The 24-mile Three Rivers Heritage Trail is a network of urban nonmotorized paths along the Monongahela River, Allegheny River, and Ohio River, allowing bicyclists, runners, roller-bladers, and walkers to enjoy views of — and access to — neighborhood amenities and attractions surrounding Downtown Pittsburgh and Point State Park.  The Great Allegheny Passage runs co-terminously with the Three Rivers Heritage Trail on Pittsburgh’s South Side, across the Hot Metal Bridge and in much of Downtown Pittsburgh.  The entire system is stewarded by Friends of the Riverfront and is popular for recreation and commuting.