Michigan / Lake Saint Clair /

St. Johns Marsh Boat Launch

St. Johns Marsh Boat Launch is a public boat ramp on Lake Saint Clair near Pearl Beach, Michigan.

Aerial view of the gravel parking lot with trailers, the channel at the water edge and the highway, August 2022
Aerial view of the gravel parking lot with trailers, the channel at the water edge and the highway, August 2022 Photo: USDA Farm Service Agency, NAIP · Public domain · via USGS The National Map
Zebra mussels

Zebra mussels (latest report 2012) reported in Lake Saint Clair 4.5 km from this launch (USGS Nonindigenous Aquatic Species database). Clean, drain and dry your boat, trailer and gear before you leave, and do not move water, plants or live bait to another water.

USGS Nonindigenous Aquatic Species database · checked October 20, 2026

Status not reported No closure has been posted for this launch, but its agency does not publish open or closed status. Check with the managing agency before you tow.

At the launch

Type
Boat ramp
Coordinates
42.62819, -82.60392

Directions (Google) Apple Maps

Conditions

Marine advisories

Advisories in effect load here; without them, see the NWS zone forecast below.

National Weather Service marine zone LCZ460, Lake St. Clair Open Lake (U.S. Portion). Zone forecast: winds, seas, warnings.

On Lake Saint Clair

Lake St. Clair is a natural freshwater lake on the border between Michigan and Ontario. It is part of the Great Lakes system but is not counted as one of the five Great Lakes. Together with the St. Clair River and the Detroit River, it links Lake Huron to the north with Lake Erie to the south. The lake covers about 430 square miles and is shallow, with an average depth of 11 feet and a maximum depth of 27 feet, according to Wikipedia. Macomb County gives 10 and 21 feet. US and Canadian agencies have kept a 30-foot-deep shipping channel through the lake for more than a century. The St. Clair River enters the lake through a delta of North, Middle and South channels. The North Channel runs past Harsens and Dickinson islands and empties into Anchor Bay. Macomb County has 32 miles of the western shoreline. More about Lake Saint Clair.

Boating rules on Lake Saint Clair

  • St. Clair River (from the mouth of the Black River down to the mouth of the St. Clair River): slow-no-wake within 200 ft of any shore, dock or pierhead for vessels under 26 ft long; within 600 ft for vessels 26 ft or longer (Michigan-enforced) source
  • North (Lac Sainte Claire) and South (Blossom Heath) boat launches in St. Clair Shores are open to St. Clair Shores residents only source

Community

Where people who use Lake Saint Clair talk about it.

Nearby launches

Sources

Why it is listed as public: www.scmbirdtrail.org: There is canoe and kayak access and a boat launch. Something wrong, or is this launch private? Send a correction; it goes to a person.