sinai", deployed 2017.

IntermediateBoat entry

Manasquan Inlet - Geiges Memorial Reef

New Jersey · 19.8–22.9 m

Artificial reef built from 65 foot tug boat-"RANGER" NJDEP deployment record: Ship, material: 65 foot tug boat-"RANGER", deployed 2021.

IntermediateBoat entry

Marina Del Rey 1 Center

California · Up to 19.8 m

Artificial reef built from Quarry Rock

IntermediateBoat entry

A shallow reef shore dive off the southern end of La Jolla Shores in front of the Marine Room restaurant, a quieter alternative to the main Shores entry. Known for green sea turtles, leopard sharks in the early summer months, and stingrays on the sandy bottom. Coordinates estimated just offshore of the named landmark.

Shore entry

Mariner 1

Florida · Up to 38.1 m

Artificial reef built from 170' Long Dutch Freighter, the "Union Express"

AdvancedBoat entry

Marquette Wreck

Wisconsin · Up to 66 m

The wooden steamer Marquette (1881) foundered in 1903 while trying to reach Michigan Island and lies in 215 ft of Lake Superior water about five miles east of the island. Its superstructure tore free in the sinking; the hull is progressively broken from the nearly intact bow to the stern, with an upright engine and propeller, much of it covered in iron ore cargo. Located in 2004 and documented in 2006 by GLSPS divers — an extremely cold, remote trimix dive for expert teams only.

ExpertBoat entry

Mary Alice B Wreck (Sanilac Shores Underwater Preserve)

Michigan · 25.9–29 m

The Mary Alice B is a 62-ft steel tug built in 1931 for the Army Corps of Engineers (originally named Quintus) that foundered off Port Sanilac in September 1975 and was located in 1992. She sits upright and remarkably intact in about 92-95 ft of Lake Huron within the Sanilac Shores Underwater Preserve. The pilothouse, with the wheel still in place, offers a swim-through for trained divers, though silt is easily disturbed inside.

AdvancedBoat entry

Matagorda

Texas · Up to 18.3 m

The Matagorda Nearshore Reef (TPWD site BA-439) is a 160-acre artificial reef in Texas state waters of the Gulf of Mexico, roughly 10 miles off the Matagorda County coast. Built under the Texas Parks and Wildlife Artificial Reef Program with Deepwater Horizon restoration funds, it consists of three-sided concrete pyramids (8 ft tall, 10 ft bases) placed on sandy bottom in about 60 feet of water. The structures were deployed to create hard-bottom habitat for Gulf marine life and to give anglers and divers an accessible nearshore destination, part of the largest nearshore reefing effort in the program's history.

IntermediateBoat entry

Matagorda Island Liberty Ship

Texas · Up to 32.6 m

A dive site in United States. The site reaches a maximum depth of about 33 m. The site is reached by boat. Rated advanced based on available data.

AdvancedBoat entry

Matinecock Reef

New York · 9.1–12.2 m

Matinecock Reef is a 41-acre NYSDEC artificial reef in Long Island Sound about 0.5 nautical miles north of Peacock Point, in 30-40 ft of water. Built from a barge and seven pontoons with concrete slabs added in 2025, it provides moderate relief for tautog, black sea bass and scup. Visibility is typically 10-20 ft and tide-dependent—an intermediate Sound boat dive.

IntermediateBoat entry

Mattituck

New York · 21.9–30.5 m

Mattituck Reef is a 50-acre NYSDEC artificial reef in Long Island Sound about 2.37 nautical miles northwest of Mattituck Inlet, in 72-100 ft of water. It holds a sunken vessel and concrete buoy sinkers and is one of the deeper Sound reefs, making it an advanced/deep boat dive. Black sea bass, tautog and scup gather on the structure; visibility is variable.

AdvancedBoat entry

Maunalua Bay Artificial Reef - Corner C

Hawaii · Up to 21.6 m

A dive site in United States. The site reaches a maximum depth of about 22 m. The site is reached by boat.

IntermediateBoat entry

Maunalua Bay Artificial Reef - Mud Scow Barge

Hawaii · Up to 26.5 m

A dive site in United States. The site reaches a maximum depth of about 27 m. The site is reached by boat. Rated intermediate based on available data.

IntermediateBoat entry

May Flower (shipwreck)

Minnesota · 24–27 m

The May Flower was a 147-foot wooden scow-schooner that capsized and sank on June 2, 1891 while carrying sandstone blocks, drowning two of her crew. Found in 1991, she lies in about 90 feet of water roughly four miles east of the Duluth harbor entry near the Lester River, with an intact bow and stern, two kedge anchors and Minnesota's only known manual ratcheted windlass of its type; the midsection is broken and sand-buried. It is a boat-only dive with typically modest visibility, best in autumn, and was listed on the National Register of Historic Places in 2012.

AdvancedBoat entry

McAbee Beach

California · 3–13.7 m

A small pocket beach on Cannery Row next to the El Torito restaurant, diving over historic cannery debris and a healthy kelp forest. Lengths of old pipe run from near shore out to about 40 feet and serve as navigation aids, and McAbee Pinnacle lies offshore. An easy, protected entry popular for relaxed kelp dives close to downtown Monterey.

Shore entry

McAllister Grounds

New York · 14.6–16.2 m

McAllister Grounds (Fishing Line) Reef is a 425-acre NYSDEC artificial reef in the Atlantic Ocean about 2.8 nautical miles south of Long Beach, in 48-53 ft of water. Despite its 'fishing line' name it is a developed reef built from vessels, barges, scow pieces, steel miter/dam gates, a turbine, rock and concrete forms, with concrete blocks/forms added in 2025. It supports black sea bass, tautog and scup; visibility is typically 10-20 ft—an intermediate Atlantic boat dive.

IntermediateBoat entry

McKinney Park / Clark Point, Lake Winnipesaukee

New Hampshire · 3–32 m

The best-known shore dive on Lake Winnipesaukee, entered from the small town McKinney Park at the end of Clark Road in Wolfeboro. A shallow rocky training area gives way to huge boulder formations around 30 feet, and at about 45 feet a freshwater wall drops to 90 feet with a maximum depth around 105 feet and a small cavern at its base. Coarse sand keeps visibility up to about 25 feet on good days.

IntermediateShore entry

Meeks Bay

California · 3–45.7 m

Meeks Bay, on Lake Tahoe's west shore about 5 miles north of Emerald Bay, is one of the lake's most popular and family-friendly shore dives, with easy beach entry from the resort or campground and visibility that can exceed 60 ft. The mostly shallow bay slopes gradually before dropping at about 45 degrees into deep water, with rocky ledges and outcroppings on the south side that shelter fish and abundant crawfish, plus a sunken motorboat at around 90 ft. At ~6,225 ft elevation it is an altitude dive in cold water year-round.

IntermediateShore entry

Memorial Stadium (South end)

Maryland · Up to 7 m

Artificial reef built from Reefballs, rubble

Boat entry

Mercedes

Florida · Up to 29.6 m

Artificial reef built from 197' Steel Freighter, the "Mercedes"

IntermediateBoat entry

Meridian Wreck

Wisconsin · Up to 12.2 m

The two-masted schooner Meridian (1848), a veteran of Wisconsin's lumber trade, was lost in an October 1873 storm and lies broken into three major sections in about 40 ft of water near the Strawberry Islands off Fish Creek. The 105-ft main section includes an almost intact bow and port side, with the stempost base at 39 ft. Surveyed by the Wisconsin Historical Society and covered by a WHS dive guide slate; NRHP-listed in 1996.

Boat entry

Mermet Springs

Illinois · 4.6–36.6 m

Mermet Springs is a spring-fed former rock quarry of about 8.5 acres near Belknap in far southern Illinois, and one of the most famous inland dive sites in the country. Its signature attraction is the Boeing 727 used in the film 'U.S. Marshals,' resting with its tail at 15 feet and nose at 50 feet and open for trained divers to swim through, alongside many other sunken vehicles and training platforms. The quarry reaches about 120 feet deep and is run as a full-service commercial dive park.

AdvancedShore entry

Metridium Fields

California · 9.1–18.3 m

A field of rocky reefs offshore of Cannery Row covered in giant white plumose anemones (Metridium farcimen), one of Monterey's signature dives. Divers navigate from shore by following a 30-inch steel pipe that runs seaward from the gray pump house to about 40-45 feet, then swim due north roughly 60-100 feet to the main reef. A classic navigation-practice dive over mostly sandy bottom.

IntermediateShore entry

MG-111 Barge

Florida · Up to 18.3 m

Artificial reef built from 195' Hopper Barge "MG11", with 1,000 tons of Concrete

IntermediateBoat entry