Swim Across America — Chicago

Swim Across America — Chicago is an open water swimming event held in Lake Michigan at Ohio Street Beach; organized by the non-profit Swim Across America under its motto "Making Waves to Fight Cancer", it raises funds and awareness for clinical research, prevention, and patient support programs. The national organization was founded back in 1987, and its Chicago chapter has deep roots on the lakefront. The local swim debuted in 1994 as a six-mile relay in Lake Michigan that brought together pioneering endurance swimmers and raised $15,000 for oncology research. Over the decades, the swim found its permanent home at Ohio Street Beach, designated by the Chicago Park District as the dedicated long-distance open water swimming corridor for the entire city. Participants take to the lake over a course measuring 1,852 meters—a true nautical mile.

In recent years, the organizers introduced the competitive Miracle Mile format, inviting swimmers to test their race pace directly against the clock. The route runs straight and parallel to the concrete seawall, offering swimmers an astonishing perspective as skyscrapers and urban stone walls glide past just meters away from your stroke.

Ohio Street Beach: the sheltered waters of Lake Michigan

Ohio Street Beach is a unique wedge of shoreline situated along the western edge of Lake Michigan, angled northward into a tucked cove. While the open expanse of Lake Michigan can produce heavy swell and strong chop, this pocket remains well sheltered from incoming lake waves. An extensive system of artificial breakwaters, the barrier of Northerly Island, and the encircling shoreline together frame the inner harbor at the mouth of the Chicago River. Beyond the seawall lies the broader domain of Chicago Harbor, which officially encompasses the public waterways, rivers, canals, and lake surfaces extending three miles out from the city shore. The Chicago Harbor Lighthouse marks the main navigational entry. Across these waters, the Chicago Park District operates a vast municipal harbor network capable of mooring up to 6,000 boats, creating a lively maritime scene.

Ohio Street Beach: a north-facing shore beside the seawall

Ohio Street Beach sits in Chicago's Streeterville neighborhood, next to Jane Addams Memorial Park and the Jardine Water Filtration Plant, and faces directly north. From the beach, swimmers can go north 0.5 miles (800 m) to the Oak Street curve without ever being more than a few feet from the seawall and shallow water. The Jardine Water Purification Plant stands at 1000 East Ohio Street, north of Navy Pier. Ohio Street Beach was formed in the bay created by the Jardine Water Purification Plant.

The mouth of the Chicago River: from sandbar to the river reversal

The inlet where swimmers trace their laps sits just a short distance from an extraordinary hydrologic and urban history. In those early maritime days, nature dictated navigation: in 1803, the trading schooner Tracy found itself unable to enter the Chicago River because a massive sandbar blocked the outlet. In 1831, the river still curved sharply before entering Lake Michigan about half a mile down from Fort Dearborn. That natural configuration began changing in 1855, when workers dredged the south bank to straighten the severe bend and widened the river channel by approximately 150 feet to ease waterborne commerce. The ultimate transformation of these waters occurred between 1936 and 1938 with the construction of the Chicago Harbor Lock.

Built to control water diversion from Lake Michigan and facilitate the legendary engineering feat of reversing the Chicago River's flow away from the lake, the massive chamber measures 600 feet in length, 80 feet in width, and 22 feet in depth. Inside the lock, boats cycle through a water level difference of two to five feet in just 12 to 15 minutes. Today, eight sluice gates actively balance water levels between lake and river for sanitation, navigation, and flood mitigation, making this gate the fourth-busiest commercial lock and second-busiest recreational lock in the United States.

Navy Pier and the historic ships of the harbor

Navy Pier is a monumental promontory resting upon more than 20,000 wooden piles originally imported from Oregon forests and driven deep into the lake bed. During World War II, this enormous lake pier was requisitioned as an active training center for the United States Navy, serving as home dock for the training aircraft carriers USS Wolverine and USS Sable. The deep naval heritage of the site is commemorated at the outer tip of the pier, where visitors can inspect the massive anchor salvaged from the cruiser USS Chicago. Today, the pier remains the primary harbor hub for excursion boats, water taxis, and historic tall ships. Moored right there is the Windy, a striking four-masted traditional schooner. The Windy has the distinction of being the only tall ship currently based and moored in Chicago. {{h2:The urban shoreline: from Ogden Slip to the Chicago Riverwalk}} Built in 1861 by the Chicago Dock and Canal Company following authorization by the United States Department of War, the Ogden Slip runs directly parallel to the North Bank of the Chicago River. Beside it stands the historic Pugh Terminal building erected between 1905 and 1920, and in the mid-1980s urban planners designed a protected visual corridor along the slip to preserve an unbroken sightline toward the iconic Tribune Tower from Lake Shore Drive. The Chicago Riverwalk stretches along the south bank of the main river branch from Lake Michigan all the way to Wolf Point. Near the confluence of the river's branches, the Riverwalk broadens fifty feet into the channel to provide terraced public seating and parkland.

Further down, a section called the Jetty incorporates floating wetland gardens among submerged piers, offering quiet spots for fishing along the current. High above the water, the skyline is anchored by the giant Navy Pier Ferris wheel, engineered to withstand powerful midwestern storms and winds reaching up to 115 miles per hour.