Three Rivers Heritage Trail

More than 1,200 athletes are expected to bike, swim and run around the North Shore this weekend in the 17th annual Pittsburgh Triathlon. This year, organizers are paying special attention to making sure the Allegheny and Ohio Rivers are safe for swimmers.

The event begins Saturday at 6:45 a.m. with a sprint race, which features shorter distances than traditional triathlons. There will also be an “Adventure Race,” in which competitors will substitute canoeing or kayaking for the swim portion of the triathlon. The classic triathlon will take place Sunday.

Plans have been approved to expand the Three Rivers Heritage Trail along a mile of the riverfront.

The expansion will run from Aspinwall Riverfront Park to Blawnox Community Park. The corridor has been eyed for years as an ideal location for a trail, but it runs in front of the Pittsburgh Water and Sewer Authority plant, and conversations with previous city administrations left planners thinking they’d have to route the trail along Freeport Road.