The Cuyahoga River caught fire at least thirteen times before 1969, and the last blaze helped push the Clean Water Act through Congress three years later. That river is the one guests now board a boat to see. Cleveland Metroparks was chartered in 1917 as a ring of reservations around the city, a green belt its early planners called the Emerald Necklace. For most of the twentieth century the system faced outward, toward the Rocky River and Chagrin valleys. The industrial river at the centre was left to shipbuilders, ore docks and the lake freighters that fed the mills. That changed in 2013, when the park district took over the lakefront reservations from the state, and again in the years after, when Merwin Avenue in the Flats became a working park frontage rather than a service road. A cleveland metroparks boat tour is the product of that reversal — a public agency inviting people onto water it once had no jurisdiction over. What the river offers now is a lesson in engineering as much as ecology. The Cuyahoga runs roughly one hundred miles to travel thirty as the crow flies, and its final crooked mile through the Flats is spanned by bridges of nearly every type American industry produced: vertical lifts, jackknife bascules, a swing span, and the steel arch of the Detroit-Superior viaduct with its abandoned streetcar deck below the road. Ore boats a thousand feet long still negotiate those turns with the help of bow thrusters and tugs. Guided cleveland metroparks boat tour tours put a naturalist on the deck to read this landscape aloud — the bald eagles nesting near Scranton Peninsula, the steelhead and walleye returning to water once declared biologically dead, the sediment dredging that keeps the shipping channel open. Departure is from 1785 Merwin Ave, on the east bank where the Flats meet the river bend. Access is close to level, with a single step at the boarding point. Sailings are limited: Tuesday and Thursday, 12:00–14:00, at 21 USD per person, with advance registration required. Cleveland's harbour history is longer than its factories. The city was surveyed in 1796 at the river mouth precisely because the Cuyahoga offered shelter from Lake Erie's short, steep waves. Every warehouse, bulkhead and bridge visible from a Cleveland river cruise sits on that original logic. The cleveland metroparks boat tour tour is, in effect, a reading of the city's founding argument from the water it was built to exploit — and, more recently, to repair.