Sarnia webcam — Marysville: live stream across the St. Clair River
Sarnia and Marysville: Two Shores of One River
This webcam is installed on the Canadian shore of the St. Clair River and faces the American city of Marysville, Michigan. Sarnia is located on the eastern shore of the confluence of the Upper and Lower Great Lakes, where Lake Huron flows into the St. Clair River, forming the border between Canada and the United States. This is one of the busiest border zones between the two countries.
The St. Clair River is a waterway 65 km (40.5 miles) long in the Great Lakes system, which serves as the border between the US and Canada along its entire length. It flows from Lake Huron into Lake St. Clair, forming part of the international boundary between Ontario province and Michigan state.
Blue Water Bridge: Link Between Two Countries
The region's main transportation artery is the two-span international Blue Water Bridge across the St. Clair River, connecting Port Huron, Michigan and Point Edward, Ontario. The bridge links Highway 402 in Ontario with Interstate highways I-69 and I-94.
The original Blue Water Bridge was officially opened on October 8, 1938. Together, the two spans connect Chicago and the US Midwest with Toronto and the US Northeast, serving as one of the four shortest land routes between the Midwest and the Northeast. The Blue Water Bridge in Sarnia became the busiest trade corridor between Canada and the US as of 2025, surpassing Windsor due to higher tolls on the Ambassador Bridge and delays in opening the Gordie Howe Bridge.
Marysville: The American Shore
Marysville is a city in St. Clair County, Michigan. According to the 2020 census, the population was 9,997 people. The municipality was founded in 1919 first as a village, then became a city in 1924.
Marysville is located on the shore of the St. Clair River, opposite the Canadian city of Sarnia, and is part of the region known as the "Blue Water Area." The city was previously home to the Wills Sainte Claire Automotive company, a Morton Salt plant, and the Detroit Edison Marysville Power Plant, which was decommissioned in 2001 and demolished in 2015.
Chemical Valley: The Industrial Heart of the Region
Sarnia and its surroundings are known as Chemical Valley — one of the largest industrial clusters in Canada. The Blue Water settlement was built to house workers and their families in Chemical Valley during the construction of Polymer Corporation; at its peak it had nearly 3,000 residents. In 1961, all residents were relocated, mostly to the North area.
The Aamjiwnaang First Nation reservation borders Sarnia's chemical plants, raising concerns among environmentalists and local residents about pollution. Indigenous peoples have gathered at this location for millennia, where Lake Huron flows into the St. Clair River.
Water Transport and Cruise Ships
The St. Clair River is an important navigable waterway in the Great Lakes system. Both cargo vessels carrying iron ore, coal, and grain, as well as passenger cruise ships pass through here. A large Viking cruise line ship can be seen on the river's waterway on the camera.
Downstream from the Blue Water Bridge on the St. Clair River is the St. Clair Tunnel. Ferries also operate between the riverbanks, providing passenger service between Canada and the US.
Border Symbolism: Three Flags
Three flags are installed in the foreground of the camera: the flag of the United States of America, the flag of Canada, and the flag of Michigan. This composition symbolizes the unique location — on the border of two countries, where each side maintains its identity while together forming a single border space.
The Michigan flag with the state coat of arms on a blue background is a rare element in border locations, emphasizing the local identity of the American shore.
Climate and Weather in the Region
The Sarnia and Marysville region lies in a zone of temperate continental climate with pronounced Great Lakes influence. Winters here are milder than in the interior of the continent due to the thermal influence of Lake Huron. Summers are warm and humid, with frequent thunderstorms.
The St. Clair River does not freeze completely every year, but ice formation is possible in cold winters. In spring and autumn, fog is common on the river, especially in the morning hours.
What You Can See on the Camera
The online camera in Sarnia broadcasts a view of the St. Clair River with the American shore — the city of Marysville, Michigan. Three flags are installed in the foreground: the flag of the United States of America, the flag of Canada, and the flag of Michigan. A large Viking cruise line ship is visible on the waterway. In the background — the water surface of the St. Clair River and the sky with clouds. The scene represents a border port area on the US-Canada border with a view of water transport.
