A gentle drop in a creek, smooth water above and calm water below: it looks like a perfect spot for a lazy summer float. But low-head dams like the ones in Tyler State Park in Pennsylvania are among the most hazardous structures paddlers and waders can meet, and many visitors don't recognize the danger. Here is how they work, why they are so deadly, and how to stay … [Read more...] about This is one of America’s most dangerous state parks — and you’ll never guess why